液化场地桩基桥梁震害响应大型振动台模型试验研究
摘要
采用大型振动台进行液化场地桩基桥梁震害响应模型试验,很好再现了自然地震触发场地液化及结构破坏的各种宏观现象。0.15gEl Centro波输入下,上部砂层局部液化,桩-柱墩加速度主要表现为低频反应,桩动应变幅值自下而上很快增大、到达地表则大幅度减小。0.5gEl Centro波输入下,整个砂层全部液化,桩被折断且加速度也主要表现为低频反应,桩动应变幅值自下而上很快增大、到达地表则大幅度减小。砂层液化与否,对桩-柱墩动力反应影响很大。
The proportional model test of seismic response of bridge of pile foundation in liquefaction ground is done by a large-scale shaking table,which can commendably recurrence the main phenomenon of ground liquefaction and structure breakage arisen from natural earthquake.In input of 0.15gEl Centro wave,the upside of the saturation sand stratum is partly liquefied;the low-frequency response of acceleration appears on pile and pillar frusta;and the peak value of pile dynamical strain fastly aggrandizes from bottom to top;and moreover,largely minishes up to toft surface.In input of 0.5gEl Centro wave,the saturation sand stratum is entirely liquefied;the low-frequency response of acceleration also appears on pile and pile is broken;and the peak value of pile dynamical strain fastly aggrandizes from bottom to top,and moreover,largely minishes up to toft surface.It has importantly influence upon dynamic response of pile and pillar frusta that the saturation sand stratum is liquefied or not.
The proportional model test of seismic response of bridge of pile foundation in liquefaction ground is done by a large-scale shaking table,which can commendably recurrence the main phenomenon of ground liquefaction and structure breakage arisen from natural earthquake.In input of 0.15gEl Centro wave,the upside of the saturation sand stratum is partly liquefied;the low-frequency response of acceleration appears on pile and pillar frusta;and the peak value of pile dynamical strain fastly aggrandizes from bottom to top;and moreover,largely minishes up to toft surface.In input of 0.5gEl Centro wave,the saturation sand stratum is entirely liquefied;the low-frequency response of acceleration also appears on pile and pile is broken;and the peak value of pile dynamical strain fastly aggrandizes from bottom to top,and moreover,largely minishes up to toft surface.It has importantly influence upon dynamic response of pile and pillar frusta that the saturation sand stratum is liquefied or not.
引文
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[6]Kagawa T,Minowa C,Mizuno H,Abe A.Shaking-Table tests on piles in liquefying sand[A].Proc 5th U S Natl Conf Earthquake Engineering[C].Chicago:[s.n.],1994,107-116.
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[10]凌贤长,王臣,王成.液化场地桩—土—桥梁结构动力相互作用振动台试验模型相似设计方法[J].岩石力学与工程学报,2004,23(3):450-456.LING Xian-zhang,WANG Chen,WANG Cheng.Scale modeling method of shaking table test of dynamic interaction of soil-pile-bridge structure in ground of soil liquefaction[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(3):450-456.
[2]Mizuno H,Iiba M,Hirade T.Pile Damage During the 1995 Hyogoken-Nanbu Earthquake in Japan[A].Proceedings of 11th World Conference on Earthquake Engineering[C].Acapulco:[s.n.],1996.977.
[3]Kagawa T,Minowa C,Abe A.Earthquake damage to underground structures[A].Proceedings of 12th World Conference on Earthquake Engineering[C].New Zealand:[s.n.]2000.
[4]凌贤长,王东升,王志强,等.液化场地桩—土—桥梁结构动力相互作用大型振动台模型试验研究[J].土木工程学报,2004,37(11):67-72.LING Xian-zhang,WANG Dong-sheng,WANG Zi-qiang,et al.Large-scale shaking table model test of dynamic soil-pile-bridge structure interaction in ground of liquefaction[J].China Civil Engineering Journal,2004,37(11):67-72.
[5]凌贤长,王东升.液化场地桩-土-桥梁结构动力相互作用振动台试验研究进展[J].地震工程与工程振动,2002,22(4):53-59.LING Xian-zhang,WANG Dong-sheng.Study on shaking table test for seismic interaction of soil-pile-bridge structure in case of soil liquefaction caused by earthquake[J].Earthquake Engineering and Engineering Vibration,2002,22(4):53-59.
[6]Kagawa T,Minowa C,Mizuno H,Abe A.Shaking-Table tests on piles in liquefying sand[A].Proc 5th U S Natl Conf Earthquake Engineering[C].Chicago:[s.n.],1994,107-116.
[7]Funahara H,Fujii S,Tamura S.Numerical simulation of pile failure in liquefied soil observed in large-scale shaking table test[A].Proc 12th World Conf Earthquake Engineering[C].New Zealand:[s.n.],2000.927.
[8]Yasuda S,Ishihara K,Morimoto I,et al.Large-scale shaking table tests on pile foundations in liquefied ground[A].Proceedings of 12th World Conference on Earthquake Engineering[C].New Zealand:[s.n.],2000.1 474.
[9]Tamura S,Suzuki Y,Tsuchiya T,et al.Dynamic response and failure mechanisms of a pile foundation during soil liquefaction by shaking table test with a large-scale laminar shear box[A].Proceedings of 12th World Conference on Earthquake Engineering[C],New Zealand:[s.n.],2000.903.
[10]凌贤长,王臣,王成.液化场地桩—土—桥梁结构动力相互作用振动台试验模型相似设计方法[J].岩石力学与工程学报,2004,23(3):450-456.LING Xian-zhang,WANG Chen,WANG Cheng.Scale modeling method of shaking table test of dynamic interaction of soil-pile-bridge structure in ground of soil liquefaction[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(3):450-456.
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