大跨屋盖悬挑结构的风荷载分析

针对悬挑结构的上下表面同时受到风荷载作用的特点，提出风洞试验中同步测量的实验方法，分析上下表面风压相关性及其物理意义，给出悬挑结构平均风压和脉动风压的计算方法，探讨了同步测量和异步测量情况下峰值因子的合理取值。

Wind load on cantilevered structures of long span roofs

Generally the cantilevered structures of long span roofs are suffered from wind forces on both upper and lower surfaces resulting in a superimposing effect. In order to illustrate this resultant wind forces, a method of simultaneous measurement in wind tunnel test is proposed. The techniques on how to make the model and measure simultaneously are introduced. The correlation coefficients of wind pressures on upper and lower surfaces are studied and their physical meanings are explained. The probability distribution of resultant wind load on the cantilevered structures is discussed and the peak factors are suggested under the experiment conditions of simultaneous and asynchronous measurement.