支撑方式对独柱异形箱梁桥受力性能研究

Research On Stress Analysis For The Effect Of Supporting Way On Irregular Box Girder With Single Column

由于独柱异形桥有其独特的构造形式,主桥与匝桥通常形成分叉结构,因此形成了独柱大悬臂异形桥,当独柱异形桥悬臂过大时,可能造成悬臂应力过大及墩柱偏心造成受力不均匀现象。为了验证和讨论支撑方式对独柱异形桥的影响,本文通过改变独柱处的支撑方式,采用梁格理论建立有限元模型,分析支撑方式对异形桥的纵向弯矩、扭矩、支反力及隐形盖梁的内力的影响。研究结果表明,双柱支撑可以使跨中效应降低,支点负效应增加;扭矩变化比独柱支撑的扭矩变化均匀。

Since the independence column shaped bridge has its unique structural form that the main bridge and the bridge turn usually form urcated structure, thus it creats a single large column shaped cantilever bridge. Whereas, the single column shaped cantilever bridge is too large, too much stress can cause the cantilever and Pier eccentric discontinuity phenomenon. In order to verify and discuss the impact of the support pillar shaped bridge way alone, the paper by changing the single support column at the way the finite element model using beam lattice theory, the way to support the bridge shaped longitudinal bending moment, torque reaction forces and invisible beams cover the impact of internal forces. The results show that double - column support allows the effect of reducing the cross, in- crease the negative effects of the fulcrum; torque torque variation ratio change alone column supoortin~ uniform.