(中国建筑西南设计研究院有限公司, 成都 610042)

摘要: 通过 11 块密拼叠合板试件的单向拟静力试验,对接缝处的平面内直剪承载力进行了研究;同时使用分层壳单元,对密拼叠合板水平荷载作用下的平面内直剪承载力、竖向荷载作用下的导荷方式等进行了数值分析。 结果表明:密拼叠合板平面内直剪承载力随后浇层厚度、接缝处连接钢筋配筋率的增大而增大;竖向荷载作用下,密拼叠合板在弹性阶段,竖向导荷可等同于现浇板,但承载力计算时跨中和支座弯矩需进行调整;长期荷载作用下其挠度可取现浇板挠度值乘以不小于 1. 1 的增大系数。 最后,将研究成果应用于密拼叠合板的设计实践中。

关键词: 叠合板; 密拼整体式接缝; 接缝传力机理; 平面内直剪承载力; 拟静力试验

中图分类号:TU375. 2 文献标志码:A 文章编号:1002-848X(2022)13-0007-08

DOI:10. 19701 / j. jzjg. XNY2028

Research and engineering application on direct shear performance at the joint of composite slab connected without gaps DENG Shibin, DONG Bo, BI Qiong,

WEI Bochen, LEI Yu, WU Jing, XU Mingjiao

(China Southwest Architectural Design and Research Institute Co. , Ltd. , Chengdu 610042, China)

Abstract:Through the one-way pseudo-static test of 11 composite slabs connected without gaps specimens, the in-plane direct shear bearing capacity of the joints was studied. At the same time, the layered shell element was used to carry out numerical analysis of the in-plane direct shear bearing capacity of composite slab connected without gaps under horizontal load and the way of guiding the load under vertical load. The results show that the direct shear bearing capacity in the plane of the composite slab connected without gaps increases after the thickness of the pouring layer and the reinforcement ratio of the connecting steel bar at the joint increase; under the action of vertical load, the composite slab connected without gaps is in the elastic stage, and the vertical guided load can be equivalent to cast-in-place slab, but the bending moments of the mid-span and the support need to be adjusted when the bearing capacity is calculated; under long-term load, its deflection can be taken as the deflection of the cast-in-place slab multiplied by an increase factor not less than 1. 1. Finally, the research results are applied to the design practice of composite slab connected without gaps.

Keywords:composite slab; monolithic joint connected without gaps; mechanism of joint force transfer; in-plane directnshear bearing capacity; pseudo-static test