新型加肋钢筋桁架混凝土叠合板受弯性能试验研究

Experimental study on flexural performance of new ribbed steel truss concrete slab

设计制作了5块混凝土叠合板进行受弯性能试验,分析在均布荷载作用下混凝土板的破坏形态,研究加肋尺寸对预制板力学性能的影响。结果表明:叠合板加肋可明显提高预制板的刚度,初始刚度提升最大可达2.97倍,采用带肋板可有效解决预制板施工阶段挠度过大问题;同时混凝土肋对板的开裂荷载和抗弯承载力也有较大提升,开裂荷载最大提升幅度达到2倍,极限荷载提升幅度最大达4.18倍。在试验研究的基础上,给出了考虑上部受压作用的加肋钢筋桁架混凝土叠合板施工阶段短期刚度的计算公式,与试验结果较吻合。

Five concrete laminated panels were designed and produced for bending performance tests.The failure mode of the concrete panels under uniform load was analyzed,and the influence of rib size on the mechanical properties of prefabricated panels was studied.The results showed that the ribs of the laminated panels can significantly improve the stiffness of the prefabricated panels,and the maximum initial stiffness can be increased by up to 2.97 times.The use of ribbed plates can effectively solve the problem of excessive deflection during the construction stage of prefabricated panels.At the same time,the concrete ribs also greatly improve the cracking load and bending capacity of the panels,with the maximum increase in cracking load reaching 2 times and the maximum increase in ultimate load reaching 4.18 times.Based on the experimental research,a calculation formula for the short-term stiffness of ribbed steel truss concrete laminated panels considering the upper compression was proposed,which was in good agreement with the experimental results.