Category Archives: Preserve Infrastructure

State Street Resurfacing Near Downtown Salt Lake City

Aerial photo of State Street looking north toward Salt Lake CityEarlier this summer, Region Two completed one of this year’s Top 10 Construction Projects – right in the middle of Salt Lake City. Construction crews from Staker Parson Companies and its subcontractors resurfaced a four mile stretch of State Street between 400 South and 3000 South – spanning both Salt Lake and South Salt Lake cities. Crews replaced old asphalt with a one inch Open Graded Surface Course (OGSC), rebuilt 141 pedestrian ramps and 23 medians, and upgraded traffic signals at 12 intersections. The $4 million project started in late April and was successfully completed in late July.

This section of State Street was last resurfaced in 2004. The roadway was starting to form potholes, and concrete medians were reaching the end of their design life. These factors indicated to UDOT that a preservation project was needed. The new pavement surface is expected to last eight to ten years and the concrete work including the new pedestrian ramps and medians is expected to last 30 to 40 years.

With work taking place on a seven-lane arterial in a central business district, the State Street resurfacing project presented several construction challenges. Cars consistently parked in the work zone near downtown Salt Lake City, which required extra signage to control. The old utilities in South Salt Lake were fragile to work around, and the unusually rainy July caused minor schedule changes. The Region Two crew and contractor team worked together to successfully complete work on time in spite of these challenges.

Aerial photo of State Street looking southTo minimize impacts to drivers and businesses, most of the work on the project was scheduled during overnight hours. The project team coordinated closely with local business owners and residents throughout construction to keep them apprised of upcoming access and parking restrictions, overnight work, and other potential impacts. The public involvement team distributed fliers, answered hotline calls and responded to emails to address concerns and respond to questions.

In addition to businesses and residents, key project stakeholders included Salt Lake City, South Salt Lake City, UTA, Intermountain Harley Davidson, the Utah Pride Festival (UPF) and the Utah Arts Festival (UAF). During the project, Intermountain Harley Davidson attracted a few thousand motorcyclists to a series of events, such as the MDA Rock & Roll Ride and the Demo Days Ride; UPF attracted over 20,000 attendees, and UAP attracted over 80,000 attendees. Special efforts were made to modify the construction schedule to accommodate these festivals and other events. This coordination helped promote a safe and accessible festival experience.

The project received media attention at the beginning of construction. Fox 13 wrote a story that highlighted the type of work taking place on the State Street. As part of the story, Resident Engineer Bryan Chamberlain and Wild Mushroom Pizza owner James Zuiter were both interviewed. Chamberlain emphasized how crews worked at night to get the most done while impacting the fewest people, and Zuiter confirmed that despite the short-term inconvenience, business owners appreciate a freshly surfaced road.

The State Street project was accomplished on time, within budget, and with minimal inconvenience to the public. The newly-resurfaced road, reconstructed medians, and new pedestrian ramps will provide a smoother ride for drivers and enhance safety for pedestrians for years to come.

This guest post was originally published in the Region Two Fall 2014 Newsletter.

Innovative partnerships prove to be the perfect recipe for Patchwork Parkway

PANGUITCH — In a state where innovation is consistently used to Keep Utah Moving, sometimes innovation alone isn’t enough. Unique partnerships between state agencies can be the perfect additional ingredient to accomplish the improbable.

In rural southern Utah, where equipment and manpower are sometimes as few and far between as the towns in the region, innovation and partnering got a much-needed job done quickly and efficiently, while minimizing the use of taxpayer dollars.

Recently, UDOT’s shed 4469 in Panguitch teamed up with Bryce Canyon National Park to create a shoulder on a seven-mile stretch of Scenic Byway SR-143. This stretch of Utah’s “Patchwork Parkway” was in great need of a shoulder, because a simple task like plowing the road or pulling over created potential safety issues.

The project required tools neither the department nor the national park possessed alone. So to combat this issue, they came together to pool resources and manpower to finish the job in a few days, saving each agency valuable time and money.

“The stars just lined up,” said Panguitch Shed manager Robert Brown. “Down here, we’re all neighbors, and you have to get creative to help each other out and get things done.”

