【摘要】 为研究古建筑城墙抗震性能,对其修缮保护提供依据,以某处古建筑外包砖城墙为对象,对其等比例缩尺模型进行振动台试验,依次施加三级地震荷载,对模型结构的动力响应进行监测,并对震后破坏形式及模型动力特性进行分析。研究结果表明:震后破坏严重部位为:中部、底部、砖土接触面;在设防烈度地震(8度)、罕遇地震作用下,城墙顶部、底部的相对位移随加载值增大而明显增大;随荷载增加与结构破坏,模型中、上部测点的加速度值放大系数β变小;结构经振动作用后,自振频率降低81. 8%。更多还原

【Abstract】 In order to study the anti-seismic performance of the ancient city wall,and to provide the basis for the improvement and protection of the ancient building,a shaking table test on the small scale model of the ancient city wall is carried out. It applies three orders of seismic load to the model in turn and detects the dynamic response of the model structure to analyze the damage form after earthquake and the dynamic characteristics of the model. The results show that: the serious damage areas after the earthquake are in the part of middle,bottom and brick-soil contact surface of the model; under the action of fortification intensity( 8 degrees) and rare intensity earthquakes,the relative displacement between the top and bottom of the city wall increases obviously with the increase of loads; with the increase of the loads and the failure of the structure,the magnification factor β of the acceleration value of the middle,upper part of the model decreases; after vibration,the natural frequency of vibration of the structure is reduced by 81.8%.更多还原