（1 东莞理工学院生态环境与建筑工程学院， 东莞 523808； 2 广东华坤建设集团有限公司， 东莞 523075）

［摘要］对3块钢筋桁架混凝土叠合单向楼板进行吊装工况试验、正常使用状态下堆载试验，其中2块为运输过程中导致开裂的叠合板，1块无裂缝的叠合板作为参照，探究3块板在吊装工况下板底裂缝宽度、裂缝发展与应变变化情况。根据叠合板使用功能要求确定荷载，通过堆载试验模拟完全浇筑后叠合板在正常使用荷载作用下板底挠度、裂缝宽度、板底应变发展情况。采用中国规范混规GB 50010—2010、水工规范SL 191—2008及美国规范ACI 318-08 中的三种弯曲刚度计算方法预测堆载挠度并分析其计算精度。结果表明：吊装前后叠合板原有损伤不断累积，对板体造成不可恢复的损伤。堆载作用下开裂叠合板能够满足规范正常使用条件下的跨中挠度要求，但局部区域裂缝宽度无法满足。三种弯曲刚度下的挠度理论计算结果均与试验结果有较大误差，其中GB 50010—2010计算结果与试验叠合板跨中挠度数据吻合相对较好，针对叠合板的挠度预测还需进一步研究。

［关键词］带裂缝混凝土叠合板；钢筋桁架；裂缝开展；挠度计算；堆载试验

中图分类号：TU375，TU317+.1文献标识码：A文章编号：1002-848X(2021)05-0086-06

Research on mechanical properties of reinforcement truss concrete laminated slab with cracks

XIA Lipeng1, ZHOU Shengguang2, LI Jinghua2, ZHANG Lifei1, DI Bo1, ZHENG Yu1

(1 School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China;2 Guangdong Huakun Construction Group Corporation Limited, Dongguan 523075, China)

Abstract:Three reinforcement truss concrete laminated one-way slabs were tested under hoisting and serviceability limit states. Two of them are laminated slabs that caused cracks during transportation and one  laminated slab without cracks was used as a reference. The crack width, crack development and strain variation of the three slabs under hoisting condition were investigated. The load was determined according to the functional requirements of laminated slabs, and the development of the bottom deflection, crack width, and bottom strain of the slab after casting concrete of the above layer under the normal use load was simulated by the surcharge loading test. Three bending stiffness calculation methods in Chinese standard concrete code GB 50010—2010, hydraulic code SL 191—2008 and American standard ACI 318\|08 were used to predict the stacking deflection and the accuracy of calculation was analyzed. The results show that the original damage of the slab before and after hoisting continues to accumulate and some residue damage can not recover. The mid-span deflection of the laminated slab with cracks under the surcharge load can meet the requirements of the specification under normal use conditions, while few cracks width in the local area can not meet the width limitation. The deflection theoretical calculation results under the three bending stiffenesses all  have large errors with the test results. The results of GB 50010—2010 have a better agreement with the mid-span deflection of the test laminated slabs, further study need to be developed to give an accurate calculation method of laminated slab deflection.

Keywords:concrete laminated slab with crack;reinforcement truss;crack development;deflection calculation;surcharge loading test

*东莞市社会科技发展重点项目（20185071401603）。

作者简介：夏立鹏，硕士，工程师，Email:xialp@dgut.edu.cn；通信作者：郑愚，博士，教授，Email:zhengy@dgut.edu.cn。