【摘要】 为保护古建筑,采用绝对位移直接求解的虚拟激励法,利用ANSYS有限元分析软件的谐响应分析模块,以故宫神武门为例,研究了均匀地面运动下古建筑木结构的随机地震动响应特征。建立了神武门的有限元模型,通过模态分析,获得了神武门的基频;通过一致均匀地面运动平稳激励作用下结构的响应分析,获得了结构典型节点的位移和加速度响应功率谱,并讨论了榫卯节点、斗木共、侧脚及基底滑移等构造的影响。研究表明:神武门的基频为1.07 Hz,在一致均匀地面平稳激励作用下,结构位移及加速度响应功率谱的峰值在与结构体系基频相同值时发生;榫卯节点、斗木共、侧脚及柱础浮搁等构造均有利于结构发挥抗震性能。更多还原

【Abstract】 In order to protect Chinese ancient buildings,the Shen-Wu Gate in the Forbidden City was taken as an example to study its stochastic seismic response characters by absolute displacement solution based on pseudo excitation method and harmonic response analysis of ANSYS program.Finite element model of Shen-Wu Gate was built.Then by modal analysis basic frequency of the structure was obtained;By harmonic response analysis displacement and acceleration response power spectral density of typical nodes under even ground stationary random excitation were obtained.Constitution parameters were also discussed.Results show that basic frequency of Shen-Wu Gate is 1.07 Hz,under even ground stationary random excitation peak values of response power spectral density of the structure occur at its basic frequency value,constitutions such as tenon-mortise joints,tou-kung,cejiao,floating column base and so on are all practical for earthquake resistance.更多还原