混凝土凹角楼板有限元分析和设计方法研究

Finite element analysis and design method for concrete slab with corner cutout

对混凝土凹角楼板进行了分析,考虑周边楼层梁对楼板的不同嵌固刚度,研究了不同边界条件下楼板变形和内力的分布规律,同时研究了凹角楼板的应力集中现象。非线性分析结果表明由于薄膜效应的影响,楼板的挠度和应力均比线性分析结果略小,因而设计中采用线性分析偏于安全。给出一个工程实例,并得出一些有价值的结论。

Analyses are carried out for concrete slab with corner cutout. The deformation and the internal force in the sections are investigated for different boundary conditions with consideration of the built-in stiffness of the peripheric beams. and meanwhile the phenomenon of stress concentration is studied meanwhile. The nonlinear results show that the deflection and stress of slab decreases slightly in comparison with the linear results, as the nonlinear algorithm takes the membrane effect into account. Linear analyses are therefore recommended in slab design for safety. An example in a practical engineering is given, and some valuable conclusions are drawn.