摘要
我国的《木结构设计标准》(GB 50005—2017)中给出两种适用于低、多层建筑的木结构形式,分别为第7章的木框剪剪力墙体系和第9章的轻型木结构体系。对于轻型木结构体系国内外学者已经做了大量的研究而木框架剪力墙的研究相对较少。文章对不同端柱截面的小截面木框架剪力墙进行了低周反复加载试验,并采用ABAQUS有限元通用软件,通过自定义非线性弹簧单元模拟钉连接进行墙体数值模拟分析,研究墙体的抗侧性能和端柱对抗侧性能的影响。文中提出一种考虑了钉连接刚度、钉排布方式、端柱截面等因素的墙体剪切刚度计算方法,完善了小截面木框架剪力墙体刚度的计算理论。结果表明:剪力墙极限荷载、剪切刚度、累积耗能均随端柱截面的减小而降低;不同端柱截面的墙体延性系数接近并且均大于3,墙体具有较好的塑性变形能力;剪力墙工作过程中间柱、端柱应变较小,始终处于弹性阶段;提出的计算方法与试验结果、数值模拟结果均吻合良好,为该类结构体系的性能研究及工程设计提供了计算依据。
Standard for Design of Timber Structures(GB 50005—2017)provides two forms of wood structures suitable for low-height and multi-story buildings:the wood-frame shear wall system in Chapter 7 and the light-frame wood structure system in Chapter 9.Extensive researches have been conducted on the light-frame wood structures,while researches on the wood-frame shear wall are quite limited.In this work,the lateral resistant performance of small sectional wood-frame shear walls with different end column sizes and the effect of the end columns on the lateral resistant performance were investigated by low-cycle reciprocating loading tests and the numerical simulations using the ABAQUS software(by applying custom nonlinear spring elements to simulating sheathing-frame connection performance).A method for calculating shear stiffness of walls taking into account nail connection stiffness,nailing arrangements,and end column cross-section was proposed,so that the theory of calculating the stiffness of small sectional wood-frame shear walls can be improved.The results show that:the ultimate load,shear stiffness and cumulated energy dissipation of shear walls may decrease with the decrease of end column size;the ductility coefficients of walls with different end column sections are close to and greater than 3,indicating that the walls have the good plastic-deformation capacity;the strains of studding and end column are relatively small and the columns are in elastic stage during the whole test procedure;the proposed calculation method agrees well with the experimental results and numerical simulation results,and hence it provides a calculation basis for the performance analysis and design of this kind of structural system.
作者
龙卫国
李秋稷
刘宜丰
鲁纹帆
欧加加
Long Weiguo;Li Qiuji;Liu Yifeng;Lu Wenfan;Ou Jiajia(China Southwest Architectural Design and Research Institute Co.,Ltd.,Chengdu 610042,China;Tsinghua University,Beijing 100084,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2023年第9期15-25,64,共12页
China Civil Engineering Journal
基金
国家重点研发计划(2019YFD1101001)。
关键词
木框架剪力墙
低周反复荷载
剪切刚度
计算方法
抗侧性能
wood frame shear wall
low⁃cycle reciprocating loading
shear stiffness
calculation method
lateral resistance performance