Normally, a similar project requires a team of at least six to eight workers, with three on a shouldering machine alone. But with only two full-time employees at the shed, Brown and his counterpart at Bryce Canyon had to think outside of the box. Here are some of the highlights:

• Bryce Canyon provided side delivery dump trucks that offered a more efficient use of asphalt. Standard machines provide four feet of material, even if only two feet are needed.
• UDOT’s grader was used to accomplish both the grading and compaction tasks, as the shoulder in the area is too steep to use conventional steel drum rollers.
• The asphalt used on the project was recycled and obtained from a pit in nearby Hatch, Utah at nearly one-third of the cost of new asphalt.
• The project was completed in two days, with two UDOT Panguitch Shed employees and two Bryce Canyon employees.
• A pull-behind broom hooked to a pickup truck cleaned the road with two passes.

For Brown, the lesson is simple: when government entities work and plan together, the result can be a win-win for both, as well as the surrounding communities.

“Without the shared resources, we wouldn’t have been able to do the job,” Brown said. “I think this shows that governments need to think outside of the box more to collaborate.”

THREE YEARS OF PLANNED PROJECTS

A new UPLAN gallery of web maps and apps, with information about upcoming projects, is now available through UPlan.

The gallery makes data on the UDOT Three Year Plan available to project managers, UDOT employees, policy makers and the general public. Projects are organized by program funding source, year and UDOT region. The gallery also has a web map of future planning through 2020.

The live data advantage

The online information can be referenced by employees across the department, or by UDOT and local governments to assure that all are viewing and using the correct information. The project data is updated nightly, so data is kept as current as possible.

Having dynamic, easily accessible information via the gallery enhances collaboration across UDOT divisions so projects can be synchronized to use resources effectively and reduce impact to the public. The gallery improves agency transparency since anyone with a web connection can use the gallery to view planned projects.

What is UDOT’s Three Year Plan?

Screen Shot of the Three Year Plan WebsiteThe projects in the Three Year Plan have been identified and prioritized by each of the four UDOT regions. The projects address UDOT’s three strategic goals, Zero Crashes, Injuries and Fatalities, Optimize Mobility, and Preserve Infrastructure.  Funding sources have also been identified for each project.

The main advantage for UDOT in having a three year program of road construction projects is coordination, says William Lawrence, Director of UDOT Program Finance. The plan lets the department evaluate the program as a whole and “helps maximize efficiency,” he says. For example, two projects in close proximity in American Fork, each planned for different years, were recently combined into one project that will take place in 2017. In this case, combining projects is a better use of financial resources, and “construction will only impact the public once,” says Lawrence.

To find the Three Year Plan gallery, access the UDOT Data Portal at data.utah.gov, click the UPLAN thumbnail, then click the 3-Year Plan thumbnail in UPLAN. Instructions for searching for or sorting projects are included in the gallery.

UDOT Participated in MAG Transportation Fairs

MAG Transportation FairMountainland Association of Governments held its annual Transportation and Community Planning Fairs during October.

MAG invited member cities to provide information about community plans and utilized the fairs to invite public input on the Draft Regional Transportation Plan.

UDOT participated by providing information about upcoming construction on The Point project, seat belt safety highlighted by the Zero Fatalities team, and TravelWise information. Region Three displayed their Interactive Projects map and a looping video using photos from the 2014 photo contest. They also shared information about the region bike plan and invited response to a quick questionnaire to help prioritize potential bike projects.

MAG is launching an interactive website called Exchanging Ideas as part of the Regional Transportation Planning process. Kory Iman, GIS Analyst with Region Three and MAG, had an integral role in developing the site to facilitate public input. MAG staff demonstrated the site at the three fairs in October and will accept comment through April 2015.

This guest post was orginally published in the Region Three Fall 2014 Newsletter.

Vision and Mission announced at UDOT Annual Conference

If all roads led to Rome at the height of the Roman Empire, all roads in Utah lead to elevated economic prosperity and a higher quality of life in our state today.

This theme was prevalent throughout the Utah Department of Transportation’s Annual Conference. UDOT announced a new vision, mission statement, logo, and changes to its strategic goals during the conference—all aimed at improving Utah and keeping people safe.

Carlos Braceras speaks during the 2014 UDOT Annual Conference

Carlos Braceras speaks during the 2014 UDOT Annual Conference

On Tuesday, Oct. 28, Executive Director Carlos Braceras announced UDOT’s vision is “Keeping Utah Moving.” This simple statement is a powerful reminder of the department’s purpose and the goal employees, consultants, and contractors should be working toward every day.

“With our growing population and changing demographics, we need to keep our state moving,” Braceras said. “Whether it’s building new roads, repairing old ones, taking phone calls or holding meetings, it’s all aimed at Keeping Utah Moving.”

