基于ALE-FEM-SPH算法的混凝土板在爆炸荷载下响应分析  

Response analysis of concrete slab under blast load based on ALE-FEM-SPH algorithm

作　　者：李子玉 丁建国[2] 周广盼[1] Li Ziyu;Ding Jianguo;Zhou Guangpan(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,江苏南京210094 [2]南京理工大学物理学院,江苏南京210094

出　　处：《南京理工大学学报》2024年第6期773-780,共8页Journal of Nanjing University of Science and Technology

基　　金：江苏省自然科学基金(BK20200494);中国博士后科学基金(2021M701725)。

摘　　要：为了研究爆炸荷载作用下混凝土板的动态响应过程,分析了不同参数对混凝土板破坏特征和动态响应的影响规律。该文采用LS-DYNA软件结合任意拉格朗日-欧拉与有限元模型-光滑粒子流体动力学(ALE-FEM-SPH)算法建立流固耦合有限元模型,基于拉压、最大主应变共同影响提出了混凝土单元失效准则修正方法,通过数值模拟分析了不同爆炸比例距离、混凝土强度、钢筋强度、配筋率对混凝土板破坏特征和动态响应的影响规律,得到了考虑多因素影响的板跨中位移峰值预测模型。结果表明:随着比例距离由0.538 m/kg^(1/3)减小至0.315 m/kg^(1/3,)板跨中位移峰值增加了177.98%,板破坏程度加剧;根据正交试验极差分析结果,比例距离、钢筋配筋率、混凝土抗压强度及钢筋强度极差值分别为0.31、0.11、0.07及0.04,因此对板跨中位移峰值影响最重要的因素为比例距离。In order to study the dynamic response process of concrete slab under blast load,the influence of different parameters on the failure characteristics and dynamic response of concrete slab is analyzed.In this paper,a finite element model of fluid-structure interaction is established by using LS-DYNA software combined with arbitrary Lagranginan Eulerian-finite element model-smoothed particle hydrodynamics(ALE-FEM-SPH)algorithm.Based on the combined influence of tensile compression and maximum principal strain,a correction method for the failure criterion of concrete elements is proposed,and the influence of different explosion proportional distances,concrete strength,reinforcement strength and reinforcement ratio on the failure characteristics and dynamic response of concrete slabs is analyzed through numerical simulation.A prediction model of the peak displacement in the plate span considering the influence of multiple factors is obtained.The results show that as the proportional distance decreases from 0.538 m/kg^(1/3)to 0.315 m/kg^(1/3),the peak displacement in the middle span of the plate increases by 177.98%,and the failure degree of the plate is aggravated.According to the results of the orthogonal test range analysis,the proportional distance,reinforcement ratio,concrete compressive strength and reinforcement strength range are 0.31,0.11,0.07 and 0.04,respectively,so the most important factor affecting the peak displacement in the slab span is the proportional distance.

关 键 词：任意拉格朗日-欧拉 有限元模型 光滑粒子流体动力学 失效准则 混凝土板 爆炸荷载 位移峰值 预测模型 

分 类 号：O383[理学—流体力学]