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西十高铁汉江特大桥主桥设计

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西十高铁汉江特大桥主桥为主跨420 m的梁桁组合结构双塔斜拉桥,采用半飘浮体系.主梁采用钢桁加劲PC箱梁,梁高3.0 m,桥面全宽17 m.PC箱梁采用C55混凝土,单箱四室等高截面,加劲桁采用渐变三角桁式,材质为Q370qE钢,桁高9.4 m.斜拉索采用标准抗拉强度1 770 MPa的镀锌平行钢丝,双索面扇形布置.桥塔采用花瓶式钢筋混凝土框架结构,塔高186.5 m,基础采用φ3m的钻孔灌注桩,按长短桩设计.结构受力分析结果表明:该桥力学性能指标均满足相关规范要求,整体刚度性能优越,具有良好的颤振稳定性,设置的风嘴能有效抑制涡激振动,采取加劲钢桁上弦杆灌注混凝土、延迟铺轨时间等措施能有效控制主梁的收缩徐变,桥面线形满足铺设无砟轨道的要求.
Design of Main Bridge of Hanjiang River Bridge Carrying a Section of Xi'an-Shiyan High-Speed Railway
The main bridge of Hanjiang River Bridge carrying a section of Xi'an-Shiyan High-speed Railway is a two-pylon,cable-stayed bridge of a semi-floating system and with a main span of 420 m.The superstructure consists of PC box girders stiffened with steel trusses,and the full deck width is 17 m.The four-cell PC box girders are made of C55 concrete,stiffened with variable triangular trusses of Q370qE steel,measuring 9.4 m in depth.The stay cables arranged in double fan planes are composed of parallel steel wires with a nominal tensile strength of 1 770 MPa.The pylons are vase-shaped reinforced concrete structures rising 186.5 m,supported by bored piles of 3 m diameter,but different lengths.The analysis shows that the indexes of the mechanical property of the bridge meet the code requirements,with sound overall stiffness and flutter stability.The wind fairings can effectively suppress the vortex-induced vibrations on the bridge.The upper chords of the steel trusses were injected with concrete,and the track placement time was delayed to effectively control the shrinkage and creep of the concrete girders.The deck alignment met the ballastless track placement requirements.

high-speed railway bridgecable-stayed bridgesemi-floating systemsteel-truss-stiffened PC box girderstay cablemechanical property analysisbridge design

康炜、卢皓

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西南交通大学土木工程学院,四川成都 610031

中铁第一勘察设计院集团有限公司,陕西西安 710043

高速铁路桥 斜拉桥 半飘浮体系 钢桁加劲PC箱梁 斜拉索 受力分析 桥梁设计

陕西省重点研发计划中国铁建股份有限公司科技研发计划中铁第一勘察设计院集团有限公司科研开发项目

2023-YBGY-1672021-C502021KY59YB-13

2024

10.20051/j.issn.1003-4722.2024.02.015

桥梁建设
中铁大桥局集团有限公司

桥梁建设

CSTPCD北大核心
影响因子：1.428
ISSN：1003-4722
年,卷(期)：2024.54(2)
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