钢-混凝土组合梁设计改进及其在超高层结构中的应用研究

Research on design improvement of steel-concrete composite beam and its application in super high-rise structure

探讨了组合框架梁刚度放大系数计算方法,分析了组合框架梁刚度放大系数对整体结构的影响。通过减小上翼缘尺寸改进了组合次梁截面,并对组合次梁挠度及承载力的变化进行研究。给出了组合框架梁与组合次梁统筹深化设计流程。改进组合框架梁截面形式可以简化刚度放大系数的计算方法,并且使刚度放大系数得到提高。组合框架梁的刚度放大系数与层间位移角和框架部分分配的地震剪力呈正相关。改进组合次梁的挠度有所增大,承载力基本没有变化。通过对组合框架梁和组合次梁进行统筹设计,可以有效利用结构高度,保证建筑净高。

The calculation method of rigidity amplification coefficient for composite frame beam was discussed,and the influence of rigidity amplification coefficient on the whole structure was analyzed. The section of composite secondary beam was improved by reducing the size of upper flange and the variation of deflection and bearing capacity was studied. The process of detailed design on both composite frame beam and composite secondary beam was given. The calculation method of rigidity amplification coefficient can be simplified and the rigidity amplification coefficient can be increased by the o,improvement of section form for composite frame beam. The rigidity amplification coefficient of composite frame beam is correlated with inter-story displacement angle and seismic shear force distributed by framework. The deflection increases after the improvement of composite secondary beam,but there is no change basically on bearing capacity. The structural height can be used effectively and the clear height can be ensured by optimized design on both composite frame beam and composite secondary beam.