Innovating transportation solutions to strengthen Utah’s economy and enhance quality of life. 

Braceras explained that the department has based its direction and performance for years on Strategic Goals (Preserve Infrastructure, Optimize Mobility, Zero Fatalities, Strengthen the Economy); however, until this year it hasn’t had a vision or a mission statement.

As Utah looks ahead to a rapidly growing population, expected to almost double in the next 35 years, the entire state must begin anticipating solutions for Utah’s infrastructure and economy. Change can either be a problem or an opportunity. Braceras argues that for Utah, it’s an opportunity to reinforce Utah’s position as one of the country’s best places to live.

“Quality of life is the essence of what makes living in Utah so attractive,” Braceras said. “I’ve made Utah home for 34 years because I can buy a house, get a job, and enjoy the outdoors I love. That, combined with the strong state economy, is what will keep me here the rest of my life.”

Braceras, who’s been a career-long champion of safety, also announced moving Zero Fatalities to the department’s top strategic goal, but with a twist.

“Nothing that we do is more important than safety. Zero is our number one goal. Zero fatalities. Zero crashes. Zero injuries,” Braceras said.

While UDOT will continue aggressively educating drivers on habits that will decrease the amount of fatalities on Utah’s roads, focus will also be on keeping everybody within UDOT safe as well. That goes for accountants as much as it does construction workers, he said.

Deputy Director Shane Marshall announced one final change to UDOT’s direction: the emphasis area of Operational Excellence has been eliminated, reducing the number of emphasis areas from six to five (Integrated Transportation, Collaboration, Education, Transparency, Quality).

UDOT logo

Marshall explained, “The motivating forces behind the emphasis areas of both Quality and Operational Excellence were very similar. Both areas focus on a value we all share very strongly: the desire to be good stewards of taxpayer money.

If you define part of our Quality emphasis area as “Continued Process Improvement,” then Operational Excellence can fit right into Quality.”

The updated vision, mission, emphasis areas, strategic goals and core values are available on UDOT’s new web app. This tool was unveiled at the UDOT Annual Conference, and Braceras explained there are plans to expand its functionality in the future.

For now, the web app is a helpful resource for reference as employees, consultants, contractors and partners work together in their efforts to Keep Utah Moving.

I-80 Silver Creek Reconstruction

Photo of concrete pavingDrivers traveling through Summit County on I-80 have become familiar with one of the Region’s largest construction projects: the concrete reconstruction of I-80 from the U.S. 40 junction (MP 148) to Wanship (MP 155). Work began in June and is scheduled to continue through November of 2015 (construction will be halted during the winter months between 2014 and 2015).

The project includes replacing the freeway’s asphalt with new concrete pavement. In many locations, the existing asphalt will be removed and the pavement will be completely reconstructed. The new concrete will help accommodate the heavy trucks that travel in both directions along this key freight corridor and will prolong the life of the roadway.

UDOT’s contractor, Geneva Rock, is constructing the road in two principal phases. Phase one – the current phase – has shifted all traffic to the westbound lanes, allowing crews to reconstruct the eastbound lanes. In November, once the eastbound lanes are complete, lane restrictions will be lifted and traffic will be returned to its normal configuration. In the spring, crews will shift all traffic into the newly reconstructed eastbound lanes and complete work in the westbound lanes.

Photo of concrete pavingAs part of the concrete reconstruction, a unique pavement base material is being used to provide strength and stability to the pavement. The material, called Cement-Treated Asphalt Base (CTAB), provides a strong and stable base for the concrete to ensure durability and longevity. The CTAB material is formed by pulverizing the existing asphalt and adding cement powder and water to make a low strength concrete.

Typically, concrete pavement is either overlaid over the existing asphalt (as with the concrete paving project on S.R. 201), or a thin layer of asphalt is applied to the existing pavement and then the concrete is overlaid. On this section of I-80, however, the existing pavement is deteriorating too quickly to provide a suitable base. Instead of overlaying an additional layer of asphalt, CTAB was selected because of its lower cost and better resistance to water damage. While concrete treated bases have been used for a long time, this is the first instance in Utah where a cement treated base uses 100 percent recycled asphalt.

The project team has been involved in an extensive stakeholder outreach and public information program. Key stakeholders, such as Summit County, local emergency services, and the communities of Tollgate and Promontory, have been kept informed and consulted throughout the project to minimize impacts wherever possible and coordinate essential information such as emergency plans.

