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

摘要: 根据已完成的四边不出筋密拼连接叠合双向板原位加载试验研究成果,分析了钢筋桁架叠合双向板与现浇板抗弯刚度、挠度存在差异的机理. 考虑弯矩调整、裂缝分布、支座附加筋及钢筋桁架等因素引入相关挠度折减系数对既有挠度计算方法进行修正. 基于 ACI318 有效惯性矩方法、修正 ASCE 方法对叠合双向板挠度进行理论计算得出,ACI318 有效惯性矩方法计算结果高估了叠合双向板弹性阶段刚度,修正 ASCE 方法适用于弹性阶段. 解析刚度法结合修正挠度计算方法可用于计算叠合双向板挠度,适用于叠合双向板弹性和塑性阶段,计算值与实测值吻合较好. 通过数值模拟开展参数分析得出,叠合双向板的抗弯刚度随现浇层与预制底板厚度比值的增大而提升明显,但钢筋桁架与支座附加筋等因素的刚度增强效应会减小.

关键词: 密拼连接; 叠合双向板; 有效惯性矩法; 解析刚度法; 挠度

中图分类号: TU375 文献标志码:A 文章编号:1002-848X(2023)11-0068-07

DOI:10. 19701 / j. jzjg. LS202098

Analysis of calculation method for deflection on composite two-way slabs connected without gap

CHEN Dong1,2, ZHANG Xuefeng2,3, XU Sifa1, FU Linfeng3, ZHU Xiaodan1, LI Huiming1

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

Abstract:Based on the comparative experimental study on in-situ loading of the composite two-way slabs that have noextended reinforcement on all sides and connected without gap, the mechanism of differences in flexural rigidity anddeflection between steel rebar reinforced truss composite two-way slabs and cast-in-place slabs was analyzed. Consideringfactors such as bending moment adjustment, crack distribution, additional steel rebar reinforcement of supports and steeltrusses, the relevant deflection reduction coefficient was introduced to modify the existing deflection calculation method.Based on the ACI318 effective moment of inertia method and the modified ASCE method to theoretically calculate thedeflection of the composite two-way plate, the calculation results of the ACI318 effective moment of inertia methodoverestimated the stiffness of the composite two-way plate in the elastic stage, and the modified ASCE method was suitablefor the elastic stage. The analytical stiffness method combined with the corrected deflection calculation method could beused to calculate the deflection of the composite two-way slab, which was suitable for the elastic and plastic stages of thecomposite two-way slab, and the calculated value was in good agreement with the measured value. Through numericalsimulation and parameter analysis, it is concluded that the flexural stiffness of the composite two-way slab increasessignificantly with the increase of the thickness ratio of the cast-in-place layer to the prefabricated floor, but the stiffnessenhancement effect of the steel rebar truss and the additional steel rebar reinforcement of the support will decrease.

Keywords:connected without gap; composite two-way slab; effective moment of inertia method; analytical stiffnessmethod; deflection

∗浙江省基础公益研究计划-桁架钢筋叠合双向板力学性能试验与多尺度精细化分析模型研究(LGF20E080019).

第一作者:陈东,硕士,主要从事钢筋桁架叠合双向板领域研究,Email:634507576@ qq. com.

[引用本文] 陈东,章雪峰,许四法,等. 密拼连接叠合双向板挠度计算方法研究[J]. 建筑结构,2023,53(11):68-74. CHEN Dong,ZHANG Xuefeng,XU Sifa,et al. Analysis of calculation method for deflection on composite two-way slabsconnected without gap[J]. Building Structure,2023,53(11):68-74.