曲线匝道桥抗倾覆设计和已建桥梁加固措施研究

Study on Anti-overturning Design of Curved Ramp Bridge and Reinforcement Measures of Built Bridge

近年来城市立交的兴建产生了大量小半径曲线匝道桥。由于曲线桥主梁的扭转从而导致梁端支座受力不均,避免边支座脱空和确保梁桥抗倾覆能力成为桥梁设计日益突出的重点。从下部支承设置和桥梁防支座脱空的关系出发,以某匝道桥设计实例为依据,通过空间有限元分析,提出匝道桥设计中推荐的支承设置方式。通过设计案例并结合近年频发的安全事故,对已建匝道桥提高抗倾覆能力易行有效的加固措施进行归纳总结。

In recent years, the construction of urban interchanges has produced a large number of minor radius curved ramp bridges. The torsion of the main beam of curved bridge will lead to the uneven stress of the bearing at the end of beam. To avoid the edge bearing separation and to ensure the anti-overturning capacity of bridge will become the increasingly prominent focus of bridge design. From the relationship between the lower bearing setup and the bridge bearing separation prevention, and taking a design case of ramp bridge as the basis, the article puts forward the bearing setup mode recommended in the design of ramp bridge by the spatial finite element analysis. According to the design cases combined with the safety accidents frequently in recent years, the article summarizes the feasible and effective reinforcement measures to improve the anti-overturning capacity of built ramp bridges.