Effect of vector span ratio on wind resistance of large span arch roof
矢跨比对大跨拱形屋盖抗风性能的影响分析

摘要

拱形屋盖为工业厂房、仓储等建筑广泛应用，屋盖体型是影响结构受风载大小的重要因素。本文采用CFD数值模拟方法，分析了不同矢跨比下拱形屋盖的风压及风速变化，并总结了矢跨比增加对建筑前后流场的影响，结果表明：拱形屋盖表面风速极值区域一般出现在屋顶位置，建筑两侧在矢跨比为1/8时，中心位置风速为负值，而随着矢跨比增大，负值风速逐渐转变为正值，前流场建筑立面底部也由一开始的负值风速转为正值。而屋面风压系数皆为负值，即结构屋面受风吸作用很大，且在屋面最顶部位置负风压系数最大，随着矢跨比增大，该位置处负值风压继续增大。

Abstract

Arch roof is widely used in industrial plant, storage and other buildings. The size of the roof is an important factor affecting the wind load size of the structure. This paper uses CFD numerical simulation method, analyzes the wind pressure and wind speed change of the arch roof, and summarizes the influence of the increase of the extreme wind speed area of arch roof surface generally appears on the roof position, on both sides of the ratio, the central wind speed is negative, and with the negative wind speed gradually changed to positive, the bottom of the building facade from the initial negative wind speed to positive. The roof air pressure coefficient is all negative, that is, the structural roof is greatly affected by air absorption, and the negative wind pressure coefficient is the largest at the top position of the roof. As the sagittal span ratio increases, the negative wind pressure at this position continues to increase.