基于POT理论的城市桥梁车辆荷载效应研究  

Research on Vehicle Load Effect of Urban Bridges Based on POT Theory

作　　者：王宁[1] 姜福香[1] 崔佳庆 周均法 WANG Ning;JIANG Fu-xiang;CUI Jia-qing;ZHOU Jun-fa(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)

机构地区：[1]青岛理工大学土木工程学院

出　　处：《北方交通》2019年第9期16-20,25,共6页Northern Communications

摘　　要：车辆荷载效应是桥梁设计中重要的技术指标之一,是对拟建桥梁荷载取值和现有桥梁安全性评估的重要依据。结合调查地区的车辆荷载数据,提出了相应的车辆荷载模型,运用蒙特卡洛法模拟密集和拥堵运行状态下荷载流,以各跨径简支梁桥(10~60m)跨中弯矩值为研究对象,进行影响线加载计算;运用Peak Over Threshold(POT)理论对效应尾部数据进行分析,由极值理论外推得不同设计基准期内车辆荷载效应值,并与《城市桥梁设计规范CJJ11-2011》规范值作对比分析,结果表明:密集运行状态下不同设计基准期内外推值是规范值的1.13~1.38倍,拥堵运行状态下是规范值的1.18~1.46倍。Vehicle load effect is one of the important technical indexes in bridge design, and it is also an important basis for the load value of the proposed bridge and the safety evaluation of existing bridges. Combining with the vehicle load data in the survey area, the corresponding vehicle load model is put forward. The Monte Carlo method is used to simulate the load flow under dense and congested operation conditions. The influence line load calculation is carried out by taking the mid-span bending moment of the simply supported beam bridge with span(10-60m)as the research object,and the effect end data is analyzed by utilizing the Peak Over Threshold(POT)theory.The vehicle load effect values in different design reference periods are extrapolated from the extreme value theory.The results are compared and analyzed with those in the Code for Design of Urban Bridges CJJ11-2011.The results show that:the extrapolation values in different design reference periods under the intensive operation condition are 1.13~1.38 times of the code values and those under the congestion operation condition are 1.18~1.46 times.

关 键 词：POT理论 城市桥梁 车辆荷载 荷载效应 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]