摘要
为提高胶合木框架结构性能,提出柔性支撑与正交胶合木(CLT)墙体协同抗侧的分层装配式钢-木混合结构体系。针对CLT墙体和柔性支撑框架协同抗侧机制,开展两榀CLT墙体-柔性支撑组合框架的低周反复加载试验,并通过有限元方法进一步研究CLT墙体与柔性支撑框架的抗侧刚度比、CLT墙体与钢连梁的转动刚度比对组合框架抗侧性能的影响。试验结果表明:组合框架各构件的破坏顺序依次为柔性支撑受拉屈服、胶合木柱端开裂和CLT墙体抗拔连接节点破坏;柔性支撑主要在组合框架弹性阶段发挥作用;CLT墙体在组合框架弹塑性阶段承担超过50%的水平力。通过有限元分析发现,当CLT墙体与柔性支撑框架的抗侧刚度比大于0.055时,CLT墙体承担水平力比例大于25%,CLT墙体与钢连梁的转动刚度比取值为0.52~0.84时,既可保障组合框架强柱弱梁的破坏模式,又可充分发挥CLT墙体的承载能力。
To improve the performance of laminated timber frame structure systems,a beam-through steel-timber hybrid structure combining tension-only bracing and cross-laminated timber(CLT)walls for synergistic lateral resistance was proposed.To investigate the synergistic lateral resistance mechanism between CLT walls and tensiononly braced frames,low-cycle repeated loading tests were conducted on two CLT wall-tension-only bracing composite frames.Furthermore,the impact of the lateral stiffness ratio between the CLT wall and the tension-only braced frame,as well as the rotational stiffness ratio between the CLT wall and the steel coupling beam,on synergistic lateral resistance was studied using finite element methods.The experimental results indicate that the failure sequence of the components in the composite frame follows the order of tensile yielding of the tension-only bracing,cracking at the ends of the glulam columns,and failure of the hold-down connections of the CLT wall.The tensiononly bracing primarily functions during the elastic phase of the composite frame,while the CLT wall bears more than 50%of the horizontal force during the elastic-plastic phase of the composite frame.The finite element results indicate that when the lateral stiffness ratio between the CLT wall and the tension-only braced frame exceeds 0.055,the proportion of horizontal load borne by the CLT wall exceeds 25%.Additionally,when the rotational stiffness ratio between the CLT wall and steel coupling beam ranges from 0.52 to 0.84,the composite frame can maintain a strong column-weak beam failure mode while fully utilizing the load-bearing capacity of the CLT wall.
作者
高原
宋晓滨
GAO Yuan;SONG Xiaobin(Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education,Tongji University,Shanghai 200092,China;Department of Structural Engineering,Tongji University,Shanghai 200092,China)
出处
《建筑结构学报》
北大核心
2025年第2期39-49,共11页
Journal of Building Structures
基金
国家自然科学基金项目(52178243)。
关键词
钢-木混合结构
正交胶合木
柔性支撑
拟静力试验
协同抗侧性能
steel-wood hybrid structure
cross-laminated timber
tension-only brace
quasi-static test
synergistic lateral resistance performance
