近爆荷载作用下的桥梁受力及破坏特征分析  

Analysis of Stress and Damage Characteristics for Concrete Bridge under Close Blast Loading

作　　者：李源[1] 侯炜[1] 贺拴海[1] LI Yuan;HOU Wei;HE Shuan-hai(School of Highway,Chang'an Unversity,Xi'an 710064,China)

机构地区：[1]长安大学公路学院,西安市710064

出　　处：《公路》2020年第9期73-77,共5页Highway

基　　金：长安大学中央高校基本科研业务费专项资金资助项目编号310821161012。

摘　　要：为研究近爆荷载作用下的混凝土桥的受力及破坏特征,采用ALE流固耦合分析理论,基于AUTODYN分析模型,开展不同炸药当量、桥面跨中位置爆炸、支点位置爆炸等近爆荷载作用下的结构应力场及破坏特征的研究。研究结果表明,随着炸药当量的增加,混凝土受载范围内超压峰值显著增大,跨中位置发生爆炸时,结构的破坏形式主要表现为混凝土桥面板的冲剪破坏、炸点附近腹板的弯曲破坏、支座附近的受压破坏。支点处发生爆炸时,支点附近腹板在爆炸冲击荷载作用下出现冲剪破坏,同时桥面板发生局部破损,破坏程度及范围随着炸药当量的提高而显著增加。In order to study the stress and damage characteristics of concrete bridges under close blast loading,in this paper ALE(Arbitrary Lagrange Euler)is used to analyze the pressure field distribution on concrete bridges under blast loading with respect to different TNT equivalent,middle and aside the span blasts.The results show that the overpressure peak will increase significantly with the equivalent weight of TNT.When the explosive happens in the middle of the span,the damage characteristics manifest as the shear failure of bridge deck,bending failure of girder and compression failure of concrete near supports.When it happens above the support,there is a remarkable shear failure of web plate,and there is local damage in bridge deck.The degree and scale of structure lays on the explosive equivalent.

关 键 词：混凝土桥梁 数值仿真 近场爆炸荷载 流固耦合 分析 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]