预应力荷载对曲线梁桥的力学行为分析

Analysis on Mechanical Behavior of Curved Beam Bridges under Prestressing Loads

摘要:

为明确曲线梁桥预应力荷载效应变化规律，以某曲线等截面预应力混凝土梁桥为研究对象，研究梁桥曲线半径在90、120、200、350、500 m条件下，预应力荷载作用下梁桥的力学性能。研究结果表明：（1）曲线梁桥在预应力荷载作用下，梁体呈现向外侧“崩出”趋势；（2）随着曲线半径不断减小，横桥向剪力及弯矩不断增大，扭矩不断减小，但对竖向剪力及弯矩影响较小；（3）不同曲线半径下，内外侧支座在预应力荷载作用下呈现明显的不均匀现象，且随着曲线半径不断增大，内外侧反力差值在不断缩小。研究结论可为曲线预应力混凝土梁桥的设计与施工提供理论参考。

Abstract:

To clarify the variation pattern of prestressed load effects on curved bridges, taking a curved equal-section prestressed concrete beam bridge as the research object, the mechanical properties of bridges under prestressed loads with curve radii of 90、120、200、350、500 m are studied. The research results indicate that: (1) under prestressed loads, the beam body of the curved beam bridge exhibits a tendency to “bulge out” towards the outside. (2) As the curve radius continuously decreases, the transverse shear force and bending moment continuously increase, while the torsional moment continuously decreases, with minimal impact on the vertical shear force and bending moment. (3) Under prestressed loads, the inner and outer supports exhibit significant unevenness at different curve radii, and as the curve radius continuously increases, the difference in reaction forces between the inner and outer sides continuously shrinks. The research conclusions can provide theoretical references for the design and construction of curved prestressed concrete bridges.