Vulnerability of Bridge Piers to Collision by Heavy Vehicles

重型车辆碰撞桥墩的脆弱性

• 批准号: 0334364
• 负责人: Sherif El-Tawil
• 金额: $ 4.45万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0334364&HistoricalAwards=false
• 关键词: Vulnerability; Bridge; Piers; Collision; Heavy

PI: Sherif El-Tawil, University of MichiganThe events of Sept. 11th and the ongoing terror threats highlight the vulnerability of our infrastructure to new and unfamiliar risks. Unprotected bridge piers, in particular, are vulnerable to accidental or malicious collision by heavy vehicles. Many bridges in the national inventory are supported on single column piers or two-column bents (Fig. 1a) and can be rendered useless by an attack on a single column. Local communities and economies dependent on such vulnerable bridges face significant exposure. The intent of this project is to investigate the use of high fidelity numerical modeling for simulating the response of bridge piers subjected to collision by vehicles. Detailed vehicle models will be crashed into bridge pier models with the objective of studying the parameters influencing vehicle versus structure collision. The proposed simulations are expected to lead to a better understanding of the collision process and will lead to quantification of structural demands created by such extreme events. This research addresses a critical topic or immediate national importance: the security of our bridges and their vulnerability to impact by heavy vehicles. The products of this research will promote the development of performance-based design philosophies which incorporate security concerns in the design process. This will ultimately enable civil engineers to rehabilitate existing structures and design new bridges that are more resistant to accidents and terror attacks.

PI：Sherif El-Tawil，马达加斯加大学第11和持续的恐怖威胁突出了我们的基础设施在新的和不熟悉的风险面前的脆弱性。特别是没有保护的桥墩，很容易受到重型车辆的意外或恶意碰撞。在国家清单中，许多桥梁都是由单柱桥墩或双柱排架支撑的（图1a），如果单柱受到攻击，这些桥梁可能会变得毫无用处。 依赖这些脆弱桥梁的当地社区和经济面临重大风险。本计画的目的是探讨使用高保真度数值模拟来模拟桥墩在车辆碰撞下的反应。 详细的车辆模型将碰撞到桥墩模型，目的是研究影响车辆与结构碰撞的参数。 拟议的模拟预计将导致更好地了解碰撞过程，并将导致量化的结构需求所造成的这种极端事件。这项研究解决了一个关键的话题或直接的国家重要性：我们的桥梁的安全性和它们对重型车辆影响的脆弱性。本研究的产品将促进基于性能的设计理念，将安全问题的设计过程中的发展。 这将最终使土木工程师能够修复现有结构，并设计出更能抵御事故和恐怖袭击的新桥梁。