叠合板板侧凹槽拼缝连接受弯性能试验研究

Experimental study on flexural performance of composite slab with groove splicing joint

为了提高叠合板构件的工厂化制作、运输吊装及现场施工效率,研发了新型凹槽拼缝连接叠合板.通过对8个叠合板试件进行足尺受弯性能试验和数值模拟分析,对比研究整体现浇板、后浇带连接叠合板以及凹槽拼缝连接叠合板的开裂弯矩、极限承载力、裂缝开展及分布、变形延性和破坏特征等受弯性能.结果表明,凹槽拼缝连接叠合板的受弯承载力略低于整体现浇板及后浇带连接叠合板.相较于C型连接,D型连接凹槽拼缝叠合板的受弯性能更好.随着凹槽长度的增加,凹槽拼缝连接叠合板的承载能力有显著提高.建立的有限元模型数值模拟结果与试验结果吻合较好,可以较合理地模拟叠合板的受弯性能.通过对影响叠合板D型凹槽拼缝连接受弯性能的参数分析,明确了叠合板凹槽拼缝连接的合理设计.

A new composite slab with groove splicing joint was developed in order to improve the efficiency of factory production,transportation and lifting,as well as on-site construction of composite slab components.The flexural performance of cast-in-place slabs,composite slabs with post-cast strip and composite slabs with groove splicing joint was comparatively analyzed in terms of the cracking moment,flexural capacity,crack development and distribution,deformation ductility and failure characteristics through full-size flexural test and numerical simulation on 8 composite slab specimens.Results show that the flexural capacity of composite slabs with groove splicing joint is slightly lower than that of cast-in-place slabs and composite slabs with post-cast strip.The composite slabs using the D-type groove splicing joint have better flexural performance compared with the C-type connection joint.The flexural capacity of the composite slabs with groove splicing joint was significantly improved by increasing the length of the groove.The numerical simulation results of the established finite element model accorded well with the experimental results,which can reasonably simulate the flexural performance of composite slabs.The reasonable design of the composite slabs with groove splicing joint was clarified through the analysis of the parameters influencing the flexural performance of the composite slabs with D-type groove splicing joint.