砌体房屋改底框结构中双梁托换体系现场试验研究  

Field test study on double beam underpinning system in modified bottom frame structure of masonry building

作　　者：林鹏 王志泉 王大军 安炳 邓维群 Lin Peng;Wang Zhi-quan;Wang Da-jun;An Bing;Deng Wei-qun(Gansu Civil Engineering Research Institute Co.Ltd,Lanzhou 730020,China;Gansu Institute Research Center of Building Durability Diagnosis and Treatment Engineering Technology,Lanzhou 730020,China;Gansu Institute of Architectural Design and Research Co.Ltd,Lanzhou 730000,China;College of Civil Engineering,Lanzhou Univ.of Tech,Lanzhou 730000,China)

机构地区：[1]甘肃土木工程科学研究院有限公司,甘肃兰州730020 [2]甘肃省建筑物耐久性诊治工程技术研究中心,甘肃兰州730020 [3]甘肃省建筑设计研究院有限公司,甘肃兰州730000 [4]兰州理工大学土木工程学院,甘肃兰州730000

出　　处：《工程抗震与加固改造》2022年第4期157-163,共7页Earthquake Resistant Engineering and Retrofitting

摘　　要：为满足既有砌体结构对底部大空间的需求,在将砌体结构改造为底框结构时,双梁托换技术应用广泛。文章结合工程实例对托换梁结构在底层砖混墙拆除后的力学性能进行了现场试验研究,现场测试了托换梁及夹心墙变形、托换梁钢筋和混凝土的应变数据。结果表明:一层砖混墙体拆除后在自重作用下托换梁跨中挠度较小,托换梁与夹心墙粘结性能良好;托换梁跨中正弯矩截面和支座负弯矩截面受拉钢筋应变和应力非常小;采用双托梁加肩梁的技术能够有效将二层以上的荷载传递至托换梁,且具有较高的安全性和较大的安全储备。In the masonry structure,due to the demand of large space at the ground floor,the masonry structure is transformed into the bottom frame structure,and the double beam underpinning technology is widely used.In this paper,the design of underpinning beam structure is experimented,and the deformation of underpinning beam,sandwich wall,reinforcement strain and concrete strain data of underpinning beam are tested in the field.The results show that the deflection in the middle span of the beam is small after the first layer of brick wall is removed,and the bond between the beam and the sandwich wall is good.The strain and stress of the tensile reinforcement of the positive bending moment section and the negative bending moment section are very small.The results show that the technology of double beam underpinning with shoulder beam can effectively transfer the load to the underpinning beam and has high safety and large safety reserve in engineering application.

关 键 词：双梁托换 砌体结构改造 底框结构 现场试验 托换梁挠度 

分 类 号：TUT46.3[建筑科学]