简支组合梁混凝土翼缘剪力滞后效应分析

为了研究钢混凝土组合梁混凝土翼缘中的剪力滞后规律,对于不同类型荷载作用下的简支单向组合梁板体系,采用解析法并根据薄板理论,分别建立了翼缘板中面内应变和挠度的偏微分方程。根据简化的边界条件,得到了面内应变和弯曲应变的级数解,进而求得剪力滞后系数。通过算例分析和与有限元分析结果的对比,证明了该方法的收敛性和精度。参数分析结果表明,剪力滞后现象主要存在于面内应变中,滞后程度主要取决于板的宽跨比和荷载类型等参数。

Shear lag analysis of simply supported composite steel-concrete beams

The shear lag phenomenon in concrete flanges of composite beams was modeled using the partial differential equations for thin plate theory. Series solutions were derived for the in-plane strain, deflection and bending strain that satisfy the simplified boundary conditions to calculate the shear lag coefficient. Comparison of the solution with a simply supported steel-concrete beam subjected to various types of loads, b/L ratios and other parameters with a finite element solution shows that the method is accurate and fast. The results of the parametric analysis demonstrate that only the in-plane strain significantly affects the shear lag. The b/L ratios and the loading types have the most significant influence on the shear lag in concrete slabs.