赣州市武陵大桥主桥桥型构思及结构设计  

Bridge Type Selection and Structural Design for Main Bridge of Wuling Bridge in Ganzhou

作　　者：徐力[1] 龚俊[1] 梅新咏[1] 

机构地区：[1]中铁大桥勘测设计院集团有限公司,湖北武汉430056

出　　处：《世界桥梁》2015年第4期6-10,共5页World Bridges

摘　　要：赣州市武陵大桥项目线路全长约1 700m,主桥跨越章江,景观要求主桥为带桥头堡的五孔拱桥,且单孔为坦拱。根据景观要求,通过桥型方案对比分析,推荐主桥采用（72＋78＋80＋78＋72）m五跨钢筋混凝土拱桥,桥面宽度35.5m。结构设计确定,主拱圈拱轴系数为2.0,各跨矢跨比依次为1/7.3、1/6.8、1/6.6、1/6.8、1/7.3;主（腹）拱圈横桥向分成4片,每片均为由拱脚至拱顶截面逐渐变高的单箱双室结构;主拱脚采用拱顶顶推合龙的无铰拱结构,腹拱脚采用两铰拱结构;桥面梁采用结构重量轻且现浇工程量少的π形梁;1号∽5号中间墩采用钻孔灌注桩基础,两端1号、6号桥墩采用重力式抗水平力扩大基础。The full length of the Wuling Bridge Project in Ganzhou is 1700 m.For the landscape effect,the main bridge across the Zhangjiang River is required to be designed as a five-span arch bridge with bridge heads,and the single span must be flat arch.By bridge type scheme comparison and selection,the recommended scheme for the main bridge is a five-span reinforced concrete arch bridge with span arrangement of（72＋78＋80＋78＋72）m and deck width of 35.5m.In the structural design,the arch axis coefficient of the main arch ribs adopts 2.0,and the rise-tospan ratios for the spans 1/7.3,1/6.8,1/6.6,1/6.8,1/7.3,respectively.The main（spandrel）arch ribs are transversely divided into four pieces,each being the two-cell single box structure with cross section increasing in height from the arch spring to the arch crown.The main arch spring is the unhinged arch structure with the arch crown closed by pushing while the spandrel arch spring adopts the two-hinge arch structure.The deck beam is the light-weightπ-shaped beam with small cast-in-situ amount.The intermediate piers（piers N0.2∽N0.5）adopt the bored pile foundations,whereas the two side piers（pier N0.1and pier N0.6）adopt the gravity spread foundation which are able to resist horizontal force.

关 键 词：拱桥 主拱 腹拱 无铰拱结构 顶推措施 拱座 抗剪结构 抗水平力扩大基础 桥梁设计 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]