基于双向板计算的高层建筑填充墙抗风设计

Wind-Resistance Design of Infilled Walls in High-Rise Buildings Based on Two-Way Slab Calculation

目的研究高层建筑砌体填充墙的抗风设计,为砌体填充墙在高层建筑中的应用提供参考.方法通过计算典型砌块(砖)砌体填充墙在四边固定、一边固定三边简支和上下端固定左右简支3种工况下,受风荷载作用下时产生的最大应力,并与砌体弯曲抗拉强度进行对比,分析支撑最不利工况下各种墙材填充墙受力情况.结果在墙体厚度不变的条件下,墙体抗风承载力随着高宽比的减小而增大,且高宽比应控制大于0. 5;通过对其高厚比限值的修正来考虑墙体上端为自由端或柔性连接时的影响,填充墙上端为自由端时的允许高厚比可提高30%,上端为柔性连接时的允许高厚比可提高15%.结论填充墙体顶部采取固接的连接方式有助于提高墙体平面外承载力;在一边固定三边简支的工况下,混凝土砌块砌体填充墙不能满足平面外抗风设计要求,故不应采用混凝土砌块砌体作为高层建筑填充墙,其他俩工况墙材均满足要求.

The wind-resistant design of masonry infilled walls in high-rise buildings was studied to provide references for the application of masonry infilled walls in high-rise buildings.By calculating the maximum stress of typical masonry infilled walls under wind load under three support conditions of four-side fixed,one-side fixed three-side simply supported and the upper and lower fixed and the left and right supported,and comparing with the bending tensile strength of masonry values,the stress of various wall infilled walls under the most unfavorable supporting conditions is analyzed.The wind-resistant capacity of infilled wall increases with the decrease of depth-width ratio under the condition that the wall thickness remains unchanged.And the depth-width ratio should be controlled to be greater than0.5.The influence of the upper end of the wall on the free end or flexible connection is considered through the correction of the high thickness ratio limit.The allowable height-thickness ratio can be increased by30%when the top of the wall is free and15%when the top is flexible.The fixed connection at the top of the infilled wall is helpful to improve the out-of-plane bearing capacity of the wall.Under the condition that one-side fixed three-side simply supported,the concrete block masonry infilled wall cannot meet the requirements of the out-of-plane wind resistance design,so the concrete block masonry should not be used as the infilled wall of high-rise buildings,and the other wall materials in other working conditions all meet the requirements.