Structural design issues for integral abutment bridges

整体桥台的结构设计问题

• 批准号: 217083-2008
• 负责人: Sennah, Khaled
• 金额: $ 1.53万
• 依托单位: Ryerson University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=393106
• 关键词: Structural; design; issues; integral; abutment

Traditional bridge design makes use of expansion joints in conjunction with expansion bearings to accommodate superstructure movements. However, leaking expansion joints and frozen bearings are major maintenance issues. As a result, considerable interest in integral abutment (jointless) bridges has increased in Canada and USA in the past few decades. A literature search indicates that there are very limited research studies on the economical design and evaluation of the superstructure of integral bridges when subject to environmental and truck loading condition. As such, the aim of the proposed research is to contribute to the efficient design of integral bridges by developing experimentally calibrated, computer based, analytical models capable of predicting accurately their response when subjected to construction, service, and ultimate loading conditions as well as seismic excitations. It is expected that the proposed research will provide data for the design and evaluation of integral bridges in the Canadian Highway Bridge Design Code. Specifically, the results will lead to: (i) valuable information to advance the state-of-the-art of the structural behavior of integral abutment bridges and enrich CHBDC Chapter 5 on Analysis of Bridge Superstructure; (ii) increasing awareness on some important issues that arise during construction, as well as repair, of these bridges, leading to significant cost savings; and (iii) reliable simplified evaluation method to existing integral bridges under ultimate load condition since a small increase in strength for live load can make the difference between closing a bridge and leaving it open. This research project will train young engineers to gain a thorough understanding of this complex bridge system, and after some practical experience, will be able to contribute to Canadian Transportation infrastructure.

传统的桥梁设计使用伸缩缝和伸缩支座来适应上部结构的移动。然而，泄漏的膨胀节和冻结的轴承是主要的维护问题。因此，在过去的几十年里，加拿大和美国对整体桥台（无缝）桥梁的兴趣越来越大。文献检索表明，在环境和卡车荷载条件下，对整体桥梁上部结构的经济设计和评估的研究非常有限。因此，拟议的研究的目的是通过开发实验校准，基于计算机的分析模型，能够准确预测其响应时，受到施工，服务和极限荷载条件以及地震激励的整体桥梁的有效设计。预计该研究将为加拿大公路桥梁设计规范中的整体桥梁设计和评估提供数据。具体而言，研究结果将导致：（i）有价值的信息，以推进整体式桥台桥梁结构行为的最新发展水平，并丰富CHBDC第5章桥梁上部结构分析;（ii）提高对这些桥梁施工和维修过程中出现的一些重要问题的认识，从而显著节省成本;以及（iii）可靠的简化评估方法，以现有的整体桥梁在极限荷载条件下，因为一个小的增加强度的活荷载可以使关闭桥梁和让它开放之间的差异。这个研究项目将培养年轻的工程师，以获得这个复杂的桥梁系统的透彻理解，并经过一些实际经验，将能够为加拿大的交通基础设施作出贡献。