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端拼缝叠合楼板受力性能试验研究*
刘运林1,2,叶献国2,种迅2,丁克伟1,邢伟3
摘 要

1 安徽建筑大学土木工程学院, 合肥 230601 2 合肥工业大学土木与水利工程学院, 合肥 2300093 西伟德宝业混凝土预制件(合肥)有限公司, 合肥 230601

 

[摘要]现有叠合楼板设计时垂直拼缝方向不考虑承受外荷载作用,导致成本增加和不符合实际的受力情况。通过不同构造形式的叠合楼板试验,研究不同构造处理形式的拼缝叠合楼板在竖向单调荷载作用下的受力特性,观察叠合楼板试件从裂缝开始出现到破坏状态的全过程,分析试件在各级荷载下挠度、抗弯承载力变化及拼缝处钢筋应力传递变化情况。结果表明:拼缝处未设附加约束的叠合楼板具有一定的承载能力,但搭接纵筋超过屈服荷载后,会产生脆性断裂破坏;当设置格构钢筋约束时,能够保证拼缝处钢筋的有效传力,且具有较高的延性,叠合楼板承载力即为拼缝处截面承载力。

[关键词]叠合楼板; 拼缝连接; 格构钢筋

中图分类号:TU375.2    文献标识码:A    文章编号:1002-848X(2015)04-0085-05

 

Experimental study on mechanical performance of composite slab with end joints

Liu Yunlin 1,2, Ye Xianguo2, Chong Xun2, Ding Kewei1, Xing Wei3

 (1 School of Civil Engineering, Anhui Jianzhu University, Hefei 230601, China

2 School of Civil Engineering,  Hefei University of Technology, Hefei 230009 China;3 Sievertbaoye Precast Concrete Co., Ltd., Hefei 230601, China)

 

Abstract:

In the existing composite slab  design, joints are not considered to subject external loads in the vertical direction, leading to the increase of cost and unreal mechanical conditions. Through tests on composite slab with different structural forms, mechanical characteristics of the composite slab under vertical monotonic loads were studied. The whole process from appearance of crack to failure of composite slab specimens was observed. The deflection, flexural carrying capacity change and rebar stress transfer conditions in the joints were studied under all levels of loads. The results show that composite slab without additional constraints in joints has certain bearing capacity but brittle failure is to happen when overlapping longitudinal rebar exceeds the yield load. Effective force transmission and high ductility are ensured with lattice rebar restraint, and the bearing capacity of composite slab is the bearing capacity of joint connection.

Keywords:composite slab joint connection lattice rebar

 

*国家自然科学基金(5090807151278519,高校省级优秀青年人才基金(2012SQRL271,安徽省重点实验室计划项目(1106c0805024,博士科研启动基金,安徽省自然科学基金资助项目(1408085MKL45)。

作者简介:刘运林,博士,副教授,一级注册结构工程师,Emailae1933@126.com

 

参考文献

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