Photo of concrete pavingUDOT and Geneva Rock have worked together to address stakeholder concerns and mitigate risks associated with this traffic configuration. Local emergency crews are allowed to access the work zone in the event that they are not able to travel through open traffic lanes in a timely manner. Tow trucks are on-call at both ends of the construction zone to reduce response times to incidents and keep traffic moving.

Due to the long-term closure of Tollgate’s eastbound on- and off-ramps, accommodations needed to be made to provide residents access to their community, especially in case of emergency. The project team worked with the neighboring Promontory development to allow Tollgate residents to use of Promontory’s private access roads in order to bypass I-80 as they travel to and from Park City.

UDOT, Geneva Rock, and the local stakeholders have established a good working relationship for this significant reconstruction – a project that will ensure this section of I-80 stays in good repair for years to come.

This guest post was originally published in the Region Two Fall 2014 Newsletter.

Comparison of Wintertime Asphalt and Concrete Pavement Surface Temperatures in Utah

Because winter maintenance is so costly, UDOT personnel asked researchers at Brigham Young University (BYU) to determine whether asphalt or concrete pavements require more winter maintenance. Differing thermal properties suggest that, for the same environmental conditions, asphalt and concrete pavements will have different temperature profiles. Climatological data from 22 environmental sensor stations (ESSs) near asphalt roads and nine ESSs near concrete roads were used to determine which pavement type has higher surface temperatures in winter.

Twelve continuous months of climatological data were acquired from the road weather information system operated by UDOT, and erroneous data were removed from the data set. In order to focus on the cold-weather pavement surface temperatures, a winter season was defined as the period from November through April, and the data were divided into time periods that were based on sunrise and sunset times to match the solar cycle.

To predict pavement surface temperature, a multiple linear regression was performed with input parameters of pavement type, time period, and air temperature. As shown in Table 1, the statistical analysis predicting pavement surface temperatures showed that, for near-freezing conditions, asphalt is better in the afternoon, and concrete is better for other times of the day. However, neither pavement type is better, on average, across the locations studied in this research. That is, asphalt and concrete are equally likely to collect snow or ice on their surfaces, and both pavements are expected to require equal amounts of winter maintenance, on average.

To supplement these analyses, which provided useful information about average pavement temperatures across the statewide pavement network, additional analyses of asphalt and concrete pavement surface temperatures were performed for a particular location in a mountainous region of northern Utah more typical of canyon areas. Asphalt and concrete pavement surface temperatures were directly compared at a location on U.S. Route 40 near Heber where asphalt and concrete meet end to end at the base of a mountain pass. As shown in Figure 1, an ESS was installed to facilitate monitoring of asphalt and concrete pavement surface temperatures, as well as selected climatic variables, at the site.

Data collected during the three winter seasons from 2009 to 2012 were analyzed in this research, and the same months and time periods used in the previous study were applied in this analysis as well. To compare the surface temperatures of the concrete and asphalt pavements during freezing conditions, multivariate regression analyses were performed. Equations were generated for three response variables, including the asphalt surface temperature, concrete surface temperature, and difference in temperatures between the asphalt and concrete surfaces.

The statistical models developed in the analyses show that the surface temperature of both asphalt and concrete pavement increases with increasing air temperature and decreases with increasing relative humidity and wind speed, and that the difference in pavement temperatures decreases with decreasing air temperature. For the studied site, the data indicate that concrete pavement will experience freezing before asphalt pavement for all time periods except late afternoon, when the pavement types are predicted to freeze at the same air temperature (see Table 2). Therefore, for material properties and environmental conditions similar to those evaluated at this U.S. 40 site, asphalt would require less winter maintenance, on average, than concrete.

Due to the interactions among albedo, specific heat, and thermal conductivity, the actual thermal behavior of a given pavement will depend on the material properties and environmental conditions specific to the site. As shown in this research, concrete pavement can be warmer than asphalt, which is typical of the statewide pavement network, on average, during late morning, evening, night, and early morning. However, the research also clearly shows that, in mountainous regions of northern Utah more typical of canyon areas, engineers may expect asphalt pavement to be warmer than concrete, or equal in temperature to it, during all time periods at sites that receive direct sun exposure, such as the one on U.S. Route 40 that was studied in this research. At such sites, selection of asphalt pavement may facilitate reduced winter maintenance costs; however, though statistically significant, relatively small differences in temperature between asphalt and concrete pavement surfaces may not warrant differences in actual winter maintenance practices. Other factors beyond pavement type, such as rutting and surface texture, may more strongly affect winter maintenance and should also be considered.

