Impact coefficient detecting method for a simply supported girder bridge considering degradation of deck unevenness

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (1) : 206-214.

LIU Chenguang, WANG Zonglin, GAO Qingfei

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Abstract

Aiming at the effect mechanism of bridge deck unevenness on bridge impact coefficient, the relationship between the unevenness rank and the impact coefficient and the detecting method of the impact coefficient, based on the vehicle-bridge coupled vibration theory, a numerical analysis simulation program was developed, and effect modes of both spatial and frequency domains features of the deck unevenness on the impact coefficient were numerically studied.Based on the probability distribution model of the impact coefficient, a new indicator called the feature impact coefficient was introduced to represent the increase magnitude of the impact coefficient under different unevenness ranks with different guaranteeing rates.Finally, based on the testing method of obstacle sports cars, sizes and layout modes of obstacles to simulate different deck degradation degrees were obtained, and a new detecting method to pre-judge if the bridge impact coefficient meeting the requirements after the degradation of bridge deck was proposed to conduct a certain exploration in bridge dynamic detection.

Key words

bridge dynamic detection / impact coefficient / bridge deck roughness / simple supported girder bridge

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LIU Chenguang, WANG Zonglin, GAO Qingfei. Impact coefficient detecting method for a simply supported girder bridge considering degradation of deck unevenness[J]. Journal of Vibration and Shock, 2019, 38(1): 206-214

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