| 高墩大跨度刚构桥抗震加固有限元分析 |
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| 引用本文： | 倪国葳,刘倩,韩冰,葛毅佳,张梦芽,张洪建.高墩大跨度刚构桥抗震加固有限元分析[J].世界地震工程,2019,35(2):193-202. |
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| 作者姓名： | 倪国葳 刘倩 韩冰 葛毅佳 张梦芽 张洪建 |
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| 作者单位： | 华北理工大学 建筑工程学院, 河北 唐山 063000 |
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| 摘 要： | 大跨刚构桥结构桥跨较长和受力复杂。为提高抗震性能，需要对加固前后的桥梁进行抗震性能研究。以某双肢薄壁型高墩大跨度刚构桥为背景，采用ANSYS程序APDL语言，对结构进行合理的参数选取、网格划分和边界约束，结合抗震等级和桥梁规范等有关规定，研究整体结构在地震作用下的变化规律。通过沿墩高方向获取节点的方法，确定在地震作用下，各节点的最大位移从下到上逐渐增大。选取桥墩双肢相同部位各节点进行横向比较，总结得出双肢薄壁桥墩具有平分荷载和延长寿命的特点。为提高桥梁整体抗震性能，采取联结桥墩增大截面的方式进行加固，对比加固前后两模型在同一地震作用下的结构响应，得出该方法在提高结构整体刚度方面，效果显著。
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| 关 键 词： | 刚构桥梁 地震动 动态时程分析 有限元分析 加固 |
Finite element analysis on seismic reinforcement of long-span rigid frame bridge with high piers |
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| NI Guowei,LIU Qian,HAN Bing,GE Yijia,ZHANG Mengya,ZHANG Hongjian.Finite element analysis on seismic reinforcement of long-span rigid frame bridge with high piers[J].World Information On Earthquake Engineering,2019,35(2):193-202. |
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| Authors: | NI Guowei LIU Qian HAN Bing GE Yijia ZHANG Mengya ZHANG Hongjian |
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| Affiliation: | College of Civil Architectural Engineering, North China University of Science and Technology, Tangshan 063000, China |
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| Abstract: | The long-span rigid frame bridge has a long-span and complicated stress state. In order to improve its seismic performance, it is necessary to study the seismic behaviors of the bridge before and after reinforcement. In this study, the two-limb and thin-walled rigid frame bridge with the high piers and long-spans are investigated and its parameters, mesh and boundary constraints are reasonably selected by using the APDL language of ANSYS program. Considering the relevant regulations on the aseismic intensities and bridge specifications, the seismic behavior of the whole structure is examined. By obtaining responses of the nodes along the height direction of the pier, it can be found that the maximum displacement of each node subjected to the earthquake gradually increases from the bottom to top. The nodes at the same locations of the two limbs of the bridge pier are compared. It is concluded that the thin-walled pier exhibits the equal load to its two limbs and a prolonged service life. In order to improve the overall seismic performance of the bridge, the method of connecting the piers is employed to increase the cross section of the bridge piers to reinforce the bridge. The structural responses are compared between the two models before and after the reinforcement subjected to the same earthquake, and it is concluded that the proposed method can improve the overall stiffness of the structure significantly. |
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| Keywords: | rigid frame bridge earthquake dynamic time history analysis finite element analysis reinforcement |
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