高层结构风振失舒率的模糊概率评价

Fuzzy Probability Evaluation on Discomfort Ratio of Wind Vibration of High-rise Buildings

提出结构风振失舒率概念,引入模糊概率理论建立高层结构风振失舒率的模糊预测评价方法,给出四种隶属度函数计算结构风振失舒率的概率评价模型,解决了高层结构产生失舒感人数及失舒率的量化计算问题。结果表明,失舒率模糊概率模型对风振作用下结构产生失舒感人数的预测是可行的,尤以升半正态形和升岭形隶属度函数建立的预测模型的计算结果最佳;结构风振加速度与失舒率之间呈"S"形变化关系,当采用振型简化计算风振失舒率时,应考虑高阶振型影响,且应选择振型组合值在结构上部增长最为迅速的阶数作为结构风振加速度计算的依据。

Through proposing the concept of the discomfort ratio of wind vibration and introducing the fuzzy probability theory,the fuzzy prediction and evaluation method for the discomfort ratio of wind vibration of high-rise buildings is established here,and the probability evaluation model for the discomfort ratio of wind vibration of high-rise buildings calculated with four kinds of membership functions is put forward,so that the quantized calculation for the discombort ratio and discomfort population distribution of high-rise buildings is solved.The results show that the fuzzy probability model for discomfort ratio is feasible for predicting the discomfort population distribution,especially the models with normal and ridge-shaped membership function are best for calculation.There appears S-shaped variation relationship between the wind vibration acceleration and discomfort ratio,so the high-order vibration mode should be considered in the calculation,and the most quickly increased order number of upper structure in the vibration mode’s composite values should be selected as the basis of the calculation for the wind vibration acceleration of high-rise buildings.