下承式钢管混凝土拱梁组合拱桥拱脚有限元应力分析

通过对某下承式钢管混凝土拱梁组合拱桥拱脚进行空间有限元分析，通过拱脚节点的整体、局部和与系梁交接的截面应力云图，分析得出拱脚节点除在截面变化的局部区域有较大拉应力，其余以受压为主，内部应力分布均匀，结构构造设计合理；通过应力迹线分析，得出系梁刚度的加大更适合拱脚节点的受力；为了避免局部破坏，建议在设计中应注意拉力过大区域的抗裂设计，如加设钢筋网或铺设钢板等。

FEM stress analysis of springing joint for CFST and arch-beam composite through arch bridge

The spatial finite element analysis of springing joint for a CFST and arch-eam composite arch bridge was carried out in this paper through the arch foot nodes of global,local stress nephogram, the handover, collar beam section. The results showed that the main inner force in springing was compressive stress which distributing uniform and the structure design of this bridge was reasonable. However, the tensile stress were large in the local place where the section changes abruptly. Through stress analysis of trace beam rigidity increase more suitable for the stress of the arch foot nodes so the anti-crack design should be strengthened in these areas, such as adding mesh, reinforce- ment or laying steel plate, etc.