斜拉桥合理横向抗震约束体系研究
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摘要
传统的斜拉桥横向塔、梁连接方式为主从约束,地震作用下抗风支座及塔底地震内力较大。基于附加刚度和附加阻尼改善大跨径桥梁结构性能的设计思想,以水东湾大桥为研究对象,研发了一种新型弹性阻尼抗风支座(简称EDWR支座)。通过实验测试EDWR支座的性能,比较3种塔、梁横向约束体系,即横向主从约束、弹性约束、弹性阻尼约束对斜拉桥地震响应的影响。分析表明:对于斜拉桥,尤其是大跨度斜拉桥,横向主从和弹性约束体系不是理想的横向抗震体系;横向弹性阻尼约束体系可以显著减小结构的横向内力和抗风支座反力,是一种适宜于斜拉桥横桥向的抗震约束体系。
The traditional connection between pylon and girder of cable-stayed bridge is fixed,which will cause big force to the end of pylons and wind-resistance bearings. Taking the ShuiDong Bay cable-stayed bridge as a studying object,according to the design idea of improving the structural performance by adding additional stiffness and damping to find out the appropriate lateral seismic structural system for cable-stayed bridge,researched a new kind of elastic-damping wind-resistance bearing( EDWR bearing),which was certified by full-scaled experiment. The influences of fixed system,elastic system,elastic-damping system on the seismic response of cable-stayed bridge were invested. The result indicate that,for a cable-stayed bridge,especially a super-long-span cable-stayed bridge,lateral fixed system and elastic system are not appropriate seismic-constraint system; elastic-damping system can effectively reduce the lateral structure force and wind-resistance bearing force,which is a suitable lateral seismic-constraint system for cable-stayed bridge.
The traditional connection between pylon and girder of cable-stayed bridge is fixed,which will cause big force to the end of pylons and wind-resistance bearings. Taking the ShuiDong Bay cable-stayed bridge as a studying object,according to the design idea of improving the structural performance by adding additional stiffness and damping to find out the appropriate lateral seismic structural system for cable-stayed bridge,researched a new kind of elastic-damping wind-resistance bearing( EDWR bearing),which was certified by full-scaled experiment. The influences of fixed system,elastic system,elastic-damping system on the seismic response of cable-stayed bridge were invested. The result indicate that,for a cable-stayed bridge,especially a super-long-span cable-stayed bridge,lateral fixed system and elastic system are not appropriate seismic-constraint system; elastic-damping system can effectively reduce the lateral structure force and wind-resistance bearing force,which is a suitable lateral seismic-constraint system for cable-stayed bridge.
引文
[1]范立础,胡世德,等.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.
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[3]张喜刚,裴岷山,等.苏通大桥主桥结构体系研究[J].中国工程科学,2009(3):20-25.
[4]叶爱君,胡世德,等.斜拉桥抗震结构体系研究[J].桥梁建设,2002(4):1-4.
[5]李建中,袁万城.斜拉桥减震、耗能体系非线性纵向地震反应分析[J].中国公路学报,1998(1):71-76.
[6]王志强,胡世德,等.东海大桥粘滞阻尼器参数研究[J].中国公路学报,2005(3):37-42.
[7]张永亮,陈兴冲,等.塔梁间纵向弹性约束对铁路斜拉桥动力特性及地震反应的影响[J].铁道科学与工程学报,2011(2):21-26.
[8]高永,刘慈军,等.阻尼器和弹性索组合使用对大跨斜拉桥地震反应的影响[J].结构工程师,2008(5):71-76.
[9]叶爱君,范立础.超大跨度斜拉桥的横向约束体系[J].中国公路学报,2007(2):63-67.
[10]刘伟庆,徐秀丽,等.大跨度斜拉桥结构横向消能减震设计方法[J].振动工程学报,2006(3):426-432.
[11]傅士才.斜拉桥结构横向减震设计研究[J].公路交通科技(应用技术版),2007(11):103-106.
[12]冯云成,燕斌.弹性索和阻尼器对斜拉桥横向抗震性能的影响[J].工程抗震与加固改造,2009(4):24-28.
[2]张喜刚,陈艾荣.千米级斜拉桥———结构体系、性能与设计[M].北京:人民交通出版社,2010.
[3]张喜刚,裴岷山,等.苏通大桥主桥结构体系研究[J].中国工程科学,2009(3):20-25.
[4]叶爱君,胡世德,等.斜拉桥抗震结构体系研究[J].桥梁建设,2002(4):1-4.
[5]李建中,袁万城.斜拉桥减震、耗能体系非线性纵向地震反应分析[J].中国公路学报,1998(1):71-76.
[6]王志强,胡世德,等.东海大桥粘滞阻尼器参数研究[J].中国公路学报,2005(3):37-42.
[7]张永亮,陈兴冲,等.塔梁间纵向弹性约束对铁路斜拉桥动力特性及地震反应的影响[J].铁道科学与工程学报,2011(2):21-26.
[8]高永,刘慈军,等.阻尼器和弹性索组合使用对大跨斜拉桥地震反应的影响[J].结构工程师,2008(5):71-76.
[9]叶爱君,范立础.超大跨度斜拉桥的横向约束体系[J].中国公路学报,2007(2):63-67.
[10]刘伟庆,徐秀丽,等.大跨度斜拉桥结构横向消能减震设计方法[J].振动工程学报,2006(3):426-432.
[11]傅士才.斜拉桥结构横向减震设计研究[J].公路交通科技(应用技术版),2007(11):103-106.
[12]冯云成,燕斌.弹性索和阻尼器对斜拉桥横向抗震性能的影响[J].工程抗震与加固改造,2009(4):24-28.