宽弯现浇箱梁折面梁格模型与单梁模型应力对比分析

叶超

国家林业和草原局昆明勘察设计院，云南 昆明  650216

摘要：为提高桥梁施工质量，实现精细化设计理念，采用MIDAS/Civil软件进行空间三维建模，并进行抗倾覆、抗裂验算，对比分析宽弯现浇箱梁的折面梁格模型与单梁模型在不同荷载组合作用下的应力。结果表明：折面梁格模型可准确反映箱梁的整体稳定性及各腹板的受力情况，在持久状况正常使用极限状态、持久状况和短暂状况下，构件的应力分析存在一定的局限性，需结合单梁模型进行整桥的安全验算。

关键词：宽弯现浇箱梁；折面梁格模型；单梁模型；抗倾覆；抗裂模型；精细化设计

Stress comparison and analysis between the folded grid model of cast-in-situ box girder and the single beam model

YE Chao

Kunming Institute of Survey and Design, State Forestry and Grassland Administration, Kunming 650216, China

Abstract:To improve the quality of bridge construction and realize the precise design concept, MIDAS/Civil is used to build 3D spatial model and do anti-overturning and anti-crack checking calculation. The stress of the folded grid model of cast-in-situ curved wide box girder is compared with the single beam model under different load combinations. The results show that the folded grid model of cast-in-situ curved wide box girder can reflect the overall stability of box girder and stress of web accurately. But there are still some limitations in the stress analysis of the members in the limit state, the permanent state and the transient state. It’s necessary to conduct the safety checking calculation of the whole bridge by combing the single beam model.

Keywords:cast-in-situ curved wide box girder; fold-surface beam-grid model; single girder model; anti-overturning; anti-crack model; refined design