宁波三官堂大桥桁架制造线形确定方法研究

Study on Method of Determining Construction Alignment of Truss for Ningbo Sanguantang Bridge

对连续钢桁架桥分别采用两种施工方法的结构成桥受力状态进行了理论推导,并对其桁架制造线形的确定方法进行了研究。分析表明,分别采用中跨设置临时墩和边支点顶升两种施工方法的连续钢桁架桥可达到相同的成桥受力状态,除合龙段外的桁架制造线形一致,而合龙段的制造线形应根据不同的施工方法进行调整。

The article theoretically analyzes the completed stress states of continuous steel truss bridge constructed by two different methods,and studies the determining method of its truss construction alignment.The analysis shows that two construction methods of setting temporary piers in the middle span and lifting side supports for the continuous steel truss bridge can achieve the same stress states of finished bridge.The construction alignment of the closure section should be adjusted according to the different construction methods except the construction alignments of truss being coincident with each other outside of closure section.