论文部分内容阅读
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。
The wind load on the main structure of high-rise building is more affected by the directionality of the incoming wind speed, while the traditional wind load estimation method is conservative. For this reason, a method of full-order probability analysis of wind load considering wind direction is proposed. Based on the reliability theory, the probability distribution of wind load in single direction is expressed as the extreme value of wind load effect coefficient and the probability distribution function of the extreme wind speed. In order to account for the influence of structural dynamic sensitivity, based on the structural aerodynamic data obtained from wind tunnel test, the probability distribution parameters of the extreme value of wind load effect coefficient are expressed as the flow velocity through the structural dynamic response analysis, The wind direction wind load probability distribution data, gives the wind power load with a certain assurance rate of the power-sensitive structure. Finally, the calculation results of the proposed method are compared with the results of Monte Carlo simulation and traditional methods. The results show that the calculated results of the proposed method are in good agreement with those of the Monte Carlo method. The traditional methods of the most unfavorable loading method and wind direction reduction method are too conservative.