钢箱梁与倾斜钢墩连接节点受力性能分析

Analysis on Mechanical Performance of Connection Node between Steel Box Girder and Inclined Steel Pier

文章以某人行景观天桥为工程背景,通过有限元分析,获得了钢箱梁与倾斜钢墩连接节点的应力分布状态。研究结果表明,对于倾斜钢墩与钢箱梁的连接,锐角侧应力集中现象明显强于钝角侧,实际工程中应注意锐角侧受力情况。在应力集中部位,墩梁连接点处先进入塑性,同时von Mises应力值随加载历程呈现出先直线上升,后趋于平缓的上升趋势;在连接节点处,钢墩的加劲肋端部会出现应力集中现象,若在该部位对应的钢箱梁底板处设置加劲肋或补强钢板,可大幅减小应力值。因此,在钢结构桥梁的设计中,应在钢墩与钢箱梁底板连接处设置加劲肋,以提高桥梁的稳定性。

Taking a pedestrian landscape overpass as the engineering background,the stress distribution state of the connection node between the steel box girder and the inclined steel pier is obtained through the finite element analysis.The research results show that,for the connection between the inclined steel pier and the steel box girder,the stress concentration phenomenon on the acute angle side is significantly stronger than that on the obtuse angle side,and the stress on the acute angle side should be paid attention to in the actual project.At the stress concentration part,the pier girder connection point first enters plasticity,and meanwhile the von Mises stress value shows a straight upward trend with the loading process.At the connection node,the stress concentration phenomenon will appear at the end of the stiffener of the steel pier,and if the stiffening rib or the reinforcing steel plate is arranged at the steel box girder bottom plate corresponding to this part,the stress value can be greatly reduced.Therefore,in the design of steel structure bridge,stiffening rib should be arranged at the connection part of steel pier and steel box girder bottom plate to improve the stability of the bridge.