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在连续钢-混凝土组合梁的设计中,在下垂段可利用横截面的塑性抵抗,该区段内钢梁的受压法兰与钢筋混凝土板相连。然而,在弯曲段正常采用横截面的弹性验证,该区段内钢梁的受压部分不受混凝土板的约束,更易于屈曲。在下垂段采用利用塑性抵抗而在弯曲段采用弹性抵抗的综合设计方法,能满足弯曲段弯矩低于弹性极限时,下垂段的塑性弯矩仍能上升的要求。研究的目标是:提出钢-混组合桥梁简化的概率非线性分析的框架及通过此框架获得实际的三跨连续钢-混组合公路桥梁的弹塑性设计。基于一次二阶矩近似,采用所提方法计算结构响应量的一阶和二阶统计矩(方差、协方差)。说明和讨论了基准问题的确定及概率数值结果。
In the design of continuous steel-concrete composite beams, the plastic resistance of the cross-section can be used in the sagging section, and the compression flange of the steel beam in this section is connected to the reinforced concrete plate. However, cross-sectionally elastic verification is normally used at the bend, where the compressive part of the steel beam is not constrained by the concrete slab and is more prone to buckling. In sagging section, the comprehensive design method using plastic resistance and elastic resistance in bending section can meet the requirement that the plastic bending moment in sagging section can still rise when the bending moment is lower than the elastic limit. The objectives of the study are: to propose a simplified probabilistic nonlinear analysis framework for steel-concrete hybrid bridges and to obtain an elasto-plastic design of the actual three-span continuous steel-concrete composite highway bridges through this framework. Based on the first-order second-order approximation, the first-order and second-order statistical moments (variance and covariance) of the structural response are calculated by the proposed method. Describes and discusses the benchmarking problem and the probabilistic numerical results.