运用中、下承式拱桥吊杆张力变化进行吊杆损伤识别研究  

Damage identification of suspenders based on change of suspender tensions of through and half-through arch bridges

作　　者：何伟[1] 何容[1] 陈淮[2] 

机构地区：[1]华北水利水电学院土木与交通学院,郑州450011 [2]郑州大学土木学院,郑州450001

出　　处：《振动与冲击》2012年第5期153-157,175,共6页Journal of Vibration and Shock

基　　金：高等学校博士学科点专项科研基金(200804590006);河南省高等学校青年骨干教师资助计划(2010GGJS-127);华北水利水电学院高层次人才科研启动项目资助

摘　　要：考虑吊杆两端弹性支承及拱肋、系杆梁里设置的减振垫减振作用和拱肋、系杆梁附加质量等的影响,建立了复杂边界条件下吊杆张力与其横向振动频率之间解析表达式,以提高吊杆张力测试计算精度。基于摄动有限元理论研究了吊杆损伤时对吊杆系张力的影响,并提出了根据吊杆系张力变化进行吊杆损伤识别计算方法,以京港澳高速郑州黄河大桥为实例对计算公式进行验证。计算结果表明:该方法比较全面地考虑了吊杆实际边界条件,提高了短吊杆和长吊杆张力测试精度;采用本方法进行计算吊杆损伤识别,结果准确。Considering influences of elastic supports at both ends of a suspender, damping effect of shock pads in tied beams and arch ribs, and additional masses of tied beams and arch fibs, an analytical expression between the suspender tension and lateral vibration frequency was established under complex boundary conditions to improve the accuracy of suspender tension test. Based on perturbation finite element method, the effets of suspender damages on the suspender tensions were studied. A new method was proposed to identify suspender damage according to the change of suspender tensions, it was validated with an example of Zhenzhou Yellow River Bridge on Beijing-Hong Kong-Maeao expressway. The calculation results showed the test precision of suspender tension test is improved after considering the actual boundary conditions of suspenders, and according to the change of suspender tensions the damage identification results are correct.

关 键 词：中 下承式拱桥 吊杆 损伤识别 张力 频率 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]