基于桥梁监测系统振动响应的浮吊船-悬索桥主梁碰撞荷载估算与分析

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中文摘要：船桥意外碰撞事故具有突发性和难以预测性,此时碰撞物质量、碰撞速度与角度以及接触刚度等参数未知,导致无法确定真实的碰撞荷载大小,这给意外碰撞后桥梁的安全评估和修复决策带来困难.鉴于结构长期健康监测系统在重大桥梁中的广泛应用,其可用于记录突发碰撞时桥梁的振动响应,如何仅利用结构的振动响应来估算突发碰撞荷载大小成为一个亟需解决的问题.以浮吊船的起重臂与悬索桥主梁意外碰撞事故为背景,采用半正弦船桥碰撞荷载模式,建立该悬索桥的有限元模型,模拟计算24种不同碰撞工况时指定测点的振动响应峰值.数据拟合结果表明:主梁振动响应峰值与碰撞荷载峰值之间呈线性关系,且该线性曲线的斜率与碰撞持续时间有关,从而拟合出结构振动响应峰值、碰撞荷载峰值与碰撞持续时间三者之间的关系式,基于该式根据结构任意两点的碰撞振动响应峰值,便可估算出碰撞荷载峰值与持续时间.最后利用悬索桥健康监测系统记录的意外碰撞振动响应数据所估算得到的碰撞荷载模式,施加在桥梁的有限元模型进行碰撞计算.计算结果表明:主梁碰撞损伤深度和宽度与实际碰撞损伤区域尺寸吻合良好,验证了所建立的仅基于结构碰撞振动响应峰值估算意外碰撞荷载模式的方法合理性.所提方法不涉及动力学逆问题复杂的理论计算,简单实用,可用于安装了长期健康监测系统的重大桥梁意外碰撞时碰撞荷载的估算.

外文标题：Impact Force Estimation and Analysis of Collision Between Floating Crane and Main Girder of Suspension Bridge Using Vibration Responses in Bridge Monitoring System

外文摘要：Bridge accidents caused by ship collisions can be sudden or unpredictable.During these incidents,parameters such as the mass of the colliding object,collision speed and angle,and contact stiffness are unknown,making it impossible to determine the actual impact force.Subsequently,safety assessments and repair decision-making for bridges after accidental collisions are difficult.Given the widespread application of long-term structural health monitoring systems in large-scale bridges,the vibration responses of bridges during sudden ship-bridge collisions can be recorded effectively.Therefore,estimating the sudden impact force using only structural vibration responses has become an urgent problem that needs to be solved.This study considered a collision accident between the jib of a floating crane vessel and the main steel-boxed girder of a suspension bridge as an example.The established finite element model of the suspension bridge was used to calculate the vibration responses of the designated girder measurement points for 24 different impact loads in the semi-sine impact load mode.Data fitting indicated a linear relationship between the peak vibration response peaks of the girder and the impact force peaks.Moreover,the slope of the linear curve depends on the impact duration.Consequently,a relational expression was established among the peak values of the structural vibration responses,impact forces,and impact duration times.Thus,the peak value and duration of the impact force can be estimated based on the peak values of the vibration responses at any two points on the structure.Finally,the impact force was estimated using the proposed approach from the vibration responses of an unexpected collision accident between a floating crane and the main girder of a suspension bridge recorded in a bridge monitoring system.The estimated impact force was then applied to the finite element model of the suspension bridge for collision calculation.The results show that the calculated collision damage depth and width of the steel-boxed girder are consistent with those of the actual collision damage zone,verifying the proposed approach for estimating the accidental impact force based solely on the peak values of the structural collision vibration responses.This method does not involve complex theoretical calculations of dynamic inverse problems and is simple,practical,and applicable for estimating the impact force of unexpected ship-bridge collisions using long-term structural health monitoring systems.

外文关键词：

bridge engineeringship-bridge collisionfinite element modellingimpact forcecol-lision calculationvibration responsestructural health monitoring system

作者：

朱亚飞、任伟新、王亚飞

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作者单位：

合肥工业大学土木与水利工程学院,安徽合肥 230009

深圳大学极端环境绿色长寿道路工程全国重点实验室(深圳),广东深圳 518060

中铁大桥科学研究院有限公司,湖北武汉 430034

关键词：

桥梁工程船桥碰撞有限元模拟碰撞荷载碰撞计算振动响应结构健康监测

基金：

深圳市科创委项目深圳市科创委项目

项目编号：

JSGG20210802093207022KQTD20180412181337494

出版年：

2024

DOI：

10.19721/j.cnki.1001-7372.2024.09.009

中国公路学报

中国公路学会

中国公路学报

CSTPCD北大核心

影响因子：1.607

ISSN：1001-7372

年,卷(期)：2024.37(9)