传统多高层楼阁式木塔摇摆侧剪行为分析

中国传统多高层楼阁式木塔的结构设计和抗震性能持续受到关注。提出楼阁式木塔建模方法,利用某七层唐风木塔振动台模型试验结果验证其有效性,在此基础上开展结构摇摆分量和侧剪分量的变化对传统多高层楼阁式木塔抗震性能的影响分析。结果表明:增加结构的侧剪分量能增强结构的刚度、减小结构在不同地震强度下的位移反应,但同时增大了结构的加速度放大系数和层间剪力;提高结构的摇摆分量会增强结构在强震作用下的非线性反应,随着地震强度的增加,结构下部楼层层间位移角和层架剪力均增大,上部楼层加速度放大系数呈先增大后减小趋势。

Analysis on rocking and racking behavior of traditional multi-story pavilion-style timber pagodas

The structural design and seismic performance of Chinese traditional multi-story pavilion-style timber pagoda persistently attract researchers'' attention. In this paper, a modeling method of pavilion-style timber pagoda was proposed and verified by using the shaking tablet test results of a scaled seven-story Tang-style timber pagoda. Based on it, the influence of structural swing component and lateral shear component on the seismic performance of traditional multi-story timber pagoda was investigated.The results show that increasing the lateral shear component could improve the structural stiffness and decrease the displacement response under different earthquake intensities, and obtain larger acceleration amplification coefficients and inter-story shear force of the structure simultaneously;The increase of the rocking component will lead to higher nonlinear response under high intensity earthquake.With the increase of the excitation intensity, the inter-story drifts and shear forces of lower floors increase and the acceleration amplification coefficients of upper floors increases first and then decreases.