Service Life Design Guidance For UHPC Link Slabs
| 项目名称： | Service Life Design Guidance For UHPC Link Slabs |
| 摘要： | Design for service life rather than just for strength against potential overload and fatigue failure is becoming a more common consideration for bridges. One aspect of design, and often bridge retrofit, with potential for a large impact is minimizing the number of transverse deck joints. Bridge deterioration can often be traced to poor performance of these deck joints due to failure of the joint seal allowing chloride laden water onto bridge girder ends, bearings, and substructure elements. Using link slabs over the piers allows for eliminating some interior joints and moving expansion joints to the end of the bridge while still maintaining typical bridge behavior. Link slabs allow the simply supported behavior expected for many bridges, yet still transmit deformations and forces to expansion joints and reduce potential penetrations in the bridge deck. Advanced materials, such as ultra-high performance concrete (UHPC) can simplify link slab details and substantially improve their durability. UHPC link slabs are specifically relevant to accelerating bridge retrofit in that the short required debonded lengths can significantly reduce the required amount of demolition and the overall time required for the project. Debonded lengths for UHPC link slabs can be as small as 16 in. compared to several feet for conventional construction. While the concrete in the immediate area of the joint may be deteriorated and can be removed quickly, concrete further from the joint will often be sound and take substantial time and labor to remove. The hairline distributed cracks that form in a UHPC link slab limit pathways for water to penetrate to the bridge girders and substructure, and UHPC itself is inherently more durable than conventional concrete due to its very low permeability. UHPC link slabs have been used successfully in the field by several state DOTs, several research studies have been carried out focused on link slabs, and appropriate design guidelines are available in the AASHTO LRFD Guide Specifications for Accelerated Bridge Construction (2018). However, more information is needed for quantifying the service life benefits of using UHPC link slabs compared to conventional construction. The main objectives of this project are to develop user friendly tools that will allow use of developed information specific to UHPC link slabs within the framework of SHRP2 R19A for service life design of bridges and to provide educational materials to help practitioners understand how to use those tools. |
| 状态： | Active |
| 资金： | 75,000 |
| 资助组织： | Accelerated Bridge Construction University Transportation Center (ABC-UTC)<==>Office of the Assistant Secretary for Research and Technology |
| 项目负责人： | Floyd, Royce W |
| 执行机构： | Southern Plains Transportation Center |
| 开始时间： | 20200101 |
| 预计完成日期： | 20201231 |
| 主题领域： | Bridges and other structures；Construction；Design；Highways |
相关文献
- SPR-4223: Link-Slabs Details and Materials
- Concrete Mix Designs for Partial-Depth Link Slabs and Deck Extension
- Evaluation of the Use of Link Slabs in Bridge Projects, TR-701
- UHPC Decked I-Beam for Accelerated Bridge Construction
- Utilizing a Particle Packing Approach for an Illinois-specific, Nonproprietary, Low-Shrinkage UHPC
- Structural Testing of Field-Cast UHPC Connections between Precast Bridge Deck Level Elements
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