斜度和支座剪切刚度对斜交连续梁桥自振周期的影响
|
摘要
为研究斜交连续梁桥地震反应的规律特征,有必要对其结构整体的动力特性开展深入分析。在研究中,首先建立了斜交连续梁桥有限元分析模型,利用模态分析方法,分别讨论了斜度和支座剪切刚度对斜交桥自振周期的影响作用。通过研究发现:桥梁第一阶周期随斜度的变化不明显;以扭转振动和以横向平动为主的第二、三阶周期显著增大。随着支座剪切刚度的增大,桥梁以平动为主的第一、三阶自振周期将呈减小趋势。对于以扭转为主的第二阶自振周期,随着支座剪切刚度的增大其量值变化不大,说明支座剪切刚度对于斜交桥的扭转振动影响作用不明显。
In order to study the seismic responses of skew continuous bridges,it is necessary to study the dynamic properties of the structure. In the research,the finite element analysis model was developed firstly and by the modal analysis method,the effects of the skew angles and the shear stiffness of the bearings on the dynamic properties of skew bridges were discussed. From the results,it can be concluded that the value of the first period varies little with the skew angles while the second period with the torsional mode and the third period with the transverse mode will be affected greatly. With the shear stiffness of the bearing increasing,the first and third periods with the translational modes will be decreased. The second period with the torsional mode will vary little. It indicates that there is few effects of the bearing shear stiffness on the torsional vibration.
In order to study the seismic responses of skew continuous bridges,it is necessary to study the dynamic properties of the structure. In the research,the finite element analysis model was developed firstly and by the modal analysis method,the effects of the skew angles and the shear stiffness of the bearings on the dynamic properties of skew bridges were discussed. From the results,it can be concluded that the value of the first period varies little with the skew angles while the second period with the torsional mode and the third period with the transverse mode will be affected greatly. With the shear stiffness of the bearing increasing,the first and third periods with the translational modes will be decreased. The second period with the torsional mode will vary little. It indicates that there is few effects of the bearing shear stiffness on the torsional vibration.
引文
[1]Meng,J Y,Lui,E M,Liu Y.Dynamic response of skew highway bridges[J].Journal of Earthquake and Engineering,2001,5(2):205-223.
[2]何旭辉,盛兴旺,陈政清.高速铁路PC斜交箱梁桥振动特性模型试验研究[J],铁道学报,2002,24(5):89-92.HE Xuhui,SHENG Xingwang,CHEN Zhengqing.Model test study of vibration characteristics on PC skew box girder bridge of Civil high speed railway[J].Journal of the China railway society,2002,24(5):89-92.(in Chinese)
[3]夏樟华,宗周红.三跨斜交T梁动力特性分析[J].振动与冲击,2007,26(4):147-150.XIA Zhanghua,ZONG Zhouhong.Dynamic analysis of a skewed T-girder bridge with three-spans[J].Journal of vibration and shock,2007,26(4):147-150.(in Chinese)
[4]JT/T 663―2006公路桥梁板式橡胶支座规格系列[S],北京:人民交通出版社,2006.JT/T 663―2006 Series of Elastomeric pad Bearings for Highway Bridges[S].Beijing:China Communication Press,2006.(in Chinese)
[2]何旭辉,盛兴旺,陈政清.高速铁路PC斜交箱梁桥振动特性模型试验研究[J],铁道学报,2002,24(5):89-92.HE Xuhui,SHENG Xingwang,CHEN Zhengqing.Model test study of vibration characteristics on PC skew box girder bridge of Civil high speed railway[J].Journal of the China railway society,2002,24(5):89-92.(in Chinese)
[3]夏樟华,宗周红.三跨斜交T梁动力特性分析[J].振动与冲击,2007,26(4):147-150.XIA Zhanghua,ZONG Zhouhong.Dynamic analysis of a skewed T-girder bridge with three-spans[J].Journal of vibration and shock,2007,26(4):147-150.(in Chinese)
[4]JT/T 663―2006公路桥梁板式橡胶支座规格系列[S],北京:人民交通出版社,2006.JT/T 663―2006 Series of Elastomeric pad Bearings for Highway Bridges[S].Beijing:China Communication Press,2006.(in Chinese)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心