大倾角钢箱提篮拱桥总体设计  

Overall Design of a Basket-Handle Arch Bridge with Steel Box Arch Ribs of Large Inclination Angle

作　　者：陈楚龙[1] 吴晓勤[1] 刘新华[1] 朱玉[1] CHEN Chulong;WU Xiaoqin;LIU Xinhua;ZHU Yu(CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430056,China)

机构地区：[1]中交第二公路勘察设计研究院有限公司,湖北武汉430056

出　　处：《世界桥梁》2024年第1期13-18,共6页World Bridges

摘　　要：考虑施工技术、经济性和景观效果等方面,陕西蔡家坡渭河特大桥主桥采用(35+210+35) m大倾角钢箱提篮拱桥。该桥采用摩擦摆和环向钢丝绳阻尼支座综合减隔震约束体系,以降低结构的地震响应。拱肋为单室等宽钢箱截面,采用主、副拱肋2条悬链线,主、副拱肋共面,设计为横向内倾20°的大倾角,在提高桥梁景观效果的同时,又有效提高了结构的整体稳定性;拱肋设钢-混结合段连接拱脚与混凝土拱座。桥面系采用自重较轻的正交异性钢桥面板结构。吊杆采用抗拉强度1 860 MPa的环氧柔性钢绞线。基础采用Φ2.5 m的钻孔灌注群桩,以抵抗软弱地质条件下荷载的竖向及水平作用力。该桥总体采用先梁后拱的施工方案。整体及局部有限元分析结果表明,桥梁结构力学性能均满足规范要求,设计安全可靠。The main bridge of Caijiapo Weihe River Bridge in Shaanxi Province is designed as a basket-handle arch bridge with a main span of 210 m and two side spans of 35 m,which makes a better balance of the construction techniques,economy and landscaping effect.A vibration mitigation system that consists of friction pendulums and looped steel rope damping bearings is installed to reduce the seismic responses of the structure.The steel arch ribs are of constant-width single-cell cross section.Inwardly inclining 20°in the transverse direction,the main and secondary arch ribs form two catenaries,but in the same plane,to improve aesthetic as well as the overall stability of the bridge.The deck consists of orthotropic steel panels,aiming to reduce the self-weight of the deck and effectively resist the thrust of the arches.The suspenders are composed of epoxy-coated flexible steel strands with a tensile strength of 1860 MPa.A steel-concrete joint section is set between the arch springing and the concrete skewback for smooth load transition.The skewback is supported by bored piles of 2.5 m diameter to effectively resist the vertical and horizontal forces in weak soils.The deck was constructed ahead of the arch.The numerical simulations of the overall bridge and local details demonstrate that the mechanical property of the bridge structure meet the code requirements,and the design is safe and reliable.

关 键 词：钢箱提篮拱桥 大倾角拱肋 减隔震约束体系 正交异性板 群桩基础 先梁后拱 桥梁设计 

分 类 号：U448.22[建筑科学—桥梁与隧道工程] U442.5[交通运输工程—道路与铁道工程]