爆炸荷载下桥墩挂板防护性能研究  

Anti-blast Performance of Cladding on Bridge Pier under Explosive Loading

作　　者：周宏元 张雪健 王小娟 周后湛 ZHOU Hong-yuan;ZHANG Xue-jian;WANG Xiao-juan;ZHOU Hou-zhan(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;State Key Laboratory of Explosion Science and Technology,Beijing University of Technology,Beijing 100081,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《爆破》2021年第2期175-183,共9页Blasting

基　　金：国家自然科学基金项目(51808017、51778028);北京理工大学爆炸科学与技术国家重点实验室开放课题(KFJJ20-02M);北京市教委科技计划一般项目(KM201810005019)。

摘　　要：为研究挂板对桥墩在爆炸荷载作用下的防护性能,利用ANSYS/LS-DYNA建立钢筋混凝土板爆炸数值模型并验证其有效性,对有无挂板防护空心截面桥墩数值模型在爆炸下的响应与破坏进行分析比较,通过观察应力波的传播过程、桥墩的破坏形态以及背爆面位移,进一步讨论挂板面板厚度、芯层密度及芯层厚度等关键参数对挂板爆炸防护效果的影响。研究表明:安装挂板可显著减轻桥墩在爆炸荷载下的损伤;当挂板面板厚度从1 cm增加到3 cm、芯层厚度从10 cm增加到30 cm,桥墩背爆面位移显著降低;在一定范围内,挂板防护性能随芯层密度的增大而提高,对轻质挂板应用于桥墩爆炸防护具有一定指导意义。In order to study the protection performance of the cladding on a bridge pier under explosion loading,a numerical model of reinforced concrete slab under explosion was established with ANSYS/LS-DYNA and its validity was verified.Using this numerical model,the response and failure modes of a hollow rectangular section pier with and without cladding under explosion loading were analyzed and compared.The propagation process of stress wave,the failure mode of pier and the displacement of the pier surface opposite to explosion were observed.Meanwhile,the influence of the thickness of the cladding,the density and thickness of the core layer on the protective effect to the pier under explosion were further discussed.The results show that the damage degree of the pier under explosion can be significantly reduced by the attached cladding.When the thickness of the cladding increased from 1 cm to 3 cm and the thickness of the core layer increased from 10 cm to 30 cm,the displacement of the pier surface opposite to explosion decreased obviously.Within certain limits,the protection effectiveness increased with core density.This study can facilitate the application of lightweight cladding on pier protection against explosion.

关 键 词：挂板 桥墩 爆炸荷载 抗爆性能 

分 类 号：O383[理学—流体力学]