Synthesis of Information Related to Highway Practices. Topic 53-13. Practices for Steel Bridge Fabrication and Erection Tolerances
| 项目名称： | Synthesis of Information Related to Highway Practices. Topic 53-13. Practices for Steel Bridge Fabrication and Erection Tolerances |
| 摘要： | Research on tolerances for prefabricated elements used in accelerated bridge construction was completed under NCHRP Project 12-98: “Recommended Guidelines for Prefabricated Bridge Elements and Systems Tolerances and Dynamic Effects of Bridge Moves”. The majority of the work covered precast concrete elements for bridges such as decks, substructure elements, and wall elements. Typical steel bridge elements were not covered because the majority of prefabri-cated elements used to date have been precast concrete. NCHRP Project 12-98 also did not in-clude traditional prefabricated elements such as steel and concrete girders, since there are already specifications for tolerances for these elements NCHRP Project 12-98 research found that large tolerances cause problems with member connections. In precast concrete, large element tolerances require large joints in order to accommodate the tolerances. The AASHTO/National Steel Bridge Alliance Steel Bridge Collaboration group has noted that the use of oversize holes can lead to loss of overall structure geometry and fit-up problems during erection. Tolerances in steel fabrication require special processes such as shop blocking beams to drill field splices to ensure proper fit-up. Some state departments of transportation (DOTs) require full shop erection and fit-up to resolve tolerance issues in connections. The purpose of this proposed synthesis is to document current state DOT practices of tolerance management for steel bridge elements. |
| 状态： | Proposed |
| 资金： | 45000 |
| 资助组织： | National Cooperative Highway Research Program (NCHRP) Synthesis<==>American Association of State Highway and Transportation Officials (AASHTO)<==>Federal Highway Administration |
| 项目负责人： | Gause, Jo Allen |
| 开始时间： | 20210430 |
| 主题领域： | Bridges and other structures；Design；Highways；Materials |
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