Impact coefficients analysis for a multi-span elastically supported bridge under random vibration

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (3) : 119-124.

XU Wentao1,2,ZHANG Jianbo2,LIAO Jingbo1,TANG Guangwu1

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Abstract

Based on random vibration theories and orthogonal test design, impact coefficients of a three-span elastically supported bridge and their influence factors were studied. The dynamic random responses of the bridge were solved using the pseudo-excitation method (PEM) under the actions of vehicles and bridge surface roughness. Based on the 3σ standard deviation rule, the random responses of the bridge deflection were converted from statistical results into a deterministic value field. Then the impact coefficients of the bridge were calculated. In order to investigate the influence laws and significance of bridge length, bridge stiffness, bridge surface roughness, vehicle velocity, vehicle weight and vehicle wheelbase on the impact coefficients at different positions of the bridge, an orthogonal test for influence factors on the bridge impact coefficients was designed. The results showed that the new method is accurate and can efficiently overcome the computation difficulties brought by the multi-factors orthogonal test; the differences of the deflection impact at different positions of the bridge are larger, they increase with increase in the level of the bridge surface roughness; the most significant influence factor is bridge surface roughness, followed by bridge length and vehicle velocity.

Key words

elastically supported bridge / impact factor / random vibration / pseudo excitation method / orthogonal test

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XU Wentao1,2,ZHANG Jianbo2,LIAO Jingbo1,TANG Guangwu1. Impact coefficients analysis for a multi-span elastically supported bridge under random vibration[J]. Journal of Vibration and Shock, 2017, 36(3): 119-124

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