The results of the statewide comparison of wintertime temperatures of asphalt and concrete pavements, as well as the specific results for the U.S. 40 site near Heber, are detailed in two separate research reports available on the Research Division website.

This guest post was written by W. Spencer Guthrie, Ph.D., M.ASCE, Brigham Young University, and David Stevens, P.E., Research Program Manager, and was originally published in the Research Newsletter.

I-15 Payson to Spanish Fork Project Wins Award

Photo of I-15 near Payson

This capacity project added a lane and shoulder in each direction

The I-15 Payson to Spanish Fork project was one of the largest construction projects in Region Three in 2013.

The ambitious $22 million, 6.5 mile design-build project recently received the “2014 Excellence in Concrete Award” in the category of Structures: Public Works for the concrete work on the bridges.

The project was fast-paced, with 7 months to widen 8 structures and extend pavement into the existing median for an extra lane and wider inside shoulder.

In addition to being widened, the existing bridge substructures were repaired to increase service life. The project also included constructing two miles of precast concrete post and panel noise walls on the east side of I-15 through Payson.

The I-15 Payson to Spanish Fork project improved a vital connection between the north and south half of the state for both commuters and the movement of goods and services. The rapid pace of the project and public coordination created little impact or inconvenience to the traveling public.

See UDOT in 3D

UDOT is moving to an all-3D environment which includes greater use of available design capabilities and an eventual move to a full 3D project workflow.

photo of the Virgin River Arch Bridge.

A photo-realistic image: UDOT built a new bridge over the Virgin River on S.R. 9 near Hurricane to accommodate increased traffic volume. This rendered image shows the new bridge superimposed over the existing bridge, which remains in use.

Embracing a 3D workflow environment will produce some important advantages, including the use of models that can be viewed from all angles in order to assess constructability, utility clash detection models that show a full representation of underground utilities, and animations that can show the built project along with expected traffic flow.

3D models, animations and illustrations can help bridge the communication gaps that sometimes occur among specialties at UDOT, or between the agency and stakeholder groups, since complex engineering data is more easily understood when presented in 3D.

For UDOT designers, the move to 3D represents “a fine tuning of the way we design,” says Bob Peterson, UDOT Methods Engineer. “We’ll be taking our 3D design to a full completion instead of just doing a paper copy as the final output.”

A full 3D workflow

Moving to a full 3D workflow means that projects will be modeled and provided to contractors as a 3D engineered model at advertising, and contractors will return an as-built 3D model that accurately represents project outcome.

Designers at UDOT have been working in 3D for about 20 years. Currently, when projects are advertised, 2D plan sets are made available to all bidding contractors. During the advertising time frame, contractors take those 2D sets and may create their own 3D model. Once the project is awarded, the winning contractor will typically finish a 3D model or hand-enter information for Automated Machine Guidance.

Getting as-built 3D models will represent a big efficiency boost to UDOT. “Once we get to the point where we know exactly what the existing condition is, then the designers don’t have to start from scratch anymore,” explains George Lukes, Standards Design Engineer.

Challenges and strengths

Lukes is overseeing the effort to move to a full 3D workflow. He sees challenges ahead, but recognizes that UDOT has some advantages as an agency, including working with a willing and capable consulting and contracting community.

“The big deal is advertising the project with the model as the legal document,” says Lukes. “Right now the legal documents are our plan sheets, the paper copies – legally that’s what the contractor has to follow. It’s a huge challenge to give the model to the contractor and say ‘this now is the legal document,’ but I think our contractors and consultants are very willing to sit down and figure a way to make that work.”

UDOT Region Four will take on the initial challenge of delivering a 3D model as an advertising package for three projects. All three projects will use CMGC, an innovative contracting method that allows close collaboration between UDOT and a contractor in the preconstruction phase.

Collaboration with the contractor during design will help UDOT minimize risks encountered when building the project “because they know the construction risks better than we do,” says Lukes. “It’s going to give us information that we need, the contractor will be on board with us while we do it, and hopefully we’ll get a lot of good lessons learned from that too.”

Fully embracing 3D capabilities will produce comprehensive planning, construction and design solutions that will benefit UDOT and all contract partners and road users. UDOT will learn how to better minimize risk. Bidding contractors will realize a big efficiency by not having to create baseline models from scratch. The winning contractor will also have UDOT’s model to modify for construction and 3D as-builts will make subsequent design processes more efficient. The outcome will be better roads and a more efficient use of transportation funding.

