（1 浙江工业大学工程设计集团有限公司， 杭州 310014； 2 浙江浙工大检测技术有限公司， 杭州 310014； 3 浙江工业大学建筑工程学院， 杭州 310014）

［摘要］在实际工程中对四边不出筋、板侧采用密拼连接的钢筋桁架叠合双向板和对应的现浇楼板开展了原位加载对比试验，研究了该类型叠合板在实际应用时的挠度、裂缝、承载力等受力特性。对比试验结果表明：叠合板在竖向荷载作用下的各项受力特性均表现出较为明显的双向板特征，能满足正常使用极限状态与承载能力极限状态的要求；叠合板的板底开裂荷载大于现浇板，相同荷载作用下叠合板挠度约为现浇板挠度的1/2，叠合板的整体抗弯刚度明显大于现浇板，在正常使用极限状态荷载值作用下叠合板的拼缝处未开裂。

［关键词］密拼连接； 钢筋桁架； 叠合双向板； 原位试验

中图分类号：TU375文献标识码：A文章编号：1002-848X(2019)23-0113-05

Comparative experimental study on in-situ loading of the superimposed two-way slabs without extending the reinforcement on all sides and connected without gap

Zhang Xuefeng1，2， Zheng Shuguang1， Shan Yuchuan1， Zhou Xiaoyue1， Chen Dong3

（1 Zhejiang Design Group Co., Ltd.， Zhejiang University of Technology， Hangzhou 310014, China；2 Testing Technology Co.， Ltd of Zhejiang University of Technology， Hangzhou 310014, China；3 College of Civil Engineering， Zhejiang University of Technology， Hangzhou 310014, China）

Abstract:In an actual construction project, a comparative in-situ loading test was carried out between two types of slab. One type is the steel bar truss superimposed two-way slab that has no extended reinforcement on all sides and are connected without gap, and the other type is the cast-in-place slab. The properties of superimposed two-way slab were studied including its deflection, crack development, bearing capacity in practical application. By comparing the test results of the superimposed slab and the cast-in-place slab, it can be seen that under the vertical load, the various force characteristics of the superimposed slab all fit into typical two-way slab features, which meet the requirements of the serviceability limit states and the ultimate limit states. In addition, the cracking load at the bottom of the superimposed slab and its overall bending stiffness are greater than those of the cast-in-place slab, while the deflection of the superimposed slab is half of the deflection of  the cast-in-place slab under the same load. When given the load value of the serviceability limit states, no crack has been found at the seam of the superimposed slabs.

Keywords:connection without gap; steel bar truss; superimposed two-way slab; in-situ test