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Study on damage mechanism of I-beam-concrete composite girders under blast loading(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年6期
Page:
42-57
Research Field:
桥梁智能运维与防灾减灾
Publishing date:

Info

Title:
Study on damage mechanism of I-beam-concrete composite girders under blast loading
Author(s):
WANG Shi-chao1;  ZHANG Gang1;  JIA Yu-xuan1;  LIU Hao-ting1;  ZHANG Yong-fei1; NI Ya2;  GUO Tong3
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Jiangsu Transportation Institute Group Co., Ltd., Nanjing 210017, Jiangsu, China; 3. School of Civil Engineering, Southeast University,Nanjing 211189, Jiangsu, China)
Keywords:
bridge engineering;  I-beam-concrete composite girder;  ALE method;  explosion load;  damage mechanism;  dynamic response
PACS:
U411
DOI:
-
Abstract:
To clarify the spatial damage mechanism of I-steel-concrete composite girders under near-field explosions and identify their most critical blast scenarios, a 40 m two-way six-lane I-steel-composite girder was studied. A refined finite element model including the steel girder, bridge deck, and shear studs was developed using LS-DYNA. The simulation employed the experimentally validated arbitrary Lagrangian-Eulerian(ALE)fluid-structure interaction algorithm to accurately capture key phenomena such as blast wave propagation, reflection, and flow-around effects. Based on the algorithm, a parametric analysis of eight typical working conditions was conducted to investigate the effects of scaled distance(from 0.100 to 0.171 m/kg1/3)and the longitudinal and transverse positions of the explosion source on structural dynamic response and damage patterns. A qualitative damage classification system consisting of four levels was established according to the deformation of the steel girder and the extent of deck damage. The results show that structural damage evolution primarily occurs within the first 10 ms after detonation, and damage severity exhibits a significant negative correlation with scaled distance. When the scaled distance decreases from 0.171 m/kg1/3 to 0.100 m/kg1/3, the breach area in the bridge deck increases nearly sixfold, and the peak mid-span deflection rises by 1.2 times. The transverse position of the explosion source influences damage far more significantly than the longitudinal position. The latter only alters the response region, while the former fundamentally changes the failure mode. When the explosion moves from the bridge centerline to directly above the edge girder, pronounced flow-around effects lead to highly concentrated energy, causing the upper flange and web of the steel girder to absorb about 70% of the energy, resulting in severe shear buckling and tearing. This constitutes the most critical blast scenario for the structure. The ALE-based analytical framework established in this study provides key numerical tools and a theoretical basis for blast resistance evaluation, vulnerable area identification, and protective design of such composite girders.7 tabs, 26 figs, 36 refs.

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Last Update: 2025-12-20