(1 龙信建设集团有限公司， 南通 226000； 2 中国建筑第八工程局有限公司， 上海 200135；3 同济大学土木工程学院， 上海 200092) 

［摘要］为研究密拼钢筋桁架混凝土叠合双向板的受力性能，进行了2块四边简支边界下的3.6m×3.6m叠合板堆载试验，研究了板的破坏模式、拼缝传力、刚度及承载力。试验结果表明：2个试件具有相似的破坏模式，板底裂缝形态均呈“米”字形，与现浇板存在差异；密拼接缝两侧按《钢筋桁架混凝土叠合板应用技术规程》（T/CECS 715—2020）要求配置桁架钢筋，能保证拼缝搭接钢筋有效传力，实现了板的双向受力；屈服荷载前，增加拼缝搭接钢筋可提高双向板的整体刚度；密拼试件的承载力实测值均不低于采用弹性薄板小挠度理论和极限平衡法计算的承载力。 

［关键词］装配式混凝土结构；密拼叠合双向板；钢筋桁架；堆载试验；裂缝；受力机理 

中图分类号：TU375-2 文献标识码：A文章编号：1002-848X(2021)23-0111-09

Experimental research on heap loading of reinforced concrete composite two-way slab with lattice girders and connected without gap  

CHENG  Zhijun1,  MA  Zhizhou1,  HU  Jie1,  YU  Shaole2,  ZHAO  Yong3 

(1 Longxin Construction Group  Co., Ltd., Nantong 226000， China； 2 China Construction Eighth Engineering Division  Co., Ltd., Shanghai 200135， China； 3 College of Civil Engineering, Tongji University, Shanghai 200092， China) 

Abstract: In order to investigate the mechanical performance of reinforced concrete composite two-way slab with lattice girders and connected without gap, the heap loading test of two 3.6m×3.6m composite slabs under the boundary condition of simply supported on four sides were carried out to study the failure mode, force transmission of joint, stiffness and bearing capacity. The result indicate that, the failure modes of two specimens are similar, and the cracks at the bottom of two slabs are both in the shape of "rice" in Chinese characters, which is different from the cast-in-place slabs. The lattice girders connected without gap configured according to the requirements of Technical specification for concrete composite slabs with lattice girders (T/CECS 715—2020) on each side of the seam can ensure reliable force transmission of overlapped bars, which realized the bidirectional loading of the slabs. Before yielding load, the stiffness of two-way slabs can be improved by adding overlapped bars. The actual bearing capacity of the specimens connected without gap are not lower than the bearing capacity calculated by the theory of small deflection of elastic thin plates and the limit equilibrium method. 

Keywords:fabricated concrete structure; composite two-way slab connected without gap； lattice girder； heap loading test； crack； mechanical mechanism

作者简介：程志军，博士，研究员，Email:chengzhijun123@139.com； 通信作者：赵勇，博士，副教授，Email:yongzhao@tongji.edu.cn。