近场爆炸作用下涂覆聚脲混凝土自锚式悬索桥数值模拟研究  

Numerical simulation study of self-anchored suspension bridge coated with polyurea concrete under the effect of near-field explosion

作　　者：周广盼[1] 陈毅鹏 王荣[2] 丁建国[2] 董建军 ZHOU Guangpan;CHEN Yipeng;WANG Rong;DING Jianguo;DONG Jianjun(School of Safety Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;School of Physics,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学安全科学与工程学院,南京210094 [2]南京理工大学物理学院,南京210094

出　　处：《振动与冲击》2025年第8期276-286,共11页Journal of Vibration and Shock

基　　金：江苏省自然科学基金(BK20200494);南京理工大学安全科学与工程学院青年人才助推计划;中国博士后科学基金(2021M701725);江苏省博士后科研资助计划项目(2021K522C)。

摘　　要：为研究近场爆炸作用下涂覆聚脲对超宽混凝土自锚式悬索桥最薄弱位置的防护效果,以某超宽混凝土自锚式悬索桥为背景,通过数值模拟方法研究了爆炸作用下自锚式悬索桥破坏特征和动力响应。采用SOLIDWORKS及HYPERMESH软件建立整桥有限元模型,并通过LS-DYNA软件对不同TNT当量、横桥向及纵桥向爆炸位置、不同聚脲厚度进行参数影响分析,对比了爆炸作用下涂覆聚脲前后整桥破坏特征和底板竖向位移。结果表明:聚脲涂层能够有效提高混凝土自锚式悬索桥的抗爆性能;针对横纵桥向不同爆炸位置,最薄弱位置分别为中间箱室和1/2跨中;针对不同聚脲厚度,横纵桥向最薄弱位置最优聚脲厚度分别为8 mm和15 mm。研究成果可为超宽混凝土自锚式悬索桥的战时加固防护提供重要依据。To study the protective effect of polyurea coating on the weakest position of the super-wide concrete self-anchored suspension bridge under the near-field blast loading,a real super-wide concrete self-anchored suspension bridge was selected as the background,and the numerical simulation was used to analyze the damage characteristics and dynamic response of the bridge under the blast loading.The finite element model of the whole bridge was established by using SOLIDWORKS and HYPERMESH,and the dynamic response of the bridge under different explosive equivalents and different lateral and longitudinal blast positions and different polyurea thicknesses was analyzed parametrically by LS-DYNA,and the damage characteristics of the whole bridge and the vertical displacement of the bottom plate before and after the coating of polyurea under the blast loading were compared.The results show that polyurea coating can effectively improve the blast resistance of concrete self-anchored suspension bridges.For different explosion positions in the lateral and longitudinal directions,the weakest positions are the middle box girder and 1/2 span,and the optimal polyurea thicknesses for the weakest positions are 8 mm and 15 mm,respectively.The research results can provide important references for the wartime reinforcement and protection of super-wide concrete self-anchored suspension bridges.

关 键 词：爆炸荷载 自锚式悬索桥 局部涂覆聚脲 有限元分析 动力响应 

分 类 号：U447[建筑科学—桥梁与隧道工程]