竖向地震下超高层建筑结构的简化波动分析

Simplified wave propagation analysis of high-rise buildings under vertical earthquakes

摘要:

为研究近断层地区竖向地震下超高层建筑结构的脉冲波动效应,将典型超高层建筑结构体系分别简化为一维和二维模型,在弹性范围内,确定纵波通过集中质量的反射和透射系数,以时域差分延时和FFT频域滤波为求解策略,用简化波动分析方法计算结构在竖向地震下的宏观响应,评估结构在竖向地震下的抗震性能．分析表明,与振动分析方法相比,波动分析方法在计算结构竖向地震响应时更具有针对性,特别是近场脉冲型竖向地震下．竖向地震引起轴向构件的轴力波动和相对错动不容忽视．

Abstract:

To study the impulse wave effect of high-rise buildings under vertical earthquake near fault region, simplified wave propagation method is adopted. In elastic range, typical structural system is simplified as one and two dimensional model, and reflection and transmission coefficients of longitudinal wave through lumped mass are determined. Structural vertical seismic macro response is calculated by simplified wave propagation method in which difference time delay and FFT filter are used. The analysis shows that, compared with the vibration method, the wave propagation method is more targeted in calculating structural vertical seismic response, especially under impulse-type vertical earthquake. The axial force fluctuation and relative movement caused by vertical earthquake can not be ignored.