复杂环境下大跨斜交钢箱梁设计分析

Design and Analysis of Long-span Skew Steel Box Girder under Complex Conditions

摘要:

为解决复杂环境下大跨径斜交桥梁的设计难题，针对斜交钢箱梁在复杂条件下的适用性进行了设计分析。借由某具代表性大跨径斜交钢箱梁桥的工程背景，阐明了在大跨径、大斜交角、软弱地基及复杂空间交通等多重复杂条件下，桥梁设计中出现的严峻挑战，基于以上情况，系统对比了钢箱梁和其他下部结构形式的适用性，采用有限元数值模拟方法，对钢箱梁及下部结构进行了静力分析，获得各构件的内力响应，最后通过优化钢箱梁的结构布置、支座设计和桥台结构型式，实现了该斜交桥梁设计方案的全面优化，大幅提升了此结构在复杂环境下的安全性、经济性和美观性，为同类复杂工程环境下的大跨径斜交桥梁设计提供了可靠的解决方案。

Abstract:

To solve the design problems of long-span skew bridges under complex conditions, the applicability of skew steel box girders under complex conditions are designed and analyzed. Taking a representative long-span skew steel box girder bridge as the engineering background, the severe challenges in the bridge design under the complex conditions of large span, high skew angle, weak subgrade and complicated spatial traffic are set forth. Based on the above, the applicability of steel box girders and other substructure forms are systematically compared. The finite element numerical simulation is utilized to conduct the static analysis on the steel box girder and substructures in order to obtain the internal force response of each component. Finally, through the optimization of the structural layout of steel box girder, support design and abutment structural form, the design scheme of the skew bridge is fully optimized to greatly improve the safety, economy and aesthetics of the bridge under complex conditions, which provides a reliable solution for the design of long-span skew bridges under similarly complex engineering environments.