摘要
为探究各参数对桥梁结构的影响程度,文章以某大跨度连续刚构桥为背景,运用有限元分析软件Midas Civil建模进行参数敏感性分析。文中选取主梁自重、主梁混凝土弹性模量、预应力损失和混凝土收缩徐变等参数作为研究对象,通过对参数调整一定的幅度模拟施工过程中可能出现的误差,计算分析得到该状态下结构的内力、线形和应力情况,与基准状态进行对比,得到参数对结构在成桥状态时的影响程度,从而判别区分主要敏感因素和次要敏感因素。结果表明:主梁自重、预应力损失和混凝土收缩徐变属于主要敏感性参数,应作为施工监控的重点;主梁混凝土弹性模量属于次要敏感性参数。
To explore the influence of the parameters on the bridge structure,this paper takes a long-span continuous rigid frame bridge as the background and uses the finite element analysis software Midas Civil to model and analyze the parameter sensitivity.In this paper,the self-weight of the main beam,the elastic modulus of the main beam concrete,prestress loss and concrete shrinkage,and creep were selected as the research objects.By adjusting the parameters to a certain extent,the possible errors in the construction process were simulated and the internal force,line shape,and stress of the structure under this state were calculated and analyzed.Compared with the reference state,the influence of parameters on the structure in the completed bridge state was obtained to distinguish the primary and secondary sensitive factors.The results show that the main beam weight,prestress loss,and concrete shrinkage and creep are the main sensitive parameters,which should be the focus of construction monitoring;the elastic modulus of main beam concrete belongs to the secondary sensitive parameter.
作者
姜洪伟
云利华
JIANG Hong-wei;YUN Li-hua
出处
《内蒙古公路与运输》
2021年第4期30-34,共5页
Highways & Transportation in Inner Mongolia
关键词
刚构桥
施工控制
误差分析
参数敏感性
结构参数
rigid frame bridge
construction monitoring
error analysis
parameter sensitivity
structural parameter
