基于概率有限元技术的斜拉桥静风失效风险评估  

Risk Assessment of Static Wind Failure for Cable-stayed Bridge Based on Probability Finite Element Technology

作　　者：张玥[1] 周敉[2] 杜胜兵[2] 

机构地区：[1]西安科技大学建筑与土木工程学院,西安市710054 [2]长安大学桥梁与隧道陕西省重点实验室,西安市710064

出　　处：《公路》2015年第1期56-61,共6页Highway

基　　金：陕西省自然科学基础研究计划项目;项目编号2013JQ7031;陕西省教育厅科研计划项目;项目编号11JK0894

摘　　要：针对斜拉桥最大悬臂施工状态对风荷载敏感这一问题,结合某斜拉桥实际工程,基于ANSYS的概率设计系统,提出了将ANSYS有限元的分析功能与求解可靠度的蒙特卡洛法相结合的风致结构失效评估方法。用APDL参数化语言编写ANSYS命令,建立了最大悬臂状态的ANSYS有限元模型。根据规范给出的风速统计规律和前人的研究得到了风速的Weibull分布,以风速的Weibull分布为输入参数,采用超拉丁抽样方法,利用自行开发的斜拉桥静风失效概率分析系统进行了3 000次的仿真循环获得了静风失效概率。The paper is aiming at the problem that maximum cantilever construction state of cablestayed bridge is sensitive to wind load, and combining a real project engineering, based on the ANSYS probability design system-PDS, the static wind-induced structural risk assessment method which includes the Ansys finite element analysis capabilities and reliability of the Monte Carlo is put forward. APDL is used to write command with the software of ANSYS, and the finite element model of the biggest cantilever state is established. According to the statistical rule of wind speed given by the specification and the predecessors＇ research, Weibull distribution of wind speed is obtained. With Weibull distribution of wind speed as input parameters, the use of super Latin sampling method, using self-developed static wind failure probability analysis system for cable-stayed to carry on simulation 3000 times, failure probability induced by static wind is worked out.

关 键 词：斜拉桥 ANSYS概率设计系统 静风 蒙特卡洛法 风险评估 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]