基于智能锚具的PC加劲梁悬索桥预应力测试  

Test of Effective Prestressing Under Anchorage of Intelligent Anchorage of Suspension Bridge with PC Stiffened Girder

作　　者：陈旭 王昕 王晗 张峰[3] 高华睿 CHEN Xu;WANG Xin;WANG Han;ZHANG Feng;GAO Huarui(Shandong Luqiao Group Co.,Ltd.,Jinan,Shandong 250021,China;College of Communications and Civil Engineering,Shandong Jiaotong Universiy,Jinan,Shandong 250300,China;Geotechnical and Structural Engineering Research Center,Shandong University,Jinan,Shandong 250061,China)

机构地区：[1]山东省路桥集团有限公司,山东济南250021 [2]山东交通学院交通土建工程学院,山东济南250300 [3]山东大学岩土与结构工程研究中心,山东济南250061

出　　处：《施工技术》2020年第17期27-31,共5页Construction Technology

摘　　要：为了能有效监测超长预应力钢绞线的锚下有效预应力值,依托世界最大跨径的混凝土加劲梁悬索桥的超长预应力钢绞线(长461m)张拉工程,首次提出一种智能锚具,在锚具周边粘贴应变片测试锚具的力学特性,通过穿心式压力环同步测试验证了智能锚具测试数据的有效性。通过测试,研究了超长预应力钢绞线的孔道摩阻力、稳压时间、温度影响规律。基于精细化有限元数值模拟,验证了15孔智能锚具的测试标定公式的有效性。In order to effectively monitor the effective prestress of super-long prestressing steel strand under anchor,super-long prestressed steel strand(461 m long)of the world’s largest span suspension bridge with concrete stiffening girder is tested.Firstly,an intelligent anchor is proposed in the study,strain gauges are pasted on the anchorage to test mechanical properties of anchorage,test data of intelligent anchorage is verified by force sensors.Through testing,some factors of the super-long prestressing strand are studied,including the duct friction,stabilization time during tensioning construction stage and temperature on prestressing under anchors.Based on the refined finite element analysis,the calibration formula for 15-hole intelligent anchorage is verified.

关 键 词：桥梁工程 悬索桥 智能锚具 超长预应力束 持荷时间 有效预应力 有限元分析 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]