基于MIADAS CIVIL的多跨连续箱梁桥支架现浇施工关键技术研究

Research on Key Technology and Finite Element Analysis of Cast-In-Place Construction of Multi-Span Continuous Box Girder Bridge

现浇支架施工技术因其施工简便、成本低廉等显著优点在桥梁施工中应用较广,但需对地基承载力及支架受力进行详细分析,以确保施工状态下整体支架结构的稳定性及安全性。本文以银沪一上路跨京沪铁路立交为工程背景,对现浇连续箱梁施工技术应用过程中地基承载力、立杆稳定性等关键项目进行了理论计算,并运用有限元软件MIDAS CIVIL对横梁等关键构件进行了建模分析,综合现场支架预压关键截面实验数据、理论计算及有限元结果来看:该桥支架体系在施工状态下稳定性及安全性良好、满足施工要求,在对该桥合拢施工中起到一定的指导作用,也可为其他类似工程提供一定的借鉴。

Cast-in-place support construction technology is widely used in bridge construction because of its obvious advantages such as simple construction and low cost,but it is necessary to carry out a detailed analysis of the bearing capacity of the foundation and the force of the support to ensure the stability and safety of the overall support structure under construction.In this paper,based on Yinlu cross-Beijing Railway Interchange as the engineering background,the key items such as foundation bearing capacity and vertical rod stability during the application of cast-in-place continuous box girder construction technology are theoretically calculated,and the same section of the beam is modeled and analyzed by using the finite element software MIDAS CIVIL.Based on the experimental data,theoretical calculation and finite element results of key sections of the support precompression on site,it can be seen that the bridge support system has good stability and safety under construction,meets the construction requirements,plays a certain guiding role in the bridge closure construction,and can also provide a certain reference for other similar projects.