一种解决弯桥内外侧支座反力不均的方法

A Method to Solve Uneven Reaction of Inside and Outside Bearings of Curved Bridge

摘要:

很多城市立交桥的匝道桥处于曲线半径较小的路段上，由于外荷载对曲线内外侧的作用不同——反力是不均匀的，位于曲线半径上的梁桥需要解决施工和运营过程中的反力不均问题。以某市某立交S1匝道桥为背景，对该桥设计计算中包括强迫位移调整反力的方法及效果进行阐述。通过对是否施加强迫位移及施加不同数值强迫位移的比较，对曲线段墩顶反力进行分析得出其规律，从而选择合理的强迫位移值并确定施工过程中的施加方法及采取相应措施。经施工现场测试，S100#~S102#匝道桥内外侧反力趋势符合规律，受力有所改善。

Abstract:

Ramp bridges for many urban overpasses are located on road section with smaller curve radius. Due to the different actions of outer load on the inner and outer sides of curve - uneven reaction, it is required to solve the problems of uneven reaction in the construction operation of bridge on the curve radius. Based on the background of S1 Ramp Bridge for an urban overpass, the methods and effects in the design and calculation of this bridge including the forced displacement and reaction adjustment are expounded. Through the comparison of whether or not to apply the forced displacement and applying the different numerical forced displacements, the reaction at the pier top in the curve section is analyzed to obtain its law so as to select the reasonable forced displacement value and determine the applying method and the relevant measures taken in the construction process. After the test of construction field, the trend of inside and outside reactions of S100#~S102# Ramp Bridges is in accordance with the law. The stress is improved.