某工程无楼板支承的楼梯间剪力墙稳定性分析

Stability Analysis of Stairwell Shear Wall Without Floor Supports in a Project

一栋超高层住宅的楼梯间设置在平面外侧,该楼梯间外侧剪力墙无楼板支承作用。对该片墙体采用弹性力学解析解方法、特征值屈曲分析方法、非线性屈曲分析方法分别计算了有梯板支撑模型和没有梯板支撑模型的屈曲承载力。通过分析可知,计算剪力墙稳定性时,可以将梯段斜板看作墙体的支撑点进行稳定性计算。通过非线性稳定性分析(弹塑性)可知,结构先发生混凝土压溃,而并未发生失稳,此时的轴力远大于规范稳定性计算限值。

A staircase of a high-rise residence is located on the outside,and the shear wall outside the staircase has nosupports from the floor.An analytical solution method of elasticity,buckling analysis method and non-linear buckling analysis method were used to calculate the buckling strength.It can be seen that when the stability of the shear wall is calculated,staircase plate can be regarded as the supporting point of the wall.Through the elasto-plastic nonlinear stability analysis,it can be seen that concrete crush occurs first,and instability of the wall does not happen.The axial force is much larger than the standard stability limit.