【摘要】 为研究山地地形对砖石古塔地震响应的影响，以位于四川中江县铜鱼山顶的中江南塔作为原型，选取了汶川地震发生时自贡台阵的加速度记录为基底输入，通过小型振动台试验研究了山底、山顶古塔自振频率随地震动幅值的变化趋势，分析了地形效应对古塔地震响应的影响及古塔破坏特征。结果表明：在低幅值地震动作用下古塔自振频率不变，当自由地表地震动峰值分别达到100 Gal和150 Gal时，山顶和山底古塔发生破坏；在古塔自振特性、输入地震动的频谱特征以及结构构造特点影响下，古塔发生了“上轻下重”的破坏特征；与山底古塔相较，山顶古塔地震反应明显更大，相同工况下山顶古塔各楼层峰值加速度、最大相对位移、最大层间位移角分别为山底古塔的2～3倍、1.5～4.5倍、1.5～4.5倍，其中最大相对位移和最大层间位移角的放大倍数与地震动幅值相关，因此需重视山顶古塔的地震安全性。更多还原

【Abstract】 In order to study the influence of mountainous topography on the seismic response of the ancient masonry pagoda, we took the Zhongjiang South Pagoda located on top of the Tongyu Mountain in Zhongjiang County, Sichuan Province as a prototype, and selected the acceleration recordings by the stations of the Zigong Array during the Wenchuan M_S8.0 earthquake as the input, and studied through a small shaking table test the variation trend of the natural vibration frequency of the structure at the bottom and on top of the mountain with the amplitude of input ground motion.We further analyzed the influence of the topographic effect on the seismic response of the ancient pagoda and the failure mode of the pagoda.The results show that the natural frequency of the ancient pagoda remains unchanged under the action of low-amplitude ground motion, and when the peak of free surface ground motion reaches 100 Gal and 150 Gal respectively, the ancient pagodas on top and at the bottom of the mountain is damaged.Under the influence of the natural vibration characteristics of the ancient pagoda, the spectral characteristics of the input ground motion and the building constitution, the ancient pagoda has undergone a failure mode of “slight on top and severe at the bottom”.The peak acceleration, maximum relative displacement and maximum inter-story drift of each floor of the ancient pagoda at the top of the mountain are 2-3 times, 1.5-4.5 times and 1.5-4.5 times of those at the bottom of the mountain under the same working conditions, and the amplification factor of maximum relative displacement and maximum inter-story drift is related to the amplitude of input seismic motion.Thus, it is necessary to pay attention to the seismic safety of the ancient pagoda on the mountain.更多还原