随机车载下的桥梁车致位移极值预测  

Extreme value prediction of the vehicle-induced displacement of a bridge under random vehicle load

作　　者：赵辉 陈水生[2] 李锦华[2] 陈潇 ZHAO Hui;CHEN Shuisheng;LI Jinhua;CHEN Xiao(College of Architecture and Civil Engineering,Xinyang Normal University,Xinyang 464000,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]信阳师范学院建筑与土木工程学院,河南信阳464000 [2]华东交通大学土木建筑学院,江西南昌330013

出　　处：《哈尔滨工程大学学报》2023年第2期219-225,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(12062006,11962006);信阳市2022年科技发展计划(20220068)。

摘　　要：为了准确预测随机车辆荷载作用下的桥梁车致位移极值,本文充分考虑过桥车辆的随机性特征,采用蒙特卡罗随机抽样的方法建立随机车流荷载模型;基于经典Rice公式极值预测理论,给出公路桥梁车致位移极值的预测方法。实际工程的应用结果表明:经典Rice公式对桥梁车致位移界限跨阈次数的拟合效果很好,提出的桥梁车致位移极值预测方法有效可靠且在工程实践中应用方便。中小跨径桥梁在随机车载作用下的位移界限跨阈率取决于过桥车辆数量,受过桥车辆间距的影响较小。桥梁车致位移极值随着重现期的增加而增大,梁式桥边梁的车致位移极值和位移首超失效概率大于其他主梁。To accurately predict the extreme value of the vehicle-induced displacement of a bridge under random vehicle load,the Monte Carlo random sampling method was used to establish a random traffic flow load model,which fully considered the randomness characteristics of vehicles crossing the bridge.On the basis of the extreme value prediction theory of the classical Rice formula,we proposed a prediction method for the vehicle-induced displacement extreme value of highway bridges.The results of engineering applications show that the classical Rice formula has a good fitting effect on the threshold crossing times of the vehicle-induced displacement limit of bridges.The prediction method for the extreme value of vehicle-induced displacement of bridges is effective,reliable,and convenient for application in engineering practice.The displacement threshold crossing rate of small-and medium-span bridges under random vehicle load mainly depends on the number of vehicles crossing the bridge and is less affected by the distance between these vehicles.The extreme value of the vehicle-induced displacement of the bridge increases with an increasing return period.The extreme value of vehicle-induced displacement and the failure probability of the first excess displacement of the side beam of a beam bridge are greater than those of other main beams.

关 键 词：极值预测 随机车流 经典Rice公式 蒙特卡罗法 界限跨阈率 首超失效概率 位移影响面 公路桥梁 

分 类 号：TU441.3[建筑科学—岩土工程]