高震区有轨电车小半径曲线连续刚架桥抗震性能研究

Research on Seismic Performance of Small Radius Curved Continuous Rigid Frame Bridges for Modern Trams in High Earthquake Area

连续刚架桥墩梁固结具有整体性好、抗扭刚度大、桥梁建筑结构高度低等特点,在现代有轨电车小半径曲线桥建设中具有一定应用价值。目前该结构在高震区应用较少,为研究其抗震性能,结合工程实例,基于Pushover方法考虑高阶振型影响,通过Midas Civil有限元软件对小半径曲线连续刚架桥进行多方向推覆分析得出能力曲线,再通过能力谱法得出结构在设防地震作用下的性能点,从结构塑性变形能力、塑性铰开展、结构内力分布等方面研究结构的抗震性能。结果表明,小半径曲线连续刚架桥具有较大的水平承载能力和位移变形能力,具有良好的抗震性能,满足抗震设防要求,可为此结构在高震区现代有轨电车小半径曲线桥中的应用提供参考价值。

The continuous rigid frame bridges with the pier and beam consolidation has the characteristics of good integrity,high torsional stiffness,and low structural height of bridges,which has certain application value in the construction of small radius curve bridges for modern trams.At present,this structures are rarely used in high earthquake regions.In order to study the seismic performance of the structure,combined with the example of the project,based on the Pushover method and considering the influence of higher-order vibration modes,the capacity curve of the small radius curve continuous rigid frame bridges is obtained through multi-directional pushover analysis using Midas Civil finite element software.Then the performance points of the structure under seismic fortification are obtained through the capacity spectrum method,and the seismic performance of the structure is studied from the aspects of plastic deformation capacity,plastic hinge development,and internal force distribution of the structure.The research results indicate that the small radius curved continuous rigid frame bridges have significant horizontal bearing capacity and displacement deformation capacity,and has good seismic performance,meeting seismic fortification requirements.It can provide reference value for the application of modern tram small radius curved bridge engineering in high seismic areas.