Nonlinear responses and damage characteristics for group-piles foundation of a deep-water Bridge under strong near-field and far-field earthquakes

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (24) : 13-22.

JIANG Hui1, WANG Zhi2, BAI Xiao-yu1, ZENG Cong1

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Abstract

Taking the group-piles foundation of a large deep-water bridge as a study object, its nonlinear calculation model considering hydrodynamic effect and pile-soil interaction was built. The strong near-field and far-field earthquake records were taken as inputs, the dynamic response and damage characteristics of the foundation under different water depths were analyzed. The results showed that the dynamic responses of the foundation under near-field earthquakes are larger than those under far-field earthquakes; the maximum increments of shear force, moment, and displacement appear at different depths beneath the erosion line, while those of axial force appear at the pile top, the maximum increments of moment, shear force, displacement and axial force are 150.6%, 227.2%, 333.4% and 64.2%, respectively; under near-field earthquakes, the pier bottom and pile top are main vulnerable positions, the damage indexes of the pile top are 0.19 and 0.40, respectively under peak ground accelerations (PGAs) of 0.38g and 0.6g; the damage level and range increase with increase in earthquake intensity, and increase slightly with increase in water depth; under far-field earthquakes, the group-piles foundation is mainly in elastic state, due to the constraint effect of soil around piles, structural damage may occur at some junctions of soil layers with a certain depth, the damage level increases with increase in earthquake intensity and spreads to both ends. Comparisons showed that the dynamic responses and structural damage of the foundation under near-field earthquakes are significantly greater than those under far-field earthquakes; the impulse type near-field earthquakes have higher deformation and energy-dissipation demands, more attentions should be paid to the aseismic design of deep-water bridges, especially, the ductility design of their foundations.

Key words

group-piles foundation of a deep-water bridge / nonlinear model / hydrodynamic effect / pile-soil interaction / dynamic time history analysis / seismic damage characteristic / near-field and far-field earthquake

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JIANG Hui1, WANG Zhi2, BAI Xiao-yu1, ZENG Cong1. Nonlinear responses and damage characteristics for group-piles foundation of a deep-water Bridge under strong near-field and far-field earthquakes[J]. Journal of Vibration and Shock, 2017, 36(24): 13-22

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