混凝土材料动态破坏过程的近场动力学模拟  

Pridynamics simulation in dynamic failure process of concrete materials

作　　者：郑立静 宁晓骏[1] 彭一 ZHENG Lijing;NING Xiaojun;PENG Yi(Kunming University of Science and Technology,Kunming 650504,China)

机构地区：[1]昆明理工大学,云南昆明650504

出　　处：《新型建筑材料》2024年第6期20-25,41,共7页New Building Materials

基　　金：国家自然科学基金项目(51068012);云南省交通厅科技项目[2013(c)07]。

摘　　要：采用黏弹性近场动力学方法,根据混凝土单轴强度J准则类比得到近场动力学键伸长率的动态断裂准则。通过对骨料下的填充混凝土板、梁等构件进行模拟,探究了不同的加载速率下,骨料对裂纹形态及裂纹扩展路径的影响。结果表明,加载速率越大,混凝土中填充的骨料断裂度也越大。动态断裂J准则能准确描述混凝土在动态荷载下的破坏形态,该方法为混凝土的损伤防治工程提供了指导依据。Using the viscoelastic peridynamics technique,a dynamic fracture criterion for the elongation of the near-field dynamic bond was obtained by analogy with the uniaxial strength J criterion of concrete.By simulating components such as filled concrete slabs and beams under aggregates,the influence of aggregates on crack morphology and crack propagation pathways under different loading rates was explored.The outcomes revealed that the larger the loading rate,the greater the fracture degree of the aggregates filled in concrete.The dynamic fracture J criterion can effectively delineates concrete's failure modes under dynamic loading conditions,and this method provides guidance for damage prevention and control engineering of concrete.

关 键 词：近场动力学 动态断裂准则 混凝土破坏 动态荷载 三点弯曲 

分 类 号：TU528[建筑科学—建筑技术科学]