摘要
索梁锚固结承受斜拉索巨大拉力,再将索力匀顺地传递至钢主梁,该结构的可靠性将影响到整个桥梁结构的安全。以长沙铜靖湘江大桥为工程背景,基于空间索面斜拉索及主桁相对位置关系,结合索桁锚固结构受力特性,研发适用于斜拉索任意空间角度变化的索桁锚固结构。建立空间板壳元模型,研究空间索面钢桁梁斜拉桥索桁锚固结构的受力特性。研究结果表明:该索桁锚固结构具有良好的空间角度变化适应性、良好的整体受力性能和抗疲劳性能;内外侧锚拉板受力协调合理,焊缝开裂风险极小;钢锚箱受力明确,应力扩散途径通畅。新型索桁锚固结构可为类似工程提供参考。
Cable-girder anchorage structures bear huge tension from stay cables,and transmit the forces to steel girders well-distributed.So,the anchorage structures’reliability plays a significate role in the whole bridge safety.Based on the relative location relationship between spatial cables and truss,the Changsha Tongjing Xiangjiang River Bridge was cited as an example in this paper.Taking the mechanic behaviors of cable-truss anchorage structures in consideration,the cable-truss anchorage structure was developed,which was adapted to spatial cable planes.The mechanic behaviors of cable-truss anchorage structure in steel truss girder cable-stayed bridge with spatial cable planes were studied by building shell element models.The results show that the developed cable-truss anchorage structure possess good adaptability to spatial angles of cables.Meanwhile,the cable-truss anchorage structure is provided with good overall mechanical properties and fatigue resistance.The tensile plates are stressed harmoniously,and the weld line’s cracking risk is minimal.The steel anchor boxes are stressed definitely,and the stresses’transmission routes are clear.The new type of cable-truss anchorage provides a conference for similar engineering.
作者
刘勇
程丽娟
卢立志
崔剑峰
LIU Yong;CHENG Lijuan;LU Lizhi;CUI Jianfeng(Hunan Provincial Communication Planning,Survey&Design Institute Co.,Ltd,Changsha 410219,China;School of Civil Engineering,Central South University,Changsha 410075,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2019年第11期2759-2765,共7页
Journal of Railway Science and Engineering
基金
交通运输部建设科技项目(2013318798320)
HNCDI科技计划项目(2018118)
关键词
空间索面
索桁锚固
钢桁梁斜拉桥
疲劳荷载
板壳元模型
spatial cable planes
cable-truss anchorage
steel truss girder cable-stayed bridge
fatigue loads
shell element model
