考虑不确定性和方向性的结构随机极值和疲劳风致响应及抗风可靠性评价理论

项目名称： 考虑不确定性和方向性的结构随机极值和疲劳风致响应及抗风可靠性评价理论

项目编号： No.51478401

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑环境与结构工程学科

项目作者： 陈新中

作者单位： 西南交通大学

项目金额： 84万元

中文摘要： 将应用并发展多元极值理论，建立更加合理的根据有限实测数据估算年极值风速与风向的联合概率分布的方法。充分利用风工程学科的最新研究成果，建立评价结构高斯、非高斯风致响应极值和疲劳损伤的概率分布的精细化方法。通过风洞试验，建立合理的非线性气动阻尼模型，并开发计算非线性随机风致振动响应（包括极值和疲劳响应）的解析方法。综合考虑影响结构抗风性能的重要参数的不确定性和方向性，结合极值风速和风向的联合概率分布，开发更为合理且便于实际使用的以概率为基础的结构抗风性能评价及设计理论体系，对结构针对多目标极限抗风性能的系统可靠性进行合理评价。该理论体系将有助于实现不同结构体系在不同极限性能状态情况下的结构可靠度或失效概率的统一，同时实现针对多灾害荷载的结构可靠度或失效概率的协调一致。这种崭新理论体系的建立将对制定更合理的基于结构概率性能设计的规范、并提高大型土木结构的抗风性能以及综合防灾性能具有重大的影响。

中文关键词： 随机风致响应；非高斯响应；极值；疲劳损伤；不确定性

英文摘要： The proposed project will develop advanced approaches for modeling joint probability distribution of directional extreme wind speeds using multi-variant extreme value theory based on limited directional wind speed data. Advanced methods for quantifying extreme value distribution and fatigue damage of Gaussian and non-Gaussian wind load effects will be established. A comprehensive wind tunnel testing program will be carried out to study the aerodynamic damping associated with crosswind response of structures at the vicinity of vortex lock-in wind speed. An analysis framework for calculating stochastic wind-induced multimode coupled response of structures with nonlinear aerodynamic damping will be developed and validated from wind tunnel tests. The proposed project will also establish a new probabilistic framework for assessing risks of wind-excited structures associated with multiple limit state responses. This innovative framework will be able to integrate uncertainty and directionality of wind, aerodynamics and structural characteristics, which cannot be achieved in state-of-the-art approaches. Simplified calculation procedures will be developed for their adoption in future design codes and standards. The new tools and methods developed in this project will help in achieving consistent design of different structural systems with various limit state responses, and consistent structural design against multiple hazards. This project provides useful tools and knowledge for reliability and performance-based design and assessment of structural systems against wind and other multiple hazards, enhancing our ability for building and maintaining resilient and sustainable infrastructure and structural systems.

英文关键词： stochastic wind-induced response;non-Gaussian response;extreme;fatigue damage;uncertainty