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REINFORCED CLOSE JOINT CONSTRUCTION MEASURES OF SUPERIMPOSED SLABS AND ITS FLEXURAL PERFORMANCE SIMULATED BY FEM
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摘要: 为了优化密拼叠合楼板的拼缝构造，深入分析叠合楼板拼缝处的受弯性能，提出了3种加强型密拼拼缝构造，基于3种构造的叠合楼板静力试验，利用ABAQUS软件对试验试件进行非线性有限元分析，并与试验结果进行对比。结果表明：有限元分析得到的叠合楼板裂缝分布、破坏模式、受弯承载力与试验结果吻合较好。在此基础上，对凹槽密拼叠合楼板抗弯承载力进行参数分析，研究拼缝钢筋配筋率、混凝土叠合层厚度、凹槽深度和拼缝钢筋搭接长度对叠合板承载力的影响及影响规律。研究结果表明：拼缝钢筋配筋率对叠合板承载力的影响最为明显，叠合板承载力随着配筋率的增大显著增加；增大混凝土叠合层厚度和预制板凹槽深度均可显著提高叠合板的承载能力，其中增大叠合层厚度的影响略大；拼缝钢筋搭接长度对叠合板承载力的影响主要表现在：当搭接长度小于1.4la（la为受拉钢筋锚固长度）时，承载力随着搭接长度的增大而增大，当搭接长度大于1.4la时，搭接长度对叠合楼板的承载力影响不明显。Abstract: In order to optimize the joint structure of superimposed slabs and analyze the flexural performance of the joint, three locally strengthened joint construction measures were proposed. Three specimens of the reinforced superimposed slabs were designed and tested under static load. The nonlinear finite element analysis of the specimens was carried out by ABAQUS software and compared with the test results. The results showed that the crack distribution, failure mode and flexural capacity of the superimposed slabs were in good agreement with the test results. Based on the finite element model, the parametric analysis of the flexural bending capacity were conducted on the superimposed slabs with groove joint. The influences of the reinforcement ratio, the thickness of the cast-in-place layer, the depth of the groove and the overlapping length of the joint reinforcement on the bearing capacity of the superimposed slabs were investigated.The results showed that the reinforcement ratio, the thickness of the cast-in-place layer and the depth of the groove had a significant impact on the bearing capacity of the superimposed slabs, and the overlapping length of the joint reinforcement had a impact on the bearing capacity of the superimposed slabs. When the overlapping length was less than 1.4la (1.4la was defined as the anchorage length of tensile bar), the bearing capacity increased with the increase of overlapping length. When the overlapping length was greater than 1.4la, there was little impact on the bearing capacity.
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Key words:
- close joint /
- bending performance /
- finite element analysis /
- parameter analysis
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