【摘要】 为了深入研究中国木结构古建筑的结构特性,以西安清真寺木牌楼为研究对象,用弹簧单元模拟榫卯连接的半刚接特性,建立模型并对其进行有限元数值分析.通过对榫卯连接的非线性接触分析得到了其各方向刚度值;在竖向荷载作用下,由静力分析计算结果可知,其抗压、抗弯和抗剪承载力均满足要求,并且结构的平均安全裕度为85.3%;由结构模态分析得出了木楼牌前6阶频率及其振型;通过对模型在El Centro波、Taft波与兰州波作用下的地震反应分析,结果表明,木结构古建筑具有较好的耐震性能以及榫卯连接具有"遇强则强"的智能减震特点.分析及计算结果为中国木结构古建筑的维修和保护提供了理论依据.更多还原

【Abstract】 For in-depth study of the structural characteristics of ancient Chinese timber structure,the timber orna-mental gate of Xi’an Great Mosque was taken as the research object,and the spring elements were applied to simulate semi-rigidity of mortise-tenon joints.Consequently,the model was established and the finite element numerical analysis to it was carried out.The stiffness values of mortise-tenon joints were got by nonlinear contact analysis;Under the vertical load function,the test of the compressive,bent and the shear capacity all met requirements by static analysis,and the average safety margin of the structure was 85.3%.The first six natural frequencies and the mode shapes of the timber ornamental gate were obtained by model analysis.Based on earthquake response analysis to the model under El Centro,Taft and Lanzhou waves,the results show that the ancient Chinese timber structure has better aseismic performance,and mortise-tenon joint has the characteristics of intelligent absorption of shock against strong seism.Analysis and calculation results provide the theory basis for maintenance and protection of ancient Chi-nese timber structure.更多还原