榫-钉连接木-混凝土组合梁受弯性能试验研究  

Experimental study on flexural behavior of timber-concrete composite beams with notch-screw connections

作　　者：史本凯 刘伟庆[1,2] 杨会峰[2] 陶昊天 王超超 SHI Benkai;LIU Weiqing;YANG Huifeng;TAO Haotian;WANG Chaochao(School of Civil Engineering,Southeast Univeristy,Nanjing 211189,China;College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]东南大学土木工程学院,江苏南京211189 [2]南京工业大学土木工程学院,江苏南京211816

出　　处：《建筑结构学报》2021年第10期104-113,共10页Journal of Building Structures

基　　金：国家重点研发计划项目(2017YFC0703506);国家自然科学基金面上项目(51878344,51578284)。

摘　　要：为验证榫-钉连接的抗剪性能和组合性能,对榫-钉剪力连接件的推出试件以及采用该种连接的胶合木-混凝土组合梁分别进行了推出试验和弯曲试验。推出试验结果表明,榫-钉连接件的滑动刚度大、承载力高,同时也呈现出较为明显的脆性破坏。胶合木-混凝土组合梁由6个榫-钉剪力连接件连接。弯曲试验中测量了荷载、跨中挠度、木梁与混凝土板的应变以及端部和连接件处木梁与混凝土板的界面相对滑移。弯曲试验结果表明:木-混凝土组合梁的主要破坏模式为梁端木材的剪切破坏和木材的受弯破坏;采用榫-钉连接的木-混凝土组合梁的平均抗弯刚度达到了9.18×10^(12) N·mm^(2),较纯木梁提高了182.5%;其组合系数为69.7%,较传统螺钉连接的组合梁显著提升。因此,采用榫-钉连接的木-混凝土组合梁呈现出优异的抗弯刚度和承载力,有利于拓宽木-混凝土组合结构体系的应用范围,具有良好的应用前景。To evaluate the shear and composite performances of notch-screw connections,the push-out tests for notch-screw connections and bending tests for timber-concrete composite(TCC)beams with notch-screw connections were conducted.Push-out tests show that notch-screw connections provide larger slip stiffness and shear strength as well as unfavorable brittle failure mode.The timber-concrete composite beam specimens were connected using six notch-screw shear connections.The testing loads,mid-span deflection,regularity of strain distribution of all testing specimens and interfacial relative slip at beam-ends and connections of TCC beams were recorded during tests.The flexural test results show that the primary dominant failure modes of TCC beams are the shear failure at timber beam-ends and the flexural failure.The flexural stiffness of the TCC beam with six notch-screw connections reaches up to 9.18×10^(12) N·mm^(2),and is improved by 182.5%as compared with the timber beam.The composite efficiency is 69.7%,which is improved significantly as compared with TCC beam using traditional screwed connector design.Therefore,the TCC beam with notch-screw connections are characterized with excellent flexural stiffness and load bearing capacity,which is beneficial to broaden the application of TCC systems and has good prospects of practical application.

关 键 词：木结构 木-混凝土组合梁 榫-钉连接 推出试验 弯曲试验 受弯性能 

分 类 号：TU398.903[建筑科学—结构工程]