挡块对隔震桥梁地震响应影响的研究
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摘要
本文对设有挡块的隔震连续梁桥地震激励下的反应进行了研究,考虑挡块刚度、初始设置间距对隔震桥梁地震响应的影响,分析了设置挡块后隔震桥梁主梁与挡块之间的碰撞作用以及桥墩剪力和弯矩的变化。计算结果表明,挡块的刚度及设置间距对桥梁下部结构动力响应影响较大,甚至可能导致桥墩的破坏。在此基础上提出了在桥梁抗震设计中合理设置挡块的相关建议。
The anti-knock block( AKB) design in bridge structure was one of the most popular methods to stop the deck falling and damage. However,AKB was often damaged in earthquake,it was necessary to study the parameters related to AKB for exploring its damage mechanism. The seismic response of AKB system in an isolated continuous bridge has been studied in this paper. By changing the stiffness of AKB and the initial distance between the girder and AKB,the collision forces on AKB and the impact on the seismic response of isolated bridge after setting AKB were analyzed. The results show that the stiffness of AKB and the initial spacing play an important role on the dynamic response of bridge substructure,and may even lead to destruction of the piers. The article proposed some advices in setting AKB reasonably in isolated bridges.
The anti-knock block( AKB) design in bridge structure was one of the most popular methods to stop the deck falling and damage. However,AKB was often damaged in earthquake,it was necessary to study the parameters related to AKB for exploring its damage mechanism. The seismic response of AKB system in an isolated continuous bridge has been studied in this paper. By changing the stiffness of AKB and the initial distance between the girder and AKB,the collision forces on AKB and the impact on the seismic response of isolated bridge after setting AKB were analyzed. The results show that the stiffness of AKB and the initial spacing play an important role on the dynamic response of bridge substructure,and may even lead to destruction of the piers. The article proposed some advices in setting AKB reasonably in isolated bridges.
引文
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[3]王岩,王军文,秦洪果,等.桥梁抗震挡块研究进展[J].世界地震工程,2013.29(S2):90-06.WANG Yan,WANG Junwen,QIN Hongguo,et al.Review of recent development in seismic shear keys of bridges[J].World Earthquake Engineering.2013.29(S2):90-06.(in Chinese)
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[5]朱文正,徐忠根.隔震桥梁横桥向挡块设计研究[J].土木工程与管理学报,2011,28(3):08-11.ZHU Wenzheng,XU Zhonggen.Study of isolated bridge shear keys design in transverse.[J].Journal of Civil Engineering and Management,2011,28(3):08-11.(in Chinese)
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[2]JTG/T B02-01-2008桥梁抗震设计细则[S].北京:人民交通出版社,2008.JTG/T B02-01-2008 Code for Seismic Design of Bridges[S].Beijing:People's Communications Press,2008.(in Chinese)
[3]王岩,王军文,秦洪果,等.桥梁抗震挡块研究进展[J].世界地震工程,2013.29(S2):90-06.WANG Yan,WANG Junwen,QIN Hongguo,et al.Review of recent development in seismic shear keys of bridges[J].World Earthquake Engineering.2013.29(S2):90-06.(in Chinese)
[4]李鸿晶,陆呜,温增平,等.汶川地震桥梁震害的特征[J].南京工业大学学报,2009,31(1):25-29.LI Hongjing,LU Ming,WEN Zengping,et al.Character of bridge damages in Wenchuan earthquake.[J].Journal of Nanjing University of technology(Science Edition).2009,31(1):25-29.(in Chinese)
[5]朱文正,徐忠根.隔震桥梁横桥向挡块设计研究[J].土木工程与管理学报,2011,28(3):08-11.ZHU Wenzheng,XU Zhonggen.Study of isolated bridge shear keys design in transverse.[J].Journal of Civil Engineering and Management,2011,28(3):08-11.(in Chinese)
[6]王志强.隔震桥梁分析方法及设计理论研究:[D].上海:同济大学土木工程学院,2000.WANG Zhiqiang.Research of analysis method and design theory of isolated bridges.[D].Shanghai:Tongji University,2000.(in Chinese)
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