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为获取中国木结构古建筑保护和修缮中的技术参考依据,以西安城墙永宁门箭楼为研究对象,采用SAP2000有限元软件中摩擦摆隔振单元模拟柱脚平摆浮搁式连接、橡胶隔振单元模拟斗栱层及虚拟弹簧单元模拟榫卯连接,建立了结构空间有限元模型,并进行动力分析。通过3个模型(柱脚刚接、铰接和平摆浮搁连接)的模态对比分析,发现平摆浮搁连接方式能够延长结构的周期,其中前三阶周期变化较明显,分别比柱脚刚接、铰接时延长了约72%和24%;通过反应谱和动力时程分析,得到各个层面的动力放大系数,结果表明,木结构古建筑的隔震性能主要体现在柱脚、梁柱榫卯连接和铺作层部位;耗能分析结果表明,输入的地震能量大部分被结构自身的振型阻尼(平均74.32%)和结构的连接(11.89%)所消耗。
In order to obtain the technical reference for the protection and repair of ancient Chinese wooden buildings, taking Yongning Gate watchtower of Xi’an city wall as the research object, the paper adopts SAP2000 finite element software, The unit simulation bucket and the virtual spring unit simulate the tenon-mortise connection, and the finite element model of the structure space is established, and the dynamic analysis is carried out. By comparing and analyzing the modalities of the three models (the connections of the column foot, the hinged and the floating pendulum), it is found that the pendulum floating connection can prolong the period of the structure. The changes of the first three stages are obvious, The results show that the isolation performance of the ancient buildings with wooden structure is mainly reflected in the column foot, the tenon-mortise connection of the beam column and the mortise and tenon joint And the pavement layer. The results of energy dissipation analysis show that most of the input seismic energy is consumed by the mode’s own damping (average 74.32%) and structural connection (11.89%).