基于黏弹性近场动力学方法的素混凝土板冲击破坏形态分析  

Impact failure mode analysis of plain concrete slabs based on viscoelastic near-field dynamics method

作　　者：侯庆 宁晓骏[1] 刘国坤[1] 华涛 彭一 李松波 HOU Qing;NING Xiaojun;LIU Guokun;HUA Tao;PENG Yi;LI Songbo(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming Yunnan 650500,China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650500

出　　处：《工业安全与环保》2024年第7期6-13,共8页Industrial Safety and Environmental Protection

基　　金：云南省教育厅项目(22B0737)。

摘　　要：通过拉格朗日方程推导出一种基于单键双参数键型近场动力学的黏弹性模型,对冲击荷载下的素混凝土板的破坏过程进行模拟,采用单轴动态强度S准则得出物质点对间键的动态断裂准则。分别将低速落锤撞击下的素混凝土板的仿真结果与连续-不连续介质力学方法(CDEM)的模拟结果,高速子弹射击下的素混凝土板的仿真结果与试验结果进行对比。结果表明,黏弹性单键双参数近场动力学模型能合理地描述混凝土在冲击荷载下的破坏形态,且该模型能针对不同加载速率做出不同的反应,为冲击作用下的混凝土防护与混凝土的结构改造提供了一种有效的方法。A viscoelastic model incorporating single-bond and dual-parameter bond peridynamics was derived from the Lagrange equation to simulate the failure process of plain concrete slabs under impact load.The dynamic fracture criterion for point bonds was obtained using the uniaxial dynamic strength S criterion.This numerical simulation compares the simulation results of the plain concrete slab under low-speed drop hammer impact with the simulation results of the continuum-discontinuum element method(CDEM).The simulation results of the plain concrete slab under high-speed bullet shooting are compared with the experimental results.The results show that the viscoelastic singlebond dual-parameter peridynamics model can reasonably describe the failure mode of concrete under impact load,and this model can respond differently to different loading rates,providing an effective method for concrete protection and structural modification under impact.

关 键 词：黏弹性近场动力学 动态断裂准则 素混凝土板破坏 裂纹扩展 数值模拟 

分 类 号：TU37[建筑科学—结构工程]