独柱曲线梁桥的抗倾覆设计与研究

Overturning Design and Study of Single Column Curved Girder Bridge

城市立交的飞速发展,使独柱曲线梁桥形式得到广泛应用。由于设计的不足和车辆的超载问题,近年来桥梁倾覆事件频有发生。从事故原因入手,针对我国近年来发生的桥梁倾覆事故及病害,总结其规律和特点后,得出两种类型的破坏形式和导致倾覆破坏的关键因素,并指出抗倾覆设计思路的两个步骤。针对活载影响下的抗倾覆设计提出抗倾覆安全系数的定义,通过对北京市现有独柱支承梁桥影响参数的统计,建立典型模型进行计算分析,得出不同临界状态下安全系数的取值。而针对内外力组合影响下的抗倾覆设计则是采用工程实例分析的方法进行阐述,经空间有限元计算分析、试验验证计算结论等一系列做法,为独柱曲线梁桥设计提供了重要案例参考。

The rapid development of city overpass makes the form of single column curved girder bridges have been widely applied.Owing to the problems of deficient design and vehicle overload,the bridge overturning events occur frequently in recent years.From the accident causes,and aiming at the bridge overturning accidents and failings caused in recent years in China,the article summarizes the regularity and characteristics,gives two kinds of the failure form and the key factors of causing the overturning failure,and points out two steps of overturning design ideas.The definition of overturning safety coefficient is proposed for the overturning design under the influence of live load.According to the statistical parameters of the impact on the existing single column supported girder bridges in Beijing City,a typical model is established for calculation and analysis to educe the safety coefficients under the different critical conditions.The article sets forth the overturning design under the influence of internal and external forces by the analysis method of engineering cases.A series of the spatial finite element calculation analysis,experiment,verification and calculation provides an important reference for the design of single column curved girder bridge.