混合梁斜拉桥钢—混结合段力学性能研究
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摘要
为了解混合梁斜拉桥钢—混结合段受力及传力规律,指导钢—混结合段的设计,以某主跨580m的混合梁斜拉桥为背景,采用有限元软件建立钢—混结合段整体模型,并对比缩尺模型试验结果,建立局部剪力钉推出模型,分析剪力钉传力规律。结果表明:钢—混结合段截面混凝土竖向应力分布不均匀,大小呈凹曲线分布;纵向应力由结合段截面向混凝土段递减。竖向上各剪力钉剪力呈马鞍形分布,上、下剪力钉剪力高于中间剪力钉;横向上内侧剪力钉剪力大于外侧剪力钉;荷载越大,剪力钉竖向受力越均匀,剪力钉刚度越大,各剪力钉的受力越不均匀。
To examine the load bearing and transferring behaviors of the steel-concrete joint section in the hybrid girder cable-stayed bridge and to guide the design of steel-concrete joint section,a hybrid girder cable-stayed bridge with a main span of 580 m was taken as the study background.The scale-down model test for the steel-concrete joint section was carried out.The finite element software was used to establish the overall calculation model as well as the overall and local models used for the shear studs push-out tests of the steel-concrete joint section,to study the stress distribution law of the integral structure of the joint section and the load transferring behavior of the shear studs.The results demonstrate that the vertical stress distribution in the cross-section concrete of the steel-concrete joint section is not uniform,tracing the line of concave curve distribution.The longitudinal stress gradually decreases from the cross-section of the joint section to the concrete section.The shear forces of each shear stud in the vertical direction follow the way of saddle-shaped distribution.The shear forces in the upper and lower shear studs are bigger than those in the central shear studs.In the horizontal direction,the shear forces in the inner shear studs are bigger than those in the outer shear studs.The bigger the loads,the more uniform the vertical loads in the shear studs will be distributed.Whereas the bigger the rigidity of the shear studs,the less uniform the loads in the shear studs will be distributed.
To examine the load bearing and transferring behaviors of the steel-concrete joint section in the hybrid girder cable-stayed bridge and to guide the design of steel-concrete joint section,a hybrid girder cable-stayed bridge with a main span of 580 m was taken as the study background.The scale-down model test for the steel-concrete joint section was carried out.The finite element software was used to establish the overall calculation model as well as the overall and local models used for the shear studs push-out tests of the steel-concrete joint section,to study the stress distribution law of the integral structure of the joint section and the load transferring behavior of the shear studs.The results demonstrate that the vertical stress distribution in the cross-section concrete of the steel-concrete joint section is not uniform,tracing the line of concave curve distribution.The longitudinal stress gradually decreases from the cross-section of the joint section to the concrete section.The shear forces of each shear stud in the vertical direction follow the way of saddle-shaped distribution.The shear forces in the upper and lower shear studs are bigger than those in the central shear studs.In the horizontal direction,the shear forces in the inner shear studs are bigger than those in the outer shear studs.The bigger the loads,the more uniform the vertical loads in the shear studs will be distributed.Whereas the bigger the rigidity of the shear studs,the less uniform the loads in the shear studs will be distributed.
引文
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[7]邓万栋.钢混组合梁桥病害成因及其加固措施探讨[J].人民交通,2019(3):88,90.
[8]吴庆雄,刘钰薇,江越胜,等.墩梁半刚性连接的钢-混组合梁整体桥设计[J].桥梁建设,2019,49(1):101-106.
[2]陈开利,余天庆.混合梁斜拉桥结合段设计技术的新发展[J].铁道标准设计,2006(5):43-44.
[3]米肖松.浅谈混合梁在我国桥梁中的应用与设计要点[J].工程建设与设计,2018(19):115-117.
[4]张峰.斜拉桥钢-混结合段应力特征分析[J].工程建设与设计,2018(11):165-166,169.
[5]谢国红.铁路独塔混合梁斜拉桥钢-混结合段应力分析[J].交通科技,2018(3):61-64.
[6]张奇志,李向军,朱洪凯.斜拉桥索塔锚固区剪力钉受力机理试验研究[J].世界桥梁,2011(3):49-52,68.
[7]邓万栋.钢混组合梁桥病害成因及其加固措施探讨[J].人民交通,2019(3):88,90.
[8]吴庆雄,刘钰薇,江越胜,等.墩梁半刚性连接的钢-混组合梁整体桥设计[J].桥梁建设,2019,49(1):101-106.