应县释迦塔扭转振动特性和地面周期性强迫振动试验与分析

The Experiment and Analysis of the Twist Vibration Characteristics and Forced Vibration of Yingxian Wooden Tower

对释迦塔实体结构进行现场环境振动测试试验,经分析得到了木塔各层不同自振频率下的扭转振型,指出木塔各层扭转与平动耦合振动导致现在其扭转和平动残损变形显著;通过周期性地面振动加载,实测得到各层相应频率下的的位移、速度和加速度时程曲线;考虑木塔木材和连接的非线性,选择了试验得到的双线型骨架曲线来描述木塔的层间恢复力计算模型,采用能量转换,求出相应点的非线性地震位移反应。

Yingxian Wooden Tower is faced with repairing and preservation. From the environment vibration test we got the tower twist vibration modes about different frequencies. The results enunciate that the consociation of twist vibration and straight line vibration made the obviously remained transforms. Through periodic ground forced vibration, the timing curve of displacement, speed and acceleration are gotten. The horizontal elastic-plastic displacements of each storey were analyzed in terms of equivalent energy principle.