Shaking table tests and numerical analysis for pounding effect between main span and approach span of long-span suspension bridges

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (7) : 234-240.

YAN Jukao1,2,LI Jianzhong2,PENG Tianbo2,WANG Junwen3

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Abstract

In order to study pounding effect between main span and approach span of long-span multi-tower suspension bridges,a model for 1/40 scale of Taizhou Changjiang Highway Bridge was designed,constructed and tested on a shaking table.No connections were installed between the main beam and the middle tower in the longitudinal direction.Two fixed bearings and four polysaccharide rubber sliding bearings were installed between each approach beam and piers.The initial gap distance is 3 mm at the expansion joint.Pounding responses between the main span and the approach span were tested under three earthquake waves.The shaking table tests indicated that displacements of the approach and internnal forces acting on fixed piers of the approach span decrease due to the pounding effects between the main span and the approach one when the main span and the approach one are close to each other; however,displacements of the approach span and internal forces acting on fixed piers of the approach span increase due to the pounding effects when the approach span is chased by the main span.The numerical analysis results showed that the test results can be simulated better when adopting Kelvin element combined with SAP2000 commercial software and the contact stiffness is taken as 0.2 times of the axial stiffness of the approach span.The selection of contact stiffness provided a reference for similar bridges’pounding effect simulation.

Key words

long-span suspension bridge

/ shaking table test / pounding effect / traveling wave effect / contact stiffnes

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YAN Jukao1,2,LI Jianzhong2,PENG Tianbo2,WANG Junwen3. Shaking table tests and numerical analysis for pounding effect between main span and approach span of long-span suspension bridges[J]. Journal of Vibration and Shock, 2017, 36(7): 234-240

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