动力敏感性结构风荷载全阶概率分析方法  

Full order probability method for wind loads on dynamic sensitivity buildings

作　　者：姚博[1] 全涌[1] 顾明[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《建筑结构学报》2016年第2期100-105,共6页Journal of Building Structures

基　　金：国家自然科学基金面上项目(51278367);国家自然科学基金集成项目(91215302);土木工程防灾国家重点实验室自主研究课题基金(SLDRCE10-B-03)

摘　　要：高层建筑主体结构设计风荷载受来流风速的方向性影响较为明显,传统风荷载估算方法偏于保守。为此,提出一种考虑风向的风荷载全阶概率分析方法,基于可靠度理论将单风向的风荷载概率分布表达成风荷载效应系数极值和来流风速极值的概率分布函数。为了计入结构动力敏感性的影响,基于风洞试验获得的结构气动力数据,通过对结构动力响应分析,将风荷载效应系数极值的概率分布参数表达成来流风速的函数,进而结合各个风向的风荷载概率分布数据,给出了动力敏感性结构具有一定保证率的风荷载。最后,将所提方法的计算结果与蒙特卡洛模拟方法和传统方法的计算结果进行了详细对比。结果表明,本文方法计算结果与蒙特卡洛方法模拟结果吻合较好,传统的最不利荷载法和风向折减方法计算结果过于保守。As the design wind load of high-rise buildings is significantly influenced by wind directional effect, a full- order probability method for wind load design considering wind directions is proposed to resolve the problem that the conventional method for the design load tends to be conservative. The probability distribution function of wind load is expressed as the function of the extremum of wind load effect coefficient and the velocity extreme value in single direction base on the reliability theory. In order to consider the influence of structural dynamic sensitivity, the parameters of probability distribution for extreme wind load effect coefficient are obtained by structural dynamic response analysis based on the aerodynamic data from wind tunnel tests and are expressed as the functions of the approaching wind speed. The design wind load with a certain assurance is given by considering the wind speed and the probability distribution function of wind load for all directions. At last, the result of proposed method is discussed by comparing its results with those of Monet Carlo simulation and traditional methods. Results show that the results calculated by the proposed method are fitted well with those of the Monte Carlo simulation, while the most unfavorable method and the wind reduction factor method are both too conservative.

关 键 词：动力敏感性结构 风荷载 风向 全阶概率方法 动力响应分析 

分 类 号：TU973.213[建筑科学—结构工程]