暗梁式全预制板连接结构受弯性能研究

Research on Flexural Performance of Fully Prefabricated Slabs Connected with Dark-beam

目的提出一种暗梁式全预制板-板连接结构,并研究其力学性能,为该结构的设计提供依据。方法采用ABAQUS对暗梁式全预制板-板连接结构受力过程进行有限元分析,研究暗梁式连接方式的可行性,分析新旧混凝土之间摩擦系数、连接处混凝土强度、拼缝宽度等参数对结构力学性能的影响。结果采用上述连接结构具有更强的抗弯承载力,较现浇式提高了3.8%;新旧混凝土之间摩擦系数和抗剪钢条强度对承载力几乎无影响;增加连接处混凝土强度、拼缝宽度和抗剪钢条厚度对承载力影响很小,最大相差不足4%;抗剪钢条长度和截面高度对承载力有一定影响,最大相差超过5%。结论采用暗梁式板-板连接结构具有可行性,且抗剪钢条长度和截面高度对结构受弯承载力影响相对较大。

In this paper,a fully prefabricated slabs connected with dark-beam was proposed,and the mechanical properties of it was studied.The load-bearing process of the structure was analyzed by ABAQUS,and the feasibility of such connection form was studied.How the parameters influence the mechanical property was analyzed,such as the friction coefficient between the old and the new concrete,the concrete strength at the connection area,the width of the stitching gap,etc.Compared with the cast-in-place slab,the slab connected by the above manner has higher bending capacity by 3.8%.The friction coefficient between the new and the old concrete and the strength of shear resistant steel slab(SRSS)has little effect on the bearing capacity.Increasing the concrete strength at the connection,the width of the stitching gap and the thickness of SRSS has little effect on the bearing capacity,and the maximum difference of them is less than 4%.The length and the section height of SRSS has a certain influence on the bearing capacity,and the maximum difference is more than 5%.The results show that the fully prefabricated slabs connected with dark-beam is feasible,and the length or the section height of SRSS has relatively large influences on the bending capacity of it.