内填黏土实心结构砖塔振动台试验研究

发布时间：2018-05-16 07:05

本文选题：砖石古塔 + 振动台试验　；参考：《建筑结构学报》2017年12期

【摘要】：为研究实心结构古塔在地震作用下的动力反应及破坏机制,以陕西省西安市兴教寺玄奘塔为原型,设计制作了1∶8比例模型结构,进行了振动台试验。通过输入不同烈度的单向、双向及三向地震波,测试了结构楼层的位移及加速度反应,观测了结构破坏现象,分析了结构的动力特性变化规律,对比了各加载工况下结构各楼层地震反应的变化特点。结果表明,设防地震作用下塔体底部楼层首先发生水平开裂与塔身斜向开裂,随着地震烈度的提高,破坏区域随之向上延伸,结构自振频率降低,频响曲线峰值点增多;当地震烈度相同时,不同加载工况下结构的水平反应峰值相差不大,但不同地震波作用下竖向加速度反应峰值相差较大;动力放大系数随楼层高度呈"S"形分布,顶层的水平加速度反应最大,中部楼层的竖向地震反应最大。因此,古塔破坏是在水平向与竖向地震共同作用下发生的,结构的底部及中部楼层为抗震的薄弱部位。
[Abstract]:In order to study the dynamic response and failure mechanism of the solid structure ancient pagoda under earthquake action, the 1:8 scale model structure was designed and made with the Xinjiesi Xuanzang Tower in Xi'an City, Shaanxi Province as the prototype, and the shaking table test was carried out. By inputting unidirectional, bidirectional and three-direction seismic waves with different intensities, the displacement and acceleration responses of the structure floor are measured, the structural failure phenomena are observed, and the dynamic characteristics of the structure are analyzed. The characteristics of seismic response of each floor of the structure under different loading conditions are compared. The results show that horizontal cracking and oblique cracking occur first in the bottom floor of tower body under earthquake protection. With the increase of seismic intensity, the damage area extends upward, the natural vibration frequency of the structure decreases, and the peak points of frequency response curve increase. When the seismic intensity is the same, the peak value of horizontal response of the structure under different loading conditions is not different, but the peak value of vertical acceleration response under different seismic waves is quite different, and the dynamic magnification factor is distributed in "S" shape with the height of the floor. The horizontal acceleration response of the top floor is the largest, and the vertical seismic response of the middle floor is the largest. Therefore, the destruction of ancient pagoda occurs under the joint action of horizontal and vertical earthquakes, and the bottom and middle floors of the structure are the weak parts of earthquake resistance.
【作者单位】：西安理工大学土木建筑工程学院;
【基金】：国家自然科学基金项目(51308455) 陕西省自然科学基金项目(2015JM5206) 陕西省博士后基金项目
【分类号】：TU973

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