摘要
以贵黔高速鸭池河大桥为工程背景,考虑钢桁梁斜拉桥施工时的不确定性参数的概率分布和数值特征,以构件应力限值构造功能函数,基于随机有限元发展了一套适合于混合梁斜拉桥施工全过程可靠性分析的方法,并选取七个关键施工工况进行了计算。结果表明,由于各误差参数的随机分布基本上都服从正态分布且相互独立,计算得到的各种工况下主要构件的应力分布均不拒绝正态分布,混凝土主梁、钢桁梁、混凝土主塔和其他主要构件的最低可靠度指标均大于4.7,失效概率均小于1E-6,在施工期具有很高的可靠度。
Based on the engineering background of Yachi River Bridge in Gui-Qian Expressway,a new method for analyzing the reliability of hybrid girder cable-stayed bridge construction is proposed.Based on the stochastic finite element(SFEM),the new approach takes into account the distribution and numeric feature of the structural parameters with uncertainty in the bridge construction,and construct the performance function on account of the limiting value of bridge components stress.Then,Seven key construction conditions are selected to calculated by this method,the results show that,due to the random distribution of structural parameter errors obeys the normal distribution and mutually independent,the calculate stress distribution of the main bridge components under different load cases obeys the normal distribution.Meanwhile,the minimum reliability index of the main bridge components are greater than 4.7,and their failure probability are less than 1E-6,these results verify that the Yachi River Bridge has a higher dependability during the whole construction process.
作者
张慧
王文科
陈楚龙
孙远
张朋
Hui Zhang;Wenke Wang;Chulong Chen;Yuan Sun;Peng Zhang(Road and Bridge International Eastern China Co.,Ltd Shanghai 200135,China;CCCC First Harbor Engineering Company LTD.,TianJing 300461,China;CCCC Second Highway Consultants Co.Ltd,Wuhan 430056,China;School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《青海交通科技》
2019年第6期101-108,共8页
Qinghai Transportation Science and Technology
基金
国家自然科学青年基金项目资助(编号:51408249)
关键词
钢桁梁-混凝土混合梁
斜拉桥
施工误差
可靠性分析
steel truss-concrete hybrid beam
cable-stayed bridge
construction error
reliability analysis
