Numerical study on explosion-induced fractures of reinforced concrete structure by beam-particle model  

作　　者：LIU Jun ZHAO ChangBing YUN Bin 

机构地区：[1]Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China [2]Key Institute of Engineering Safety and Disaster Prevention, College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China [3]3 Geotechnical Research Institute, Hohai University, Nanjing 210098, China

出　　处：《Science China(Technological Sciences)》2011年第2期412-419,共8页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51044003);the National Basic Research Program of China("973"Project)(Grant No.2007CB714104)

摘　　要：In the field of disaster prevention mitigation and protection engineering,it is important to identify the mechanical behaviors of reinforced concrete(RC)under explosive load by simulation.A three dimensional beam-particle model(BPM),which is suitable to simulate the fracture process of RC under explosive load,has been developed in the frame of discrete element method