（1 筑友智造建设科技集团有限公司， 长沙 410000； 2 湘潭大学土木工程与力学学院， 湘潭 411105）

［摘要］结合现浇楼板与叠合楼板的优点，提出了一种新型预制整浇拼合楼板，为了研究该新型预制整浇拼合楼板的破坏形态、受弯性能、短期刚度，以板厚、配箍方式、预埋PVC数量等为变量设计了6个试件，并与2个现浇试件进行对比。通过对试件进行静力加载试验所得的荷载-位移曲线及板内箍筋应变变化情况的分析，表明：新型预制整浇拼合楼板较现浇楼板具有更高的承载力；拼合楼板的现浇部分配置环箍的受力性能比配置开口箍+底筋以及双折开口箍的受力性能更佳；拼合楼板现浇部位埋置PVC管会降低其承载力和刚度；拼合楼板在拼缝处存在一个薄弱面，应增加此处的构造措施。

［关键词］预制楼板；拼合楼板；装配式楼板；静力试验；受弯性能； 短期刚度

中图分类号：TU375-2文献标识码：A文章编号：1002-848X(2021)05-0092-06

Experimental study on flexural performance of new type of precast cast-in-situ composite floor slab

LIAO Zhiqiang1, NI Jiagui2, YU Dayou 1, CHEN Jun2, LIAO Zhenying1, CHEN Fuliang 1

(1 DIT Group Limited, Changsha 410000, China;  2 College of Civil Engineering and Mechanics， Xiangtan University, Xiangtan 411105, China)

Abstract:Combining the advantages of cast-in-situ floor slab and laminated floor slab, a new type of precast cast-in-situ composite floor slab was proposed. In order to study the failure mode, flexural performance and short-term stiffness of the new type of precast cast-in-situ composite floor slab, six specimens were designed based on variables such as the thickness, stirrup reinforcement method, and the number of embedded PVC pipes, and which were compared with two cast-in-place specimens. The analysis of the load-displacement curve obtained by the static loading test on the specimens and the strain change of the stirrup in the slab shows that:  the new type of precast cast-in-situ composite floor slab has a higher bearing capacity than that of the cast-in-place floor slab; the mechanical performance of the cast-in-place part of the composite floor slab with ring stirrup is better than that with opening stirrup + bottom reinforcement bar and double folding opening stirrup; the bearing capacity and stiffness will be reduced if PVC pipes are embedded in the cast-in-place part of the composite floor slab; there is a weak surface in the joint of the composite floor slab, and the structural measures should be added.

Keywords:precast slab;composite slab;prefabricated slab;static test;flexural performance; short-term stiffness

*湖南省自然科学基金(2019JJ60047)， 湖南省重点研发(2018WK2110,2018WK2111)， 湖南省科技专项 (2017XK2048)，“科技助力经济2020”重点专项（SQ2020YFF0426587）。

作者简介：廖智强，博士，高级工程师, Email： liaozhiqiang77@163.com；通信作者：陈甫亮，硕士，工程师，一级建造师，Email:1019549361@qq.com。