系梁对加固柱式桥墩抗震性能的影响
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摘要
以西安市某座抗震加固桥为列,分别以系梁设置位置、系梁刚度大小来探讨系梁对柱式桥墩抗震性能的影响,研究结果表明系梁对纵桥向振动没有影响,而对横桥向振动有较大影响,增加横桥向刚度,减小1、2阶横向振型的振动周期;选择系梁在桥墩中心可以提前使系梁在地震作用下进入塑性状态,消耗地震能量,利于抗震;当横系梁的高度选择为0.7D~0.85D,宽度选择为0.6D~0.75D时,对桥梁抗震有利。
Taking a seismic reinforcement bridge in Xi'an for example, this paper studied the effect of the location and stiffness of tie beam on column piers seismic behavior. The results showed that tie beam had no effect on the longitudinal vibration of the bridge, but had a great impact on the lateral vibration of the bridge. First-order and second-order of transverse vibration period could reduce by increasing the transverse stiffness. Setting the tie beam at the center of pier could advance the tie beam enter into the plastic state under earthquakes and consume the earthquake energy. When the height of beam was 0.7D~0.85 D and the width was 0.6D~0.75 D, it was beneficial to bridge seismic.
Taking a seismic reinforcement bridge in Xi'an for example, this paper studied the effect of the location and stiffness of tie beam on column piers seismic behavior. The results showed that tie beam had no effect on the longitudinal vibration of the bridge, but had a great impact on the lateral vibration of the bridge. First-order and second-order of transverse vibration period could reduce by increasing the transverse stiffness. Setting the tie beam at the center of pier could advance the tie beam enter into the plastic state under earthquakes and consume the earthquake energy. When the height of beam was 0.7D~0.85 D and the width was 0.6D~0.75 D, it was beneficial to bridge seismic.
引文
[1]JTG/T B02-01—2008公路桥梁抗震设计细则[S].
[2]李健刚,杜玉东,魏燕玲,等.横系梁对双肢薄壁高墩刚构桥稳定性的影响分析[J].铁道工程学报,2008(11):31-34.
[3]范立础.桥梁工程(上)[M].北京:人民交通出版社,2001.
[4]杨沪湘,许航.高烈度地震山区桥梁抗震设计研究[J].公路,2009(8):246-250.
[2]李健刚,杜玉东,魏燕玲,等.横系梁对双肢薄壁高墩刚构桥稳定性的影响分析[J].铁道工程学报,2008(11):31-34.
[3]范立础.桥梁工程(上)[M].北京:人民交通出版社,2001.
[4]杨沪湘,许航.高烈度地震山区桥梁抗震设计研究[J].公路,2009(8):246-250.
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