某钢筋混凝土栈桥的异常振动成因分析  

Analysis of the Causes of Abnormal Vibration of Reinforced Concrete Trestle

作　　者：鲁文妍[1] 陈亮[1] 曹翔宇 郑春锋[2] 刘海祥[1] 许珉凡 LU Wenyan;CHEN Liang;CAO Xiangyu;ZHENG Chunfeng;LIU Haixiang;XU Minfan(Nanjing Hydraulic Research Institute Nanjing,210029,China;Suzhou Administration Bureau of Taihu Basin Authority Suzhou,215011,China)

机构地区：[1]南京水利科学研究院,南京210029 [2]太湖流域管理局苏州管理局,苏州215011

出　　处：《振动．测试与诊断》2024年第1期94-99,199,共7页Journal of Vibration,Measurement & Diagnosis

基　　金：国家重点研发计划资助项目(2020YFC1511905);江苏省自然科学青年基金资助项目(BK20220206);中央级公益性科研院所基本科研业务费专项资金资助项目(Y422003)。

摘　　要：为研究栈桥异常振动原因并对结构进行安全性评估,在缺失结构异常振动期间观测数据的情况下,基于现场检测、动力测试及数值仿真3种方式相结合,将导致异常振动的内因和外因逐一排查,筛选高可能性因素进行异常振动成因分析。研究表明,栈桥的异常振动是由水平承载系统的第2阶自振频率与激振频率共振以及托辊转速较小差异导致的“拍现象”综合导致。其中,托辊对栈桥产生的拉扯激振是导致其异常振动的主要因素。该研究成果可为类似水运工程结构的异常振动成因分析提供参考价值。The abnormal vibration for reinforced concrete trestles is a typical abnormal phenomenon during the operation of such projects.In order to find out the cause of the abnormal vibration and evaluate the safety of the structure,the internal and external causes that may lead to the abnormal vibration are investigated based on the combination of on-site detection and investigation,dynamic measurement and numerical simulation.Finally,the factors with high possibility are discriminated and screened,and the causes of abnormal vibration are analyzed.The research results show that the abnormal vibration of the trestle is caused by the"beat phenomenon"caused by the resonance of the second-order natural frequency and the excitation frequency of the horizontal bearing system,the small difference in the rotation speed of the idler.Among them,the pulling vibration generated by the idler on the trestle is the main factor that causes its abnormal vibration.This study provides reference value for the cause analysis of abnormal vibration of similar waterway engineering structures.

关 键 词：栈桥 异常振动 动力测试 数值仿真 安全性评估 

分 类 号：U656.1[交通运输工程—港口、海岸及近海工程] TH17[交通运输工程—船舶与海洋工程]