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简述底部剪力法的适用范围,计算中如何鞭稍效应。

问答题
2021-09-17 13:04
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正确答案

震中距--地面上任何一点到震中的直线距离称为震中距。
适用范围:高度不超过40米,以剪切变形为主且质量和刚度沿高度分布比较均匀的结构,以及近似于单质点体系的结构,可采用底部剪力法计算。
为考虑鞭稍效应,抗震规范规定:采用底部剪力法计算时,对突出屋面的屋顶间、女儿墙、烟囱等的地震作用效应,宜乘以增大系数3,此增大部分不应往下传递,但与该突出部分相连的构件应予以计入。


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