[1]王世超,张岗,贾宇煊,等.爆炸荷载作用下工字钢-混凝土组合梁损伤机理研究[J].长安大学学报(自然科学版),2025,45(6):42-57.
　WANG Shi-chao,ZHANG Gang,JIA Yu-xuan,et al.Study on damage mechanism of I-beam-concrete composite girders under blast loading[J].Journal of Chang’an University (Natural Science Edition),2025,45(6):42-57.
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爆炸荷载作用下工字钢-混凝土组合梁损伤机理研究()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第45卷
期数:
2025年6期
页码:
42-57
栏目:
桥梁智能运维与防灾减灾
出版日期:
2025-11-30

文章信息/Info

Title:
Study on damage mechanism of I-beam-concrete composite girders under blast loading
文章编号:
1671-8879(2025)06-0042-16
作者:
王世超1; 张岗1; 贾宇煊1; 刘昊厅1; 张永飞1; 倪雅2; 郭彤3
(1. 长安大学 公路学院,陕西 西安 710064; 2. 苏交科集团股份有限公司,江苏 南京 210017; 3. 东南大学 土木工程学院,江苏 南京 211189)
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)
关键词:
桥梁工程;  工字钢-混凝土组合梁;  任意拉格朗日-欧拉方法;  爆炸荷载;  损伤机理;  动态响应
Keywords:
bridge engineering;  I-beam-concrete composite girder;  ALE method;  explosion load;  damage mechanism;  dynamic response
分类号:
U411
文献标志码:
A
摘要:
为明确工字钢-混凝土组合梁在近场爆炸下的空间损伤机理并识别其最不利受爆场景,以40 m双向六车道工字钢组合梁作为研究对象,采用LS-DYNA构建包含钢梁、桥面板及栓钉的精细化有限元模型; 为精确捕捉冲击波传播、反射及绕流等关键现象,采用经试验数据验证的任意拉格朗日-欧拉(ALE)流固耦合算法进行模拟; 基于该算法,开展8种典型工况的参数分析,分析不同比例爆距(0.100～0.171 m/kg1/3)及爆炸源纵、横向位置对结构动态响应与损伤模式的影响; 根据钢梁变形与桥面板破损程度,建立包含4个等级的定性损伤分级体系。研究结果表明:结构损伤演化主要集中在爆炸后的前10 ms内,且损伤程度与比例爆距呈显著负相关; 当比例爆距从0.171 m/kg1/3降至0.100 m/kg1/3时,桥面板破口面积扩大近6倍,跨中峰值挠度增加1.2倍; 爆炸源横向位置对损伤的控制作用远大于纵向位置,后者仅改变响应区域,而前者则彻底改变损伤模式; 当爆炸从桥梁中心线移至边梁正上方时,显著的绕流效应导致能量高度集中,钢梁的上翼缘和腹板吸收了约70%的能量,发生严重剪切屈曲和撕裂,构成结构最不利受爆场景; 建立的基于ALE方法的分析框架可为该类组合梁的抗爆性能评估、薄弱区域识别与防护设计提供关键的数值分析手段与理论依据。
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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备注/Memo

备注/Memo:
收稿日期:2025-05-03
基金项目:国家自然科学基金项目(52408505); 陕西省创新能力支撑计划项目(2023-CX-TD-38); 陕西省杰出青年科学基金项目(2022JC-23); 中央高校基本科研业务专项资金项目(300102214401,300102214903)
作者简介:王世超(1989-),男,内蒙古赤峰人,讲师,工学博士,博士后,E-mail:wangshichao@chd.edu.cn。
更新日期/Last Update: 2025-12-20