横撑布置对钢结构拱桥地震响应的影响研究
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摘要
以一座地震区钢结构拱桥为研究背景,设计了横撑在拱顶处交叉布置,在1/4拱肋处交叉布置及在1/4拱肋处平行布置三种不同方案。首先进行模态分析,然后采用非线性时程分析对其地震响应进行研究。研究结果表明:横撑在拱顶处交叉布置能够更好的降低纵向地震作用力下拱肋的内力,横撑在1/4拱肋处平行布置能够降低横向地震作用力下拱肋的轴力,总体而言,横撑在拱顶处交叉布置能够更大限度的降低拱肋的内力响应。
Taking the steel structure arch bridge in a seismic area as the research background,three different schemes of cross bracing arranged at the vault,intersecting at the 1/4 arch rib and parallel arrangement at the 1/4 arch rib are designed. First,modal analysis was performed,and then nonlinear seismic analysis was used to study its seismic response. The results show that the cross bracing at the vault can better reduce the internal force of the arch rib under the longitudinal earthquake force. The parallel bracing at the quarter arch rib can reduce the axial force of the arch rib under the lateral seismic force. In general,the cross struts arranged at the vaults can have a greater limit to reduce the internal force response of the arch ribs.
Taking the steel structure arch bridge in a seismic area as the research background,three different schemes of cross bracing arranged at the vault,intersecting at the 1/4 arch rib and parallel arrangement at the 1/4 arch rib are designed. First,modal analysis was performed,and then nonlinear seismic analysis was used to study its seismic response. The results show that the cross bracing at the vault can better reduce the internal force of the arch rib under the longitudinal earthquake force. The parallel bracing at the quarter arch rib can reduce the axial force of the arch rib under the lateral seismic force. In general,the cross struts arranged at the vaults can have a greater limit to reduce the internal force response of the arch ribs.
引文
[1]罗晓峰,项贻强,吴天真.基于性能的独柱桥墩抗震优化设计方法[J].中国公路学报,2014,27(7):85-90,126.
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[4]张晨,徐勋倩,陈静.中承式钢管混凝土拱桥地震响应分析[J].中外公路,2013,33(2):88-91.
[5]Yong He Li,Ai Rong Liu,Qi Cai Yu,et al.Random Seismic Response Analysis of Leaning-Type Arch Bridge[J].Advanced Materials Research,2012(378):1509.
[6]宋福春,吴倩娜.横撑对钢管混凝土桁肋提篮拱桥横向弹性稳定的影响[J].沈阳建筑大学学报(自然科学版),2014,30(5):850-855.
[7]CJJ 166—2011,城市桥梁抗震设计规范[S].
[8]GB 18306—2001,中国地震动参数区划图[S].
[2]王军文,李建中,范立础.非规则梁桥横桥向地震碰撞反应分析[J].振动与冲击,2010,29(6):25-30,233.
[3]惠迎新,台玉吉,王克海,等.跨断层桥梁抗震设防启示及建议[J].世界地震工程,2017,33(2):192-198.
[4]张晨,徐勋倩,陈静.中承式钢管混凝土拱桥地震响应分析[J].中外公路,2013,33(2):88-91.
[5]Yong He Li,Ai Rong Liu,Qi Cai Yu,et al.Random Seismic Response Analysis of Leaning-Type Arch Bridge[J].Advanced Materials Research,2012(378):1509.
[6]宋福春,吴倩娜.横撑对钢管混凝土桁肋提篮拱桥横向弹性稳定的影响[J].沈阳建筑大学学报(自然科学版),2014,30(5):850-855.
[7]CJJ 166—2011,城市桥梁抗震设计规范[S].
[8]GB 18306—2001,中国地震动参数区划图[S].