砖石古塔弹性地震反应分析方法研究

摘要

以某砖石古塔为工程背景,探讨了其动力特性的主要特征,以振型分解反应谱法为基准,分析了不同塔高时砖石古塔地震反应简化分析方法的适用性.结果表明:对于较高的砖石古塔,高阶振型对塔体地震反应的贡献不可忽略.为安全计,对于矮塔若采用简化分析方法时,建议顶部附加地震作用系数可取0.2.对于高塔采用振型分解反应谱法计算的塔体截面弯矩与剪力有部分截面超出了简化分析方法的包络区域,最大误差达20%.因此建议采用振型分解反应谱法分析高塔的地震反应.研究结果可为砖石古塔的地震反应分析方法提供参考.%The main characteristics of the dynamic characteristics are discussed by taking a masonry pagoda as the engineering background.The applicability of seismic response simplified analysis method was researched on the different height of masonry pagoda by comparing with the modal decomposition response spectrum method.The result shows that the contribution of high order mode to the earthquake response of the tower body can not be ignored for high masonry pagoda.As a safety precaution,it is suggested that the additional earthquake action coefficient at the top of the tower is 0.2 if the simplified analysis method is adopted.The section of bending moment and shearing force calculated by the mode decomposition response spectrum method of tower is in the envelope region of the simplified analysis method and the maximum error is 20%.It is suggested that the seismic response of tower is analyzed by the mode decomposition response spectrum method.The results of this study can provide a reference for the seismic response analysis method of masonry in masonry pagoda.