基于三维弹塑性损伤演化的斗拱节点滞回性能分析  

Analysis on hysteretic performance of dou-gong connection based on three dimensional elastic-plastic damage evolution

作　　者：王明谦 许清风 周乾[2] 陈溪 冷予冰 张富文 WANG Mingqian;XU Qingfeng;ZHOU Qian;CHEN Xi;LENG Yubing;ZHANG Fuwen(Shanghai Key Laboratory of Engineering Structure Safety,Shanghai Research Institute of Building Sciences Co.,Ltd.,Shanghai 200032,China;The Palace Museum,Beijing 100009,China)

机构地区：[1]上海市工程结构安全重点实验室上海市建筑科学研究院有限公司,上海200032 [2]故宫博物院,北京100009

出　　处：《建筑结构》2021年第9期103-108,113,共7页Building Structure

基　　金：“十三五”重大科技专项课题(2018YFC0704802);上海市青年科技英才扬帆计划项目(19YF1441800)。

摘　　要：斗拱节点是传统木结构中典型的木-木连接节点之一,其滞回性能对结构的整体抗震性能至关重要。为跟踪斗拱节点在低周反复荷载作用下的损伤演化过程,基于木材三维弹塑性损伤本构模型开展了斗拱节点滞回性能的有限元模拟分析。计算结果表明,有限元模型能合理表征节点滞回曲线的捏拢效应、强度软化行为和刚度退化行为。有限元模型对节点的初始刚度和水平承载力的预测结果与已有试验结果吻合较好,模拟误差小于12.5%。该模型能合理反映栌斗和木枋在加载过程中的转动变形和斗拱节点的损伤演化过程。参数分析结果表明,斗拱节点的承载力和耗能能力随轴向压力的逐渐增加而增加,当轴向压力超过40kN后,节点的承载力增幅降低。Dou-gong connection is one of the typical wood-to-wood connections in traditional wood structure.The hysteretic performance of such connections plays an important role in the seismic performance of the whole structure.To trace the damage evolution of dou-gong connection under reversed cyclic loadings,finite element model(FEM)analysis on hysteretic performance of dou-gong connection was conducted based on three dimensional wood elastic-plastic and damage constitutive model.Calculation results indicate that the FEM can reasonably represent pinch effect,strength softening behavior and stiffness degradation behavior of the connection hysteretic curve.The prediction results of the FEM on the initial stiffness and horizontal bearing capacity of the connections are in good agreement with the test results,and the simulation errors are less than 12.5%.The FEM can reasonably reflect the rotational displacements of cap block and wood beams during loading process and the damage evolution of dou-gong connection.Parametric analysis results indicate that the bearing capacity and energy dissipation capacity of dou-gong connection increase with the gradual increase of axial force.When the axial force exceeds 40kN,the connection bearing capacity decreases in growth.

关 键 词：弹塑性损伤模型 斗拱节点 滞回性能 轴向压力 

分 类 号：TU366.2[建筑科学—结构工程]