纵向地震作用下大跨斜拉桥主引桥碰撞效应研究
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摘要
地震作用下大跨斜拉桥梁端会发生很大位移,过大位移可能会导致主梁与引桥发生碰撞。针对地震作用下大跨斜拉桥伸缩缝处的碰撞现象,以一座大跨斜拉桥工程设计为例,采用非线性时程法研究了纵向地震作用下大跨斜拉桥主引桥碰撞效应对结构地震反应的影响规律。研究结果表明:碰撞效应不仅会产生很大的撞击力,而且可能使引桥地震力需求、引桥梁端位移、主引桥相对位移及引桥梁体搭接长度需求有较大增长,极易造成引桥的落梁或者破坏;但碰撞效应对主桥的地震需求影响较小。
For a long span cable-stayed bridge,the seismic displacement at the end of the deck may severely exceed the allowance which due to the occurrence of the pound between the main span and the approach span usually which can causes the collision of falling-beams and structures under strong earthquakes.In this paper,based on the pounding phenomenon at expansion joints of long span cable-stayed bridge under strong earthquake and employing a long span cable-stayed bridge,with the time history ana-lysis method,the pounding effects of adjacent girders at expansion joints on seismic responses of long-span cable-stayed bridge are studied.The results indicate that the pounding can amplify the seismic demand of piers of the approach span and also can amplify the displacement of beam of the approach span,the relative displacement between main span and approach span and the hinge seat width of beam of approach span obviously and it causes easily the collision of falling-beams and structures under strong earthquakes.But the pounding has minor effects on seismic demand of the main span.
For a long span cable-stayed bridge,the seismic displacement at the end of the deck may severely exceed the allowance which due to the occurrence of the pound between the main span and the approach span usually which can causes the collision of falling-beams and structures under strong earthquakes.In this paper,based on the pounding phenomenon at expansion joints of long span cable-stayed bridge under strong earthquake and employing a long span cable-stayed bridge,with the time history ana-lysis method,the pounding effects of adjacent girders at expansion joints on seismic responses of long-span cable-stayed bridge are studied.The results indicate that the pounding can amplify the seismic demand of piers of the approach span and also can amplify the displacement of beam of the approach span,the relative displacement between main span and approach span and the hinge seat width of beam of approach span obviously and it causes easily the collision of falling-beams and structures under strong earthquakes.But the pounding has minor effects on seismic demand of the main span.
引文
[1]Nawawi Chouw,Hong Hao.Study of SSI and non-u-niform ground motion effect on pounding betweenbridge girders[J].Soil Dynamics and Earthquake En-gineering,2005,25:717–728.
[2]Robert Jankowski,Krzysztof Wilde,Yozo Fujino.Re-duction of pounding effects in elevated bridges duringearthquakes[J].Earthquake Engineering and Struc-tural Dynamics,2000,29:195-212.
[3]Anat Ruangrassamee,Kazuhiko Kawashima.Relativedisplacement response spectra with pounding effect[J].Earthquake Engineering and Structural Dynam-ics,2001,30:1511-1538.
[4]王军文,李建中,范立础.非规则梁桥伸缩缝处的碰撞对地震反应的影响[J].土木工程学报,2006,30(1):54-59.
[5]邓育林,彭天波,李建中.大跨多塔悬索桥纵向地震碰撞反应参数研究[J].振动与冲击,2011,30(4):152-157.
[6]王东升,冯启民,王国新.基于直杆共轴碰撞理论的桥梁地震反应邻梁碰撞分析模型[J].工程力学,2009,(4):110-114.
[2]Robert Jankowski,Krzysztof Wilde,Yozo Fujino.Re-duction of pounding effects in elevated bridges duringearthquakes[J].Earthquake Engineering and Struc-tural Dynamics,2000,29:195-212.
[3]Anat Ruangrassamee,Kazuhiko Kawashima.Relativedisplacement response spectra with pounding effect[J].Earthquake Engineering and Structural Dynam-ics,2001,30:1511-1538.
[4]王军文,李建中,范立础.非规则梁桥伸缩缝处的碰撞对地震反应的影响[J].土木工程学报,2006,30(1):54-59.
[5]邓育林,彭天波,李建中.大跨多塔悬索桥纵向地震碰撞反应参数研究[J].振动与冲击,2011,30(4):152-157.
[6]王东升,冯启民,王国新.基于直杆共轴碰撞理论的桥梁地震反应邻梁碰撞分析模型[J].工程力学,2009,(4):110-114.
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