Dynamic behaviors of double-column RC bridge under barge impact

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (20) : 158-171.

CHEN Tianli1,WU Hao1,FANG Qin2

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Abstract

During the service life, bridges are potentially subjected to collisions by vessels. To study the dynamic responses and damage patterns of the prototype double-column RC bridge under barge impact, the scaling model test of bridge substructure and numerical simulation were conducted. First, the lateral impact test of 1/5 scaled barge bow and rigid impactor on the double-column RC bridge pier (DCBP) specimens was carried out, and the impact force-time histories, crush depth of barge bow, as well as the dynamic behaviors of DCBP specimens were obtained. In addition, based on the finite element (FE) program LS-DYNA, the numerical simulation of the test was conducted. By comparing the FE analyses results with the experimental data, the applicability of the FE analyses approach, material models and corresponding parameters was validated. Then, the refined and simplified FE models of prototype barge-bridge collision were established, respectively. The reliability of simplified FE models using fiber beam element to characterize the pile was verified, and the impact process during barge-bridge collision, the effects of barge mass, impact velocity and impact angle on the dynamic behaviors of the prototype bridge were discussed. It derives that, under the identical impact energy, the impact velocity has a great influence on the permanent crush depth of barge bow; the impact angle has a great effect on the impact duration and the dynamic behaviors of the bridge, and amplifies the overall collapse risk of the bridge. This work can provide a reference for the impact-resistant evaluation and design of the prototype double-column RC bridge against barge impact.

Key words

barge-bridge collision / double-column RC bridge / dynamic behaviors / numerical simulation / collapse

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CHEN Tianli1,WU Hao1,FANG Qin2. Dynamic behaviors of double-column RC bridge under barge impact[J]. Journal of Vibration and Shock, 2023, 42(20): 158-171

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