摘要
榫头部分拔出是现存古建筑木结构榫卯节点的典型残损类型之一,对榫卯节点的滞回性能及整体结构的抗震性能有很大影响。以易于发生拔榫的直榫节点为研究对象,通过分析其在拔榫状态和未拔榫状态下的荷载传递机制,发现两者的受力机理相同。基于此建立了未拔榫状态下直榫节点的有限元分析模型,其弯矩-转角滞回性能模拟结果与已有试验结果的对比分析表明,所建有限元模型可行。在此基础上,通过定义拔榫程度为0、1/10、2/10和3/10,分析了拔榫量对直榫节点滞回性能的影响规律。结果表明:随着榫头拔出量的增大,节点的承载能力降低,变形能力变弱,抗震性能也有着不同程度的退化。所建有限元模型及其分析结果能够为拔榫状态下单向直榫节点的抗震分析及其震后修复加固提供有利参考。
The pullout of a tenon from the mortise which is one of the typical degradation types of ancient timber structures has significant influence on the seismic performance of the joints and structures.Straight mortise-tenon joints were selected as the object.The load transfer mechanism of such joints with and without pulled-out tenons was analyzed,and the same mechanical mechanism was found.A finite element model(FEM)used to simulate the joint without pulled-out tenons was established.The moment-rotation hysteretic curves from both FEM simulation and the results of a previous test by the authors were compared and they agreed well.The simulation results show that the strength and deformation of a joint with a pulled-out tenon decreases with the increase of the pulled-out length.The FEM and related analyses can provide good reference for the seismic analysis of ancient timber structures.
作者
谢启芳
张利朋
王龙
崔雅珍
杨柳洁
XIE Qi-fang;ZHANG Li-peng;WANG Long;CUI Ya-zhen;YANG Liu-jie(State Key Laboratory of Green Building in Western China, Xi’an University of Architecture & Technology, Xi’an, Shaanxi 710055, China;Xi’an Qujiang New District Construction Project Quality & Safety Supervision Station, Xi’an, Shaanxi 710061, China)
出处
《工程力学》
EI
CSCD
北大核心
2019年第B06期138-143,共6页
Engineering Mechanics
基金
国家自然科学基金项目(51278399
国家重点研发项目(2017YFC0703507)
陕西省重大基础研究项目(2016ZDJC-23)
关键词
古建筑木结构
直榫节点
榫头拔出
有限元模型
滞回性能
ancient timber structures
straight mortise-tenon joint
pulled-out tenon
finite element model
hysteretic performance
