摘要
为研究带密拼式整体接缝的钢筋桁架混凝土叠合板(简称“密拼叠合板”)的裂缝、破坏形态、承载力和刚度等受弯性能,进行了22个密拼叠合板单调加载试验,并与6个整浇板试验进行对比,分析了钢筋桁架位置、后浇层厚度、连接纵筋配筋及拼缝数量等参数对密拼叠合板受弯性能的影响规律以及叠合面发生撕裂的原因。结合试验和相关文献的39组试验数据,经统计分析拟合得到叠合板密拼缝处的受弯承载力以及板底拼缝展开宽度计算式。结果表明:密拼叠合板的损伤主要集中在拼缝处,并在拼缝附近叠合面出现水平撕裂现象;密拼叠合板的受弯承载力和刚度低于相应整浇板的,增加后浇层厚度及连接纵筋能减少二者差距;钢筋桁架可以抑制叠合面的撕裂,且距离拼缝越近抑制效果越好;双拼缝密拼叠合板的受弯性能优于单拼缝密拼叠合板的;按拟合计算式计算的受弯承载力和板底拼缝展开宽度与试验值符合较好,二者之比平均值分别为1.004和1.023,变异系数分别为0.025和0.134;按GB/T 50010—2010《混凝土结构设计标准》计算的短期受弯刚度与试验值符合较好,二者之比平均值为0.903,变异系数为0.115。
In order to investigate the flexural performance of the concrete composite slab with lattice girders without gaps,including cracks,failure modes,bearing capacity,and stiffness,22 monotonic loading tests were conducted on the composite slabs and compared with six tests on full-cast slabs.The study analyzed the influence of key factors,including the position of the lattice girders,the thickness of the post-cast layer,the reinforcement of connecting bars,and the number of joints,on the flexural performance of composite slabs and the causes of tearing on the composite surface.Experimental data of related literature were collected and combined with the data from this study.Based on the 39groups of test data,modified formulas were established for calculating the flexural bearing capacity and the expanded width of the joint at the bottom of composite slabs.The results indicate that the damage of composite slabs is primarily concentrated at the joints,exhibiting horizontal tearing along the composite interface.The flexural bearing capacity and stiffness of the composite slabs are lower than those of the corresponding full-cast slabs,but the disparity can be reduced by increasing the thickness of the post-cast layer and the reinforcement of connecting rebars.Lattice girders effectively suppress interfacial tearing,and their efficacy improves as they are positioned closer to thejoints.Specimens with double joints demonstrate better performance than those with a single joint.The calculations using the proposed method for flexural bearing capacity and the expanded width of the joint agree well with the experimental results,yielding mean calculated-to-experimental ratios of 1.004 and 1.023,and variation coefficients of 0.025 and 0.134,respectively.Furthermore,the short-term flexural stiffness calculated according to GB/T 50010-2010"Standard for design of concrete structures"aligns well with the experimental results,with a mean calculated-to-experimental ratio of 0.903 and a coefficient of variation of 0.115.
作者
赵勇
李广汇
高志强
余泳涛
程志军
ZHAO Yong;LI Guanghui;GAO Zhiqiang;YU Yongtao;CHENG Zhijun(College of Civil Engineering,Tongji University,Shanghai 200092,China;China Institute of Building Standard Design&Research,Beijing 100191,China;Longxin Construction Group Co.,Ltd,Nantong 226100,China)
出处
《建筑结构学报》
北大核心
2025年第11期82-95,共14页
Journal of Building Structures
基金
国家重点研发计划项目(2016YFC0701900)。
关键词
叠合板
密拼式整体接缝
钢筋桁架
静力试验
受弯性能
composite slab
monolithic connection without gap
lattice girder
static loading test
flexural performance
