考虑钢筋腐蚀影响的隔震连续梁桥抗震性能分析

发布时间：2018-05-15 17:24

本文选题：钢筋腐蚀 + 腐蚀速率　；参考：《华中科技大学》2015年硕士论文

【摘要】：改革开放以来我国经济蓬勃发展,道路桥梁等重大基础设施的建设也在不断的趋于完善。截止到2011年底,我国公路桥梁的数量高达近70万座;其中,相当一部分公路桥梁的使用时间至今已达40年以上。随着时间的推移,越来越多公路桥不得不面对材料老化以及结构损伤的问题,老化桥梁的承载力以及抗震性能会发生严重的退化,因此本文主要针对既有桥梁的老化问题做下几个方面的研究:1、选择合理的钢筋腐蚀模型,基于OpenSees有限元分析平台对五个老化时间节点的隔震连续梁桥进行三维有限元建模,并对结构的进行模态分析。2、通过拉丁超立方采样(LHC)来考虑结构材料和钢筋腐蚀模型的不确定性,基于云图法对五个老化时间节点的隔震连续梁桥模型进行地震易损性分析。结果表明:随着时间的推移,全桥以及隔震支座的地震易损性增幅很小,而桥墩的地震易损性会有明显增加。3、对地震易损性公式中随时间变化的参数进行关于时间函数的二次拟合,从而得到可以快速预测任意时间节点的地震易损性公式。4、根据等超越概率原则对五个时间节点的地震作用值进行调整;另一方面,通过Pushover分析得到五个时间节点上的RC桥墩弹性地震抗力值。通过对比这两者的大小,以此来评价RC桥墩弹性抗震性能。
[Abstract]:Since the reform and opening up, China's economy has been booming, and the construction of major infrastructure, such as roads and bridges, has continued to improve. Up to the end of 2011, the number of highway bridges in our country is as high as 700000, among which, quite a few of them have been used for more than 40 years. With the passage of time, more and more highway bridges have to face the problems of material aging and structural damage. The bearing capacity and seismic performance of aging bridges will be seriously degraded. Therefore, this paper mainly aims at the aging problem of existing bridges in the following aspects: 1, select a reasonable corrosion model of steel bar, based on the OpenSees finite element analysis platform to carry on the three-dimensional finite element modeling of the five aging time nodes isolated continuous beam bridge. Based on the modal analysis of the structure and the uncertainty of structural material and reinforcement corrosion model, the seismic vulnerability analysis of the continuous beam bridge model with five aging time nodes is carried out by using Latin hypercube sampling (LHCC) to consider the uncertainty of structural material and reinforcement corrosion model. The results show that the increase of seismic vulnerability of the whole bridge and the isolation support is very small with the passage of time. However, the seismic vulnerability of bridge piers is obviously increased. The parameters of seismic vulnerability formula with time are fitted by quadratic fitting of time function. The seismic vulnerability formula .4 of any time node can be obtained quickly, and the seismic action value of five time nodes can be adjusted according to the principle of equal transcendental probability; on the other hand, The elastic seismic resistance of RC pier on five time nodes is obtained by Pushover analysis. The elastic seismic behavior of RC pier is evaluated by comparing the size of the two.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55

【相似文献】