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采用有限元方法,研究古塔在整体平移前后的动力特性及抗震性能。考虑塔檐、塔刹以及开洞等构造,建立古塔平移前后的三维实体有限元模型,分别对平移前后模型进行模态分析和时程分析,对比在多遇地震与罕遇地震作用下古塔结构的位移时程反应、加速度时程反应以及应力分布。结果表明:平移后古塔主体结构的频率小于平移前的频率;在地震作用下平移后古塔的位移、加速度和应力相比平移前均增大;古塔塔刹的位移反应明显大于塔身,古塔的最大层间位移角随层高增加而增大;多遇地震作用下古塔结构主体完好,罕遇地震作用下平移前古塔塔刹轻微破坏,平移后塔刹严重破坏;古塔底层墙体以及2层墙体与塔檐连接处应力较大,底层墙角处最大应力值已超过材料抗拉强度。
The finite element method is used to study the dynamic characteristics and anti-seismic performance of the ancient tower before and after translation. Considering the structure of tower eaves, towers and openings, the 3D solid finite element model before and after the translation of ancient pagoda was established. The modal analysis and time history analysis of the model before and after translation were made respectively. Compared with those under ancient and rare earthquakes Displacement reaction of tower structure, acceleration time-history reaction and stress distribution. The results show that the frequency of the main structure after translation is smaller than that before translation. The displacement, acceleration and stress of the post-translation ancient pagoda increase under the action of earthquake. The displacement response of the ancient tower is obviously greater than that of the tower The maximum displacement angle of the ancient pagoda increases with the increase of the height of the pagoda; the main pagoda structure remains intact under the frequent earthquake; the pre-translating Guta Tazha subtle damage is caused by the rare earthquakes and the tower brakes are severely damaged after the translation; The bottom wall of the tower and the stress of the connection between the two-layer wall and the tower eave are large, and the maximum stress value of the bottom corner has exceeded the tensile strength of the material.