摘要
针对大规模爆炸后桥梁结构的毁伤评估问题,以三跨连续钢箱梁为对象,采用计算流体动力学(Computational Fluid Dynamics,CFD)和显式动力学方法,研究了冲击波入射角度与冲击波强度对桥梁结构破坏模式的影响规律,建立了桥梁毁伤程度与冲击波特性之间的映射关系。结果表明:通过CFD数值模拟得到的爆炸荷载可以反映冲击波的绕射和消波效应,可以为桥梁结构的抗爆计算提供可靠的爆炸荷载;桥梁的破坏模式与冲击波入射角有关,而桥梁的毁伤程度与冲击波强度有关;入射角度为0°时,桥梁的迎爆面腹板发生局部屈曲,非迎爆面桥墩发生破坏。
Addressing the issue of damage assessment of bridge structures following large-scale explosions,the study took the three-span continuous steel box girder as object to study the influence of the incidence angle and shock wave intensity on the damage pattern of bridge struc-tures and established the mapping relationship between the degree of bridge damage and shock wave characteristics by computational fluid dynamics(CFD)and explicit dynamic methods.Re-sults showed that the explosion loads obtained by CFD numerical simulations can accurately re-flect the diffraction and wave attenuation effects of shock waves,which provides reliable explo-sion loads for the blast resistance analysis of bridge structures.The destruction mode of the bridge is related to the incidence angle of the shock wave,while the extent of damage is associat-ed with the intensity of the shock wave.At an incidence angle of 0°,the blast-facing web of the bridge occurs localized buckling,and the non-blast-facing piers are damaged.However,at inci-dence angles between 30°and 90°,the bridge undergoes bending failure in the girder.Through analysis,the study identifies the inherent connection between the damage mode and severity of bridge structures and the characteristics of the shock waves.
作者
张磊
余振鹏
于祥敏
杜晓庆
徐旭
ZHANG Lei;YU Zhenpeng;YU Xiangmin;DU Xiaoqing;XU Xu(Department of Civil Engineering,School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444)
出处
《火箭军工程大学学报》
2024年第1期34-45,共12页
Journal of Rocket Force University of Engineering
关键词
钢箱梁桥
远场爆炸
动力响应
毁伤评估
steel box girder bridge
far-field explosion
dynamic response
damage assess-ment
