无格室钢-混结合段构造形式与受力性能分析

Analysis of Structural Types and Mechanical Performance in Steel-concrete Connections without Cell

为研究无格室钢-混结合段不同构造形式的受力性能,本文以梨川大桥无格室钢-混结合段为研究背景,通过数值分析方法分别就两种不同连接件构造形式的钢混结合段受力性能进行了分析。计算分析结果表明:钢-混结合段PBL和栓钉连接件顺桥向应力分布不均布,靠近承压板位置受力较大;负弯矩区结合段混凝土部分顶板横向应力分布不均匀,预应力筋的设置对其结合部位混凝土顶板应力横桥向分布有影响;钢梁顶底板的刚度过渡加劲肋和等高U肋的突变部分,具有较大局部应力集中;栓钉连接件和PBL与栓钉组合的连接件形式对结合段部位混凝土和钢顶板受力影响不大。

In order to research the mechanical performance of different types of steel-concrete connection without cell,based on the steel-concrete connections without cell in Lichuan bridge, we analyzed the mechanical performance of 2 types of such connection through numerical analysis method. The analysis result shows that（ 1） the PBLs and the studs in the steel-concrete connections have non-uniform mechanical behaviors in the bridge direction,the PBLs and the studs near the bearing plate have a larger inner force;（ 2） the transverse stress distribution of top flange in the steel-concrete connections under hogging moment is nonuniform distributed,while the arrangement of prestressed tendons has an impact on the distribution of stress of top flange of the connections in transverse direction;（ 3） the mutation parts of stiffening ribs and constant U-ribs on top and bottom flanges of steel beam possess greater partial stress concentration;（ 4） there is little influence of the connection types of the PBLs and the studs on the stress of concrete and steel flange of the connection.