（河南工业大学土木工程学院， 郑州 450001）

［摘要］在分布式连接全装配式RC楼盖体系（DCPCD）中，板与板之间通过连接件连接以提高楼盖的竖向承载力和平面内刚度。为研究DCPCD的竖向承载力和变形特性，在试验的基础上基于正交各向异性弹性薄板小挠度理论，分析了四边简支条件下DCPCD的竖向承载性能和挠曲变形规律； 并以板缝数量、连接件数量和楼盖跨度等为主要影响因素进行了参数分析。分析结果表明：DCPCD具有较大的竖向承载力和刚度，楼盖挠曲变形在顺板向、横板向基本一致，分布均匀且基本对称，变形规律与双向板楼盖类似，说明DCPCD具有双向板楼盖的受力和变形特征； DCPCD挠度的计算值与试验值吻合较好，验证了理论计算方法的可行性。增加连接件、减少预制板数量可有效提高楼盖竖向承载力和刚度，奇数预制板方案较偶数预制板方案有更大的竖向承载力和刚度，因此，在运输和安装等条件允许的情况下，建议采用宽板预制方案和奇数预制板结构布置方案。

［关键词］分布式连接； 全装配式RC楼盖； 板缝连接件； 横板向弯曲刚度； 竖向承载性能

中图分类号：TU375-2文献标识码：A文章编号：1002-848X(2020)20-0090-07

Analysis of vertical bearing capacity of four-sided simply supported precast RC floors

PANG Rui, DUAN Jinru, ZHANG Yibo, YANG Yijie

(College of Civil Engineering and Architecture, Henan University of Technology, Zhengzhou 450001, China)

Abstract:In the distributly connected  precast RC floor diaphragm system(DCPCD), slab joints are connected by connectors to enhance the vertical bearing capacity and in-plane stiffness of DCPCD. The vertical bearing capacity and flexural deformation law of DCPCD under the condition of simple four-sided support were analyzed based on the experiment and the small deflection theory of elastic thin perpendicular heterogeneous slabs to study the vertical bearing capacity and deformation characteristics of DCPCD. In addition, parameter analysis was carried out with the main influencing factors such as the number of slab joints, the number of connectors and the slab span. The result shows that DCPCD has a large vertical bearing capacity and stiffness. The flexural deformation of the slab is basically the same in both slab laying direction (SLD) and orthogonal slab laying direction (OSLD), and the distribution is uniform and basically symmetrical, and the deformation law of DCPCD is similar to that of  two-way slab, which indicates that DCPCD has the mechanism and deformation characteristics of two-way slab. The calculated value of DCPCD deflection is in good agreement with the experimental value, which verifies the feasibility of the theoretical calculation method. Adding connectors and reducing the number of precast slabs can effectively improve the vertical bearing capacity and stiffness of DCPCD. The odd number precast slabs scheme has greater vertical bearing capacity and stiffness than the even number precast slab scheme. Therefore, if the transportation and installation conditions permit, it is recommended to adopt the wide slab precast scheme and the odd precast slab structure layout scheme.

Keywords:distributed connection; precast RC floor; slab joint connector; transverse bending stiffness; vertical bearing capacity

*国家自然科学基金(51778214)，中原千人计划支持项目（ZYQR201912170），河南省属高校基本科研业务专项基金（2017RCJHO4）。

作者简介：庞瑞，博士，副教授，硕士生导师， Email：seupangrui@163.com。