高墩大跨度刚构桥抗震加固有限元分析
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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。
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.
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.
引文
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[7]王统宁,靳启文,胡兆同,等.连续梁桥施工阶段地震响应及抗震性能评估[J].郑州大学学报(工学版),2013,34(4):19-23.WANG Tongning,JIN Qiwen,HU Zhaotong,et al. Seismic response and seismic performance evaluation of continuous beam bridges in construction stage[J]. Journal of Zhengzhou University(Engineering Edition),2013,34(4):19-23.(in Chinese)
[8] ZHANG L. Seismic response analysis under longitudinal and lateral excitation of rigid frame bridge subjected to near-fault pulse-like ground motions[C]//International Conference on Multimedia Technology. IEEE,2011:1697-1700.
[9]葛毅佳.高墩大跨度刚构桥抗震加固有限元分析[D].唐山:华北理工大学硕士学位论文. 2018,3.GE Yijia. Finite element Analysis of Seismic Reinforcement of Long-Span Rigid Frame Bridge with High Piers[M]. Tangshan:Master thesis of North China University of Science and Technology. 2018,3.(in Chinese)
[2]甄宁.高墩大跨连续刚构桥地震响应分析研究[D].西安:长安大学,2016.ZHEN Ning. Seismic response analysis of long-span continuous rigid frame bridge with high piers[D]. Xi'an:Changan University,2016.(in Chinese)
[3]何钦象,田小红,宋丹.高墩大跨径连续刚构桥抗震性能评估[J].振动与冲击,2009,28(1):68-71.HE Qinxiang,TIAN Xiaohong,SONG Dan. Seismic performance evaluation of high pier and large span continuous rigid frame bridge[J]. Vibration and Shock,2009,28(1):68-71.(in Chinese)
[4] NING X J,ZHOU Y T. Analysis for seismic response of long span rigid frame bridge[J]. Advanced Materials Research,2011,194-196:1962-1966.
[5]刘晓露.高墩大跨连续刚构桥稳定性分析[D].重庆:重庆交通大学. 2012.LIU Xiaolu. Stability analysis of long-span continuous rigid frame bridge with high piers[D]. Chongqing:Chongqing Jiaotong University. 2012.(in Chinese)
[6]张方.大跨度预应力混凝土梁桥时变性能及分析方法研究[D].成都:西南交通大学. 2011.ZHANG Fang. Study on time-varying performance and analytical method of large span prestressed concrete beam bridge[D]. Chengdu:Southwest Jiao Tong University. 2011.(in Chinese)
[7]王统宁,靳启文,胡兆同,等.连续梁桥施工阶段地震响应及抗震性能评估[J].郑州大学学报(工学版),2013,34(4):19-23.WANG Tongning,JIN Qiwen,HU Zhaotong,et al. Seismic response and seismic performance evaluation of continuous beam bridges in construction stage[J]. Journal of Zhengzhou University(Engineering Edition),2013,34(4):19-23.(in Chinese)
[8] ZHANG L. Seismic response analysis under longitudinal and lateral excitation of rigid frame bridge subjected to near-fault pulse-like ground motions[C]//International Conference on Multimedia Technology. IEEE,2011:1697-1700.
[9]葛毅佳.高墩大跨度刚构桥抗震加固有限元分析[D].唐山:华北理工大学硕士学位论文. 2018,3.GE Yijia. Finite element Analysis of Seismic Reinforcement of Long-Span Rigid Frame Bridge with High Piers[M]. Tangshan:Master thesis of North China University of Science and Technology. 2018,3.(in Chinese)