（1扬州市市政设施管理处， 扬州 225000； 2 扬州大学建筑科学与工程学院,  扬州 225127)

［摘要］为研究混凝土-砖砌体组合托换梁的受剪性能，制作了2 种不同组合形式、3种不同连接筋间距共7根混凝土-砖砌体组合托换梁进行静载试验。试验研究表明，组合托换梁构造可靠，混凝土梁与砖砌体可保持良好的整体性共同工作。根据桁架-拱模型，推导了混凝土-砖砌体组合托换梁的受剪承载能力计算公式。基于现行规范的混凝土梁斜截面受剪承载力计算公式，提出了混凝土-砖砌体组合托换梁受剪承载力简化计算公式。理论公式与简化公式计算得到的结果与试验实测值均吻合较好，且简化公式计算简单、方便，可适用于工程实践。

［关键词］混凝土梁； 砖砌体； 托换梁； 受剪性能； 试验研究

中图分类号：TU375-1文献标识码：A文章编号：1002-848X(2017)09-0059-06

Study on the shear behaviors of composite component of concrete-masonry underpinning beams

Jiang Xiaoqin1, Cao Dafu2, Ge Wenjie2, Wang Songrong2

(1 Yangzhou Municipal Facilities Management Office, Yangzhou 225000, China; 

2 College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China)

Abstract:In order to study the shear behaviors of composite component of concrete-masonry underpinning beams, seven composite components with two different combination forms and three different connect reinforcement spacing were made and the static shear experiment were carried out. The experimental results show that the construction of composite components is reliable, concrete beam and masonry beam can work together as an integrity component. Taking truss-arch model as reference, the shear capacity theoretical calculate formula of composite component was derived. According to reinforced concrete beams oblique plane shear capacity calculate formula of current design code for concrete structure, a simplified calculate formula of shear capacity of composite component was given. The results show that theoretical formula and simplified calculate formula were agree well with experimental value. The using of proposed simplified formula is very convenient, which could be used for engineering practice.

Keywords:concrete beam; masonry; underpinning beam; shear behavior; experimental study

*国家自然科学基金资助项目(51578478, 51278445)。

通讯作者：曹大富，硕士，教授，Email: dfcao@yzu.edu.cn。