摘要
不同构造形式及其参数取值对木结构古建筑的动力特性及抗震性能有直接影响,因此研究参数变化对结构动力性能的影响规律,对于木结构古建筑的修缮与加固保护具有重要的指导意义。基于宋代《营造法式》制作了某单层单开间殿堂式木结构模型,建立了考虑柱础滑移隔震、榫卯半刚性连接及斗栱减震性能的空间杆系有限元模型,并与单向水平地震激励下的振动台试验进行了对比;通过参数分析探索了木结构斗栱、榫卯及屋盖等不同构造方式及相应结构参数取值的改变对其抗震性能的影响。结果表明:随着斗栱刚度的增大,整体结构的自振频率收敛于上限2.08 Hz,且其耗能减震作用逐渐变弱;随着榫卯节点的刚度逐渐变大,整体结构的自振频率收敛于上限3.26 Hz,柱脚的滑移量会随之增大而柱架侧移却随之减小,而榫卯节点刚度的减小在减少柱脚滑移量的同时会使得柱架的侧移变形大大增加,榫卯节点的刚度变化对结构自振频率的影响程度大于斗栱刚度;屋盖质量的增加会降低结构的自振频率,增大斗栱的水平变形,提高整体结构的抗震能力。
The different structural forms and their parameters directly affect the dynamic characteristics and seismic performance of the ancient timber-framed buildings. The influence of the change of the parameters on the dynamic performance of the structure is studied by the finite element modeling and parameter analysis. It will provide reference for the repair and reinforcement of ancient timber-framed buildings. Based on the model of a single-storey place house made by Ying Zao Fa Shi of the Song Dynasty, a 3-D beam-spring FEM model is established, which involves the sliding isolation of column root, energy dissipation of Dou-gong and semi-rigid behavior of mortise-tenon joints. Then a comparison is made with the shaking table test under unidirectional earthquake excitations. Furthermore, a parametric analysis is conducted through the change of structural configuration such as mortise-tenon joint, Dou-gong and roof and corresponding parameters. The results show that： with the increase of the lateral stiffness of Dou-gong, the natural frequency of the whole structure converges to the upper limit of 2. 08 Hz, the ability of shock absorption of the structure becomes weaker. With the increase of mortise-tenon joints stiffness, the natural frequency of the whole structure converges to the upper limit of 3.26 Hz, while the slippage of the column increased and the lateral displacement of the column reduced. With the reduction of the stiffness of the mortise-tenon joints, the slippage of the column reduced while the lateral displacement of the column increased at the same time. The influence of the stiffness change of the mortise-tenon joints on the building5s natural frequency is greater than that of the Dou- gong. The natural frequency of the structure reduced by the increase of the roof mass, while the deformation of the Dou-gong increases and helps improve the seismic capacity of the whole structure.
作者
张锡成
马赫迪
代武强
吴晨伟
Zhang Xicheng;Ma Hedi;Dai Wuqiang;et at.(School of Civil Engineering, Xi＇an University of Architecture and Technology, Xi＇an 710055,China)
出处
《山东建筑大学学报》
2017年第5期426-434,共9页
Journal of Shandong Jianzhu University
基金
国家自然科学基金项目(51508454)
陕西省自然科学基础研究基金项目(2016JQ5060)
陕西省教育厅科研计划项目(15JK1444)
西安建筑科技大学青年科技基金项目(QN1612)
西安建筑科技大学人才科技基金项目(RC1404)
关键词
木结构古建筑
杆系模型
构造方式
抗震能力
ancient timber-frame buildings
beam-column element model
structural configuration
seismic capacity
