某钢管混凝土拱梁组合桥系梁受力性能分析
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摘要
由于不同的原因,钢管混凝土拱梁组合桥系梁易发生横向裂缝。本文以一座下承式钢管混凝土拱梁组合桥为研究对象,采用有限元软件对施工阶段和成桥运营阶段系梁的受力进行分析,讨论系梁表面横桥向裂缝发生的原因。研究表明:施工阶段,系梁的最大压应力为-11.3MPa,最大拉应力为1.801MPa,满足要求;承载能力极限状态,最不利荷载组合作用下系梁截面承载能力满足要求;正常使用极限状态,不考虑温度梯度荷载效应,虽然拱脚位置系梁压应力为10.7MPa满足要求,却出现了不允许出现的最大为0.643MPa的拉应力;当考虑温度梯度荷载效应后,系梁大部分截面出现拉应力,最大达3.91MPa,系梁应力超标。通过增大系梁结构尺寸、改善预应力束配置的方式优化系梁设计,优化后系梁应力满足要求。
Transverse cracks are easy to occur in tie beams due to different reasons. In this paper, mechanical behavior analysis of tie beam on concrete-filled steel tubular arch-girder combination bridge by finite element software was carried out, and the causes of transverse cracks on tie-beam were discussed. The research shows that the maximum compressive stress and tensile stress of the tie-beam are-11.3 MPa and 1.801 MPa at the construction stage, respectively, which meet the requirements. In the ultimate state of bearing capacity, the bearing capacity of the tie-beam under the most unfavorable load meets the requirements. In the serviceability limit state, the maximum compressive stress and tensile stress of the tie-beam are 0.643 MPa and-10.7 MPa with the regardless of the effect of temperature gradient load, which meet the requirements. However, the stress of the tie-beam exceeds the limit during considering the effect of temperature gradient load. By increasing the structural size of the girder and improving the prestressed tendons configuration, the stress of the girder can be optimized and the stress of the girder can meet the requirements.
Transverse cracks are easy to occur in tie beams due to different reasons. In this paper, mechanical behavior analysis of tie beam on concrete-filled steel tubular arch-girder combination bridge by finite element software was carried out, and the causes of transverse cracks on tie-beam were discussed. The research shows that the maximum compressive stress and tensile stress of the tie-beam are-11.3 MPa and 1.801 MPa at the construction stage, respectively, which meet the requirements. In the ultimate state of bearing capacity, the bearing capacity of the tie-beam under the most unfavorable load meets the requirements. In the serviceability limit state, the maximum compressive stress and tensile stress of the tie-beam are 0.643 MPa and-10.7 MPa with the regardless of the effect of temperature gradient load, which meet the requirements. However, the stress of the tie-beam exceeds the limit during considering the effect of temperature gradient load. By increasing the structural size of the girder and improving the prestressed tendons configuration, the stress of the girder can be optimized and the stress of the girder can meet the requirements.
引文
[1]陈宝春.钢管混凝土拱桥(第三版).北京:人民交通出版社股份有限公司,2016.
[2]王成波.基于统一理论的钢管混凝土系杆拱桥施工控制[A]//第27届全国结构工程学术会议论文集(第Ⅱ册)[C].西安,2018.6.
[3]黄育凡,吴庆雄,陈康明.钢管混凝土拱梁组合桥整体架设施工受力性能分析[J].桥梁建设,2018,48(01):25-30.
[4]王哲龙.钢管混凝土系杆拱桥系梁应力状态分析[J].铁道建筑,2016(11):23-25,30.
[5]王坤,张洪俊.下承式钢管混凝土拱桥系杆扭矩分析[J].交通世界(建养.机械),2011(06):169-171.
[2]王成波.基于统一理论的钢管混凝土系杆拱桥施工控制[A]//第27届全国结构工程学术会议论文集(第Ⅱ册)[C].西安,2018.6.
[3]黄育凡,吴庆雄,陈康明.钢管混凝土拱梁组合桥整体架设施工受力性能分析[J].桥梁建设,2018,48(01):25-30.
[4]王哲龙.钢管混凝土系杆拱桥系梁应力状态分析[J].铁道建筑,2016(11):23-25,30.
[5]王坤,张洪俊.下承式钢管混凝土拱桥系杆扭矩分析[J].交通世界(建养.机械),2011(06):169-171.