不同支承形式对曲线混凝土梁桥性能影响分析

Analysis on Influence of Different Support Patterns on Performance of Curved Concrete Beam Bridge

摘要:

为探明混凝土曲线梁桥在弯扭耦合作用下的受力特征，以某枢纽曲线预应力混凝土梁桥为工程背景，采用不同支承形式和预偏心作用下桥梁的支反力及扭矩性能，通过参数类比的方法进行了研究。结果表明：采用双支座能够有效降低曲线桥梁的扭转跨径，从而减小曲线梁桥的扭矩效应，且抗扭支座设置得越多，对减小曲线梁桥扭矩效应越为明显；曲线梁桥可以通过设置合理的预偏心值来降低梁端扭矩，平衡支座反力，尤其是在中墩采用单支点传力情况下；预偏心设置有效改变了支点位置处的集中扭矩作用，使得扭矩分布沿着支点位置存在突变，从而达到扭矩值趋于平衡的作用，使抗扭支点控制截面扭矩峰值减小。

Abstract:

To verify the stress characteristics of concrete curved beam bridges under the bending torsion coupling, taking a prestressed concrete curved beam bridge in a hub as the engineering background, the support reaction and torque performance of the bridge under different support forms and pre-eccentricity action are studied through parameter analogy. The results show that the use of double supports can effectively reduce the torsional span of curved bridges, thereby reducing the torque effect of curved beam bridges. The more anti-torsion supports are set, the more obvious the reduction of torque effect of curved beam bridges. The curved beam bridges can reduce the beam end torque and balance the support reaction force by setting a reasonable pre-eccentricity value, especially when the central pier adopts a single support point for force transmission. The pre-eccentricity setting effectively changes the concentrated torque effect at the fulcrum position, causing a sudden change in torque distribution along the fulcrum position, thereby achieving a balanced torque value and reducing the peak torque of the anti-torsion fulcrum control section.