木构架古建筑基本周期的分析方法  

Analysis method for fundamental period of ancient timber frame buildings

作　　者：袁建力[1] 杨韵 YUAN Jianli;YANG Yun(College of Architectural Science and Engineering,Yangzhou University,Yangzhou 225009,China;Yangzhou Architectural Design and Research Institute,Yangzhou 225009,China)

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225009 [2]扬州市建筑设计研究院,江苏扬州225009

出　　处：《地震工程与工程振动》2024年第3期174-181,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金重点项目(51338001)。

摘　　要：针对现行规范近似公式存在的不足,结合单层、两层砖围护墙木构架古建筑的构造特征,构建了设有集中质量和连续分布质量的悬臂杆分析模型,以考虑屋顶、楼盖的质量和位置,以及围护墙、木构架的质量和刚度分布规律。依据结构动力学原理,采用等效质量法将分析模型等效为单质点悬臂杆模型,推导了中部集中质量和连续分布质量的等效公式,以及基本自振周期的计算公式。所研制的分析模型较好地反映了古建筑的大屋顶、楼盖及围护墙对结构自振周期的影响,相应的计算公式可以得出结构的横向和纵向基本周期。结合3座典型古建筑的动力特性试验研究,介绍了计算公式的运用方法,并将基本周期的计算值与实测值进行了对比,表明提供的分析方法适用于围护墙在横向、纵向不同布置的木构架古建筑的基本周期分析。In view of the shortcomings of the approximate formula in current standards,combining with the structural characteristics of single-story and two-story brick enclosure wall-timber frame ancient buildings,a cantilever analysis model with concentrated mass and continuous distributed mass is constructed to consider the mass and position of the roof and floor,as well as the distribution law of the mass and stiffness of the enclosure wall and timber frame.According to the principle of structural dynamics,the analytical model is equivalent to a single point cantilever model by using the equivalent mass method.The equivalent formulas of the central concentrated mass and the continuous distributed mass and the calculation formulas of the fundamental period are derived.The developed analytical model can well reflect the influence of the large roof,floor and wall on the natural vibration period of the ancient buildings,and the corresponding calculation formula can be used to obtain the transverse and longitudinal fundamental period of the structure.Combined with the experimental study of the dynamic characteristics of three typical ancient buildings,the application method of the calculation formula is introduced,and the calculated value of fundamental period is compared with the measured value.It shows that the analysis method provided in this paper is suitable for the analysis of the fundamental period of the ancient timber frame buildings with different transverse and longitudinal arrangement of the enclosure walls.

关 键 词：木构架古建筑 自振周期 结构动力学 力学模型 抗震分析 

分 类 号：TU366.2[建筑科学—结构工程]