钢管混凝土拱桥可靠度分析  

Reliability analysis of concrete-filled steel tubular arch bridge

作　　者：康海贵[1] 张晶[1] 余大胜[1,2] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]上海建工集团,上海200022

出　　处：《大连理工大学学报》2011年第2期226-229,共4页Journal of Dalian University of Technology

摘　　要：为了研究由于施工产生的误差对结构可靠度的影响,针对钢管混凝土拱桥的特点,采用应力叠加法(也即极限状态设计法)模拟了钢管混凝土拱桥成桥过程,运用响应面法结合FORM计算了结构体系可靠度.分别计算了拱桥拱轴线设计高度及拱轴线下降0.3m两种荷载工况下的结构体系可靠度.计算结果表明按1/2跨截面影响线布载时桥梁的可靠指标最低;在这种最不利工况下,拱轴线下降前后的结构体系失效概率变化较大,下降0.3m后的失效概率是设计时的5.2倍,相应的可靠指标也由设计拱轴线时的3.04下降为2.44.In order to study the effect on structural reliability of concrete-filled steel tubular（CFST） arch bridge due to construction errors,aiming at the characteristics of CFST arch bridge,using the stress superposition method（limit state design method） to simulate CFST arch bridge construction process,the structural reliability of CFST arch bridge is studied by using the response surface method（RSM） combined with the first-order reliability method（FORM）.The structural system reliability of CFST arch bridge under different loads is analyzed in the following two working conditions： the design height of normal axis of arch bridge is correct and falls in 0.3 m.The results show that if the loading is put on the bridge according to the influence line of 1/2 span length,the failure probability is the biggest.Under the most unfavorable working conditions,it can be found that if the normal axis of arch bridge falls in 0.3 m,the failure probability is the 5.2 times of the original design conditions,and the corresponding reliability index decreases from 3.04 to 2.44.

关 键 词：钢管混凝土拱桥 主拱圈 主拱位移偏差 结构体系可靠度 

分 类 号：U416.21[交通运输工程—道路与铁道工程]