Assessing Bridge Performance to Extreme Winds with Consideration of Non-Gaussian Features and System Uncertainties

考虑非高斯特征和系统不确定性评估桥梁在极端风下的性能

• 批准号: 0824748
• 负责人: Xinzhong Chen
• 金额: $ 14.99万
• 依托单位: Texas Tech University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0824748&HistoricalAwards=false
• 关键词: Assessing; Bridge; Performance; Extreme; Winds

The research objective of this project is to develop advanced methods for performance assessment and reliability-based risk consistent designs of long span bridges subjected to damaging winds. The research will define improved wind force models, which reduce the complexity of current linear force model but adequately describe the nonlinear unsteady force characteristics. The modeling and simulations of stochastic non-Gaussian wind loads that associated with complex urban and mountainous terrains will be considered to examine their effects on bridge structures. To validate and refine the proposed analysis frameworks, wind tunnel testing data and full-scale monitoring of bridge responses to strong winds will be utilized. The field data will be provided by international collaborators. The project deliverables include a new wind load effects model, approach for modeling of parameter uncertainties, a methodology for assessing uncertainty of bridge response, analysis tools for the design of wind-excited bridges, documentation and dissemination of research results, and engineering student education and training. This project will have broad impacts on the design of flexible bridge structures against damaging winds. The research findings will contribute to narrowing the gap between predictions and actual bridge response, and enhance our ability to design safe and economical bridges against damaging winds. The project will greatly help in synthesizing wind load criteria to develop national wind resistant design guidelines for the design of flexible bridge structures. It will involve under represented groups of students, enrich the wind engineering education at both graduate and undergraduate levels, and further strengthen the newly established multidisciplinary wind science and engineering Ph. D program at Texas Tech University.

本计画的研究目的是发展先进的风荷载作用下大跨度桥梁的性能评估与可靠度风险相容设计方法。本研究将定义改良的风力模型，降低目前线性风力模型的复杂度，但能充分描述非线性非定常风力特性。针对城市和山区复杂地形下的随机非高斯风荷载进行建模和仿真，研究其对桥梁结构的影响。为了验证和完善拟议的分析框架，将利用风洞试验数据和桥梁对强风反应的全尺寸监测。实地数据将由国际合作者提供。该项目的成果包括一个新的风荷载效应模型，参数不确定性建模方法，桥梁响应不确定性评估方法，风激桥梁设计分析工具，研究成果的文档和传播，以及工程专业学生的教育和培训。 该项目将对柔性桥梁结构的设计产生广泛的影响，以抵御破坏性的风。 研究结果将有助于缩小预测和实际桥梁响应之间的差距，并提高我们设计安全和经济的桥梁抵御破坏性风的能力。该项目将大大有助于综合风荷载标准，以制定柔性桥梁结构设计的国家抗风设计指南。 它将涉及未被代表的学生群体，丰富研究生和本科阶段的风工程教育，并进一步加强德克萨斯理工大学新成立的多学科风科学与工程博士课程。