异形钢箱梁桥空间内力分析 Analysis of Spatial Internal Force of Deformed Steel Box Girder Bridge

为了顺应线路的走向，各种异形桥梁不断出现，异形钢箱梁因为其制作、安装、美观上的优势越来越受到青睐。现今对异形桥梁结构受力特性的简化分析方法，仍然存在着很多不足，所以对异形桥梁受力特性进行精确的分析非常必要。本文采用Midas/Civil中的板单元精确建立某异形钢箱梁的模型，结果表明：该桥的空间效应十分明显，在支座处存在明显的应力集中现象；该桥在标准组合下有支座存在失效的风险；该桥前两阶振型主要由弯曲控制，第三至第五阶振型由扭转控制。 In order to conform to the trend line, all kinds of deformed bridges appear constantly. Because of its superior production, installation and appearance, special-shaped steel box girder is more and more popular. At present, there are still many deficiencies in the simplified analysis method of the stress characteristics of the deformed bridge structures, so it is necessary to accurately analyze the stress characteristics of this bridge. This paper uses the plate unit of Midas/Civil to build a model of deformed steel box girder. The results show that the spatial effect of the bridge is obvious, and the bearing has evident stress concentration. The bridge has the risk of failure in the standard combination and the bridge has the bearing invalidation risk under the standard combination. The first and the second order vibration mode of the bridge are mainly controlled by bending. The third to the fifth order vibration mode are controlled by the reverse./span>