(1 中国矿业大学力学与土木工程学院, 徐州 221116; 2 东南大学交通学院, 南京 211189;3 江苏省土木工程环境灾变与结构可靠性重点实验室, 徐州 221116;4 江苏建筑节能与建造技术协同创新中心, 徐州 221116)

摘要: 提出两种预制底板不伸出钢筋的新型拼缝,即阶梯拼缝和弧形螺栓拼缝,并针对两种新型拼缝和后浇带拼缝开展了混凝土叠合板试件的静力加载试验. 通过试件的破坏过程和形态、应变分布特征、荷载-挠度曲线、特征荷载值的对比,研究了后浇层厚度、拼缝附加钢筋的配筋设置、拼缝形式对叠合板受弯性能的影响. 结果表明:两种新型拼缝可以防止拼缝处的裂缝沿叠合面横向发展而过早破坏;抗弯刚度和承载力随钢筋屈服强度的增大及后浇层厚度的增大而增大;阶梯拼缝板可以达到与后浇带拼缝板一样的受弯性能. 结合试验数据,提出了两种新型拼缝的配筋设计方法.

关键词: 混凝土叠合板; 拼缝; 静力试验; 承载力

中图分类号:TU375. 2 文献标志码:A 文章编号:1002-848X(2023)05-0083-07

DOI:10. 19701 / j. jzjg. 20201318

Experimental study on bending performance of concrete composite slabs using new connection joints without extended bars

XIAO Yu1,2, LI Xian1,3,4

(1 School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China;2 School of Transportion, Southeast University, Nanjing 211189, China; 3 Jiangsu Key Laboratory of EnvironmentalImpact and Structural Safety in Civil Engineering, Xuzhou 221116, China; 4 Jiangsu Collaborative Innovation Centerfor Building Energy Saving and Construction Technology, Xuzhou 221116, China)

Abstract: Two new connection joints that do not extend the reinforcement on the prefabricated slabs, namely stepped jointand arc bolt joint, were proposed, and the static loading tests of concrete composite slab specimens with two new connectionjoints and post-pouring belt joints were carried out. By the comparison of the failure process and damage states, straindistribution characteristics, load-deflection curves and characteristic load values of the specimens, the influences of thethickness of post-pouring layer, the setting of the additional reinforcement at joints and the form of the joint on the bendingperformance of composite slabs were studied. The results show that the two new connection joints avoid the early failureresult from cracks along the transverse direction at laminated face. The bending stiffness and bearing capacity increase withthe increase of yield strength of reinforcement and the thickness of post-cast layer. The slab with stepped joint can achievethe same bending performance as the slab with post-cast joint. Based on the test data, the reinforcement design methods oftwo new connection joints were proposed.

Keywords:concrete composite slab; connection joint; static test; bearing capacity

∗国家自然科学基金面上项目(51978656),江苏建筑节能与建造技术协同创新中心开放基金( SJXTLX1704),徐州重点研发项目(KC19207).

第一作者:肖宇,博士研究生,主要从事结构工程和地下工程研究,Email: 1105160506@ qq. com.

[引用本文] 肖宇,李贤. 新型不出筋拼缝混凝土叠合板受弯性能试验研究[ J]. 建筑结构,2023,53(5):83-89.XIAO Yu,LI Xian. Experimental study on bending performance of concrete composite slabs using new connection jointswithout extended bars[J]. Building Structure,2023,53(5):83-89.