For more:

See FAQs with a timeline for implementing 3D, presentations, and more at udot.utah.gov/go/3-d

Bentley software training for UDOT employees is offered regularly. For more information, contact Bob Peterson at 801-965-4041 or bobpeterson@utah.gov

Also check out this flyer.

Grouted Splice Sleeve Connectors for ABC Bridge Joints in High-Seismic Regions

Photos and diagram of different kinds of GSS connectors

Figure 1. Two types of GSS connectors used: (a) FGSS, (b) GGSS, (c) FGSS-1, (d) GGSS-1

In recent years, the Accelerated Bridge Construction (ABC) method has received attention in regions of moderate-to-high seismicity. Prefabrication of bridge structural components is a highly effective method in this process and one of the ABC methods for Prefabricated Bridge Elements and Systems (PBES) advanced by the Federal Highway Administration. Joints between such precast concrete components play an important role in the overall seismic performance of bridges constructed with the ABC method. Research has been carried out at the University of Utah to investigate potential ABC joint details for bridges located in high-seismic regions. A connector type, referred to as a Grouted Splice Sleeve (GSS), is studied for column-to-footing and column-to-cap beam joints. Two GSS connectors commonly used in buildings were utilized in this study, as shown in Fig. 1. The column-to-cap beam joints used a GSS connector where one bar was threaded into one end and the other bar was grouted into the opposite end (denoted as FGSS), as shown in Fig. 1(a) and Fig. 1(c). The column-to-footing joints incorporated another type of GSS where the bars were grouted at both ends (denoted as GGSS), as shown in Fig. 1(b) and Fig. 1(d).

Drawings of the test specimen alternatives

Figure 2. Configuration of test specimen alternatives

Three precast alternatives in addition to one conventional cast-in-place half-scale model were constructed for each category, as shown in Fig. 2; the column-to-cap beam joints were tested upside down. The GSS connectors were placed in the column base (GGSS-1) or column top (FGSS-1) in the first alternative. The location of the GSS connectors changed to the top of the footing (GGSS-2) and bottom of the cap beam (FGSS-2) to study the performance of the joints when the GSS connectors were outside the plastic hinge zone of the column in the second alternative. The dowel bars in the footing and the cap beam were debonded over a length equal to eight times the rebar diameter (8db) for the third alternative in both categories, while the GSS connectors were embedded in the column base (GGSS-3) or column top (FGSS-3). The last specimen type was the cast-in-place joint, in which continuous bars from the footing and cap beam were used to build the columns with-out bar splices (GGSS-CIP and FGSS-CIP).

Photos of the speciment

Figure 3. Specimen GGSS-3 at a drift ration of 7%: (a) overall view; (b) footing dowel at joint interface

Experimental results under cyclic quasi-static loading showed that the performance of all joints was satisfactory in terms of strength and stiffness characteristics. However, the hysteretic performance and displacement ductility capacity of the specimens were distinct. Improved seismic response was observed when the GSS connectors were located inside the footing (GGSS-2) and the cap beam (FGSS-2) rather than the corresponding column end. The debonded rebar zone enhanced the ductility level and the hysteretic performance of the joints. This technique was found to be highly effective for the column-to-footing joint (GGSS-3), as shown in Fig. 3. As expected, the cast-in-place joints performed the best.

Even though AASHTO Specifications currently do not allow the use of connectors in the plastic hinge region, all joints tested in this research demonstrated acceptable ductility for moderate-seismic regions and some joints demonstrated acceptable ductility for high-seismic regions. The GSS connectors studied in this research were promising, especially when considering the time-saving potential of joints constructed using ABC methods; however, the different hysteretic performance and reduced displacement ductility of various alternatives com-pared to the cast-in-place joints must be accounted for in design.

Acknowledgments: This study is described further, including recent reports, on the TPF-5(257) website. The authors acknowledge the financial support of the Utah, New York State and Texas Departments of Transportation, and the Mountain Plains Consortium. The authors also acknowledge the assistance of Joel Parks, Dylan Brown, and Mark Bryant of the University of Utah.

This guest post was written by Chris P. Pantelides, Ph.D., University of Utah, M.J. Ameli, University of Utah, and Jason Richins, S.E., Research Engineering Manager and was originally published in the Research Newsletter