考虑叠合面滑移的新型拼缝叠合板受力性能的有限元分析

为了优化双向受力钢筋桁架混凝土叠合板的拼缝构造方案,提高叠合板拼缝处的受力性能,本文设计了一种新型口袋式拼缝形式的叠合板。由于新旧混凝土叠合面容易发生相对滑移,从而影响板的整体承载力,因此本文利用有限元法研究其受力性能时考虑了叠合面滑移。通过对现浇板、密拼式叠合板和新型口袋式叠合板的数值分析,研究拼缝构造形式、现浇层厚度和附加钢筋对叠合板受力性能的影响。研究结果表明：新型口袋式拼缝形式可以使叠合板具有较好的承载能力,并保证了预制层和现浇层混凝土之间力的有效传递；增加现浇层混凝土厚度能够有效提高叠合板的承载力；附加钢筋配筋率对叠合板承载力影响也尤为明显,叠合板承载力在一定范围内随附加钢筋的配筋率的增加而提高。

Finite Element Analysis of the Stress Performance of a New Pocket-type Connected Composite Slab Considering the Slip of the Composite Surface

In order to optimize the joint scheme of bidirectional loading truss reinforced concrete composite slab and improve its stress performance at the joint position, a new type of composite slab with the pocket joint is designed in this paper. Relative slip is easy to occur between the new and old concrete combined interface, which influence the global bearing capacity of the truss reinforced concrete composite slab, therefore, the composite surface sliding is considered in the stress performance studying of truss reinforced concrete composite slab using the finite element method in this paper. The influences of connection modes, thickness of cast-in-place layer and additional reinforcement on stress performance of composite slab are studied according to the numerical analysis of the cast-in-situ slab, composite slab connection without gaps and pocket joint composite slab. The results show that the new pocket joint can make the bearing capacity of truss reinforced concrete composite slab better, and guarantee the effective transmission of the force between the precursor layer and cast-in-place floor concrete, adding cast-in-place layer thickness can effectively improve the bearing capacity of a truss reinforced concrete composite slab, and the influence of additional reinforcing ratio on truss reinforced concrete composite slab bearing capacity is particularly obvious as well, so the bearing capacity of the slab increases with the increase of the additional reinforcement ratio within limits.