在役简支T梁结构连续化改造中的支座选型研究

Research on Bearing Selection for Continuous Transformation of Simply Supported T Beam Structure under Service

为研究不同型式支座对桥梁结构受力性能的影响,文中以某40 m预应力混凝土简支T梁桥连续化改造加固为例,通过对2种不同型式支座下桥梁结构进行受力分析及对比,对双支座桥梁结构连续的支座选型展开研究。结果表明,相对于刚性支座,橡胶支座可以明显地减小墩顶负弯矩。在此基础上,对2种不同型号的弹性橡胶支座支反力进行承载能力极限验算,计算结果表明,GJZ 400×400×99型板式橡胶支座满足该类桥梁要求,相对合理。

In order to study the influence of layout of single and double bearings on the mechanical performance of bridge structures,taking a 40m prestressed concrete simply supported T beam bridge as an example,the continuous transformation and reinforcement is analyzed.Through the analysis of the stress on the bridge structure under two different types of supports,the comparison and selection of the two types of structures are carried out,and the selection of the continuous supports of the double-support bridge structure is analyzed.The results show that,compared with the rigid support,the rubber support can reduce the negative bending moment of the pier obviously.On this basis,the bearing capacity limit of two different types of elastic rubber bearings is checked,and the calculation results show that GJZ 400×400×99 plate rubber bearings meet the requirements of this type of bridge.