【摘要】 中国木结构古建筑以良好的抗震性能著称于世,这与其构造特征密切相关.为探讨古建筑侧脚、斗拱、榫卯连接、厚重屋顶和填充墙体等构造的减震性能,采用数值模拟方法,以故宫太和殿为例进行分析.采用ANSYS有限元分析程序,基于上述构造特征,建立太和殿的有限元模型.通过模态分析,讨论了不同构造特征对太和殿自振周期的影响;通过地震响应分析,研究不同构造特征下,模型典型节点的位移、加速度响应峰值的变化特征,定量获得了不同构造对太和殿减震性能的贡献作用.结果表明:不同工况条件下,不考虑墙体时太和殿模型的基本自振周期最大,不考虑榫卯连接时太和殿模型的自振周期最小;地震作用下,不同构造对减小太和殿结构位移响应的贡献程度大小顺序为:墙体>榫卯节点>斗拱>侧脚>厚重屋顶;不同构造对减小太和殿结构加速度响应的贡献大小顺序为:榫卯节点>墙体>斗拱>侧脚>厚重屋顶.更多还原

【Abstract】 Chinese ancient timber buildings are famous for their good aseismic behaviors,which relates closely to their constitutions.To find out aseismic behaviors of constitutions such as Cejiao,toukung(bracket sets),tenon-mortise joint,heavy roof,filler wall and so on,Tai-he Palace in the Forbidden City was taken as example for analysis.Based on constitutions above,finite element model of Tai-he Palace was built by ANSYS program.By modal analysis,influences of constitutions to model of Tai-he Palace were discussed;by seismic response analysis,typical nodes were selected to study their displacement and acceleration responses considering different constitution conditions.Results show that natural vibration period of the model is maximum when omitting constitution of filler wall,and minimum when omitting constitution of tenon-mortise connection;under earthquakes,filler wall > tenon-mortise joint > bracket sets > Cejiao > heavy roof in reducing displacement responses of model,tenon-mortise joint > filler wall > bracket sets >Cejiao > heavy roof in reducing acceleration responses of model.更多还原