摘要
研究木结构古建筑的结构特性对保护和维修古建筑遗产具有重大意义。文中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,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;在竖向荷载作用下结构的实际内力远小于其强度设计值,其安全裕度在60%以上;给出了结构的运动微分方程,结构模态分析得出木牌楼前6阶频率及其振型;通过谱分析与时程分析,结果表明木结构古建筑的偏柔特性,并具有较好的减震耗能特性以及榫卯连接"遇强则强"的智能减震特点。分析及计算结果为木结构古建筑的维修和保护提供了理论依据。
The study on the mechanic performance of ancient Chinese timber structures is of great significance.Taking the pai-lou gateways of Xi＇an Great Mosque as a research object,and using the spring elements to simulate the semi-rigid mortise-tenon joints,the authors performed a finite element numerical analysis.The stiffness values of mortise-tenon joints were got by nonlinear contact analysis.Under the vertical load,the internal forces of structure are far less than its design value,and the safety margin of the structure is beyond 60%.The equation of motion for the structure was formulated and the first six natural frequencies and the vibration performance of the pai-lou were got by the model analysis.Based on spectrum analysis and time-history analysis,the results show that the ancient Chinese timber structure is flexible,and has a better energy dissipation performance.Analysis results provide the theory basis for maintenance and protection of Chinese ancient timber structures.
出处
《地震工程与工程振动》
CSCD
北大核心
2011年第3期108-114,共7页
Earthquake Engineering and Engineering Dynamics
基金
陕西省重点学科建设专项资金资助项目(E01004)
陕西省教育厅专项科研项目(2010JK635)
西安建筑科技大学基础研究基金项目(JC0722)
西安建筑科技大学人才基金项目(RC0823)
关键词
木结构古建筑
榫卯连接
接触分析
地震反应分析
ancient Chinese timber structure
mortise-tenon joint
contact analysis
earthquake response
