钢-混凝土组合梁附加挠度的能量法分析

Energy analysis of the additional deflection of steel-concrete composite beams

钢梁与混凝土之间的相对滑移使钢-混凝土组合梁刚度降低,变形增大。文章从能量的角度,提出滑移效应下剪力连接件应变能公式;建立了钢-混凝土组合梁应变性能分析的微分方程;并对集中荷载下简支梁的挠曲线进行了实例求解;与换算截面法和有限元分析结果比较,验证了通过能量法求解滑移效应下组合梁挠度的可行性。

The slip effect on the interface between the steel beam and the concrete flange has an evident contribution to the deformation of composite steel-concrete beams and reduction of the rigidity of the beams. In this paper, the differential equation of the deformation behavior is derived from energy analysis. The stress energy of shear connectors, such as studs, is studied, and a definite formula is presented to account for stress energy. A simply supported beam under the concentrated load is calculated by using the differential equation, and the results are compared with the results of the ＂transformed section method＂ and the finite element method, which verifies that energy analysis is feasible for the composite beam under the slip effect.