独塔四索面空间异型斜拉桥的施工监控计算  

Calculation of Construction Monitoring and Control of a Spatial Irregular Shape Cable-Stayed Bridge with a Single Pylon and Four Cable Planes

作　　者：郑平伟[1] 陈金州[1] 于德伟[1] 

机构地区：[1]中铁大桥局集团桥科院有限公司,湖北武汉430034

出　　处：《桥梁建设》2011年第2期66-70,共5页Bridge Construction

摘　　要：宁波外滩大桥主桥采用独塔四索面空间异型斜拉桥结构,跨径布置为(225+82+30)m。为确保该桥施工安全,通过对结构受力模式的分析,明确了前塔柱"竖拼竖转法"施工、桥塔的弯矩、后锚点的安全及主梁行车舒适性是控制的重点。采用MIDAS Civil仿真该桥施工全过程,计算结果表明,该桥桥塔、主梁、斜拉索及后锚点在整个施工过程中均满足规范要求,且均存在一定的安全储备。通过监控参数对主梁竖向变形幅度的敏感性分析,确定施工监控时以控制斜拉索索力为主的原则。The main bridge of the Waitan Bridge in Ningbo is a spatial irregular shape cable-stayed bridge with a single pylon and four cable planes and with span arrangement（225＋82＋30） m.To ensure the construction safety of the bridge,through the analysis of mechanical behavior modes of the structure,it was determined that the front legs of the pylon would be constructed by the method of ＂vertical assembling and vertical rotation＂,the bending moment in the pylon,the safety of the rear anchor points and the riding comfort of the main girder were the critical points that would be controlled and by means of the MIDAS Civil,the whole construction process of the bridge was simulated and calculated.The results of the calculation showed that the pylon,main girder,stay cables and rear anchor points could all meet the relevant requirements in the codes and had certain safety margin in the construction.Further through the analysis of sensitivity of the monitoring and control parameters to the vertical deformation of the main girder,it was also determined that the principle of ＂mainly controlling the cable forces of the stay cables＂ would be abided by in the construction monitoring and control.

关 键 词：斜拉桥 有限元法 桥梁施工 施工监控 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U445.1[交通运输工程—道路与铁道工程]