【摘要】 建立了考虑钢梁与混凝土板之间的滑移效应以及截面的塑性发展对钢-混凝土组合梁截面刚度影响的组合梁刚度计算模型,进行了理论推导.应用偏心板单元和偏心连接单元编制了钢-混凝土组合梁非线性有限元分析程序NACB2.0,利用NACB2.0及ANSYS进行了组合梁非线性分析,计算了组合梁在各级荷载下的挠度值,确定了组合梁的弹性截面刚度和塑性截面刚度,得出了截面刚度计算公式,并与规范中的换算截面法和现有的试验结果进行了对比.结果表明:滑移效应及塑性发展在一定程度上使组合梁的截面刚度比按照换算截面得到的刚度低,不可忽略;理论分析和推导与试验结果吻合很好.更多还原

【Abstract】 The model of composite beams′ rigidity considering the slip effect between steel beams and concrete slabs and plastic development of cross-sections to the effect of rigidity is built in this paper.Theoretical deduction is carried out.Nonlinear finite element analysis program of steel-concrete composite beams(NACB20) is worked out using eccentric plate elements and eccentric joint elements.The author carried out nonlinear analysis of composite beams by using the program NACB20 and ANSYS.By calculating deflection under different loads,elastic cross-section rigidity and plastic cross-section rigidity are obtained.After that we obtained the calculated formula of cross-sections′ rigidity.Comparing the transformed cross-sections method in the norms and the experimental results,the result shows that slip effect and plastic development make the rigidity of composite beams lower than transformed cross-sections method.The proposed calculated result has good agreement with that of the experimental results.更多还原