燃气爆炸荷载作用下钢筋混凝土板抗爆性能数值模拟  

Numerical Simulation of Anti-Explosion Performance of Reinforced Concrete Slab under Gas Explosion Load

作　　者：段文峰[1] 何宝蔚 徐宇航 DUAN Wenfeng;HE Baowei;XU Yuhang(School of Civil Engineering,Jilin Jianzhu University,Changchun Jilin 130118,China;School of Civil Engineering,Taizhou Institute of Sci.&Tech.,NJUST.,Taizhou Jiangsu 225300,China)

机构地区：[1]吉林建筑大学土木工程学院,吉林长春130118 [2]南京理工大学泰州科技学院土木工程学院,江苏泰州225300

出　　处：《北方建筑》2024年第3期76-80,共5页Northern Architecture

基　　金：国家自然科学基金(52378487);江苏省大学生创新项目(202313842002Y)。

摘　　要：为了研究不同燃气爆炸荷载下混凝土板的动态响应特点,本文通过已有文献中的钢筋混凝土板抗爆试验,利用LS-DYNA有限元软件建立数值模型并验证其可靠性。然后,在混凝土板面施加不同峰值的简化三角燃气荷载,研究混凝土板在燃气荷载作用下的位移、速度、加速度等。结果表明:试验用钢筋混凝土板的最大位移和振动都出现在板跨中位置,且随着荷载峰值的增大而增大;当荷载峰值超过20 kPa时,随着作用在混凝土板上荷载量值的增加,结构的刚度受到削弱,在受迫振动阶段结构振动加速度的特性会发生变化,出现高频振荡;高频振荡开始时间随着燃气爆炸荷载峰值的提高而提前;当荷载结束后,混凝土板进入自由振动阶段,板的振动周期受残余刚度的影响,随着荷载峰值的提高而增大。In order to study the dynamic response characteristics of concrete slabs under different gas explosion loads,this paper uses LS-DYNA finite element software to establish a numerical model and verify its reliability based on anti-explosion tests of reinforced concrete slabs in existing literatures.Then,a simplified triangular gas load with different peak values is applied to the concrete slab to study the displacement,velocity and acceleration of the slab under the gas load.The results indicate that the maximum displacement and vibration of the reinforced concrete slab used in the experiment occur at the mid-span position,and they increase with the augmentation of the load peak value;when the peak load exceeds 20 kPa,with the increase of the load value acting on the concrete slab,the stiffness of the structure is weakened,and the characteristics of the vibration acceleration of the structure will change in the forced vibration stage,resulting in high-frequency oscillation;the initiation time of high-frequency oscillation advances with the increase of peak value of gas explosion load,after the load ends,the concrete plate enters the stage of free vibration,and the vibration period of the plate is affected by the residual stiffness,increasing with the increase of load peak value.

关 键 词：现浇混凝土板 燃气爆炸 爆炸振动 数值模拟 

分 类 号：TU375.2[建筑科学—结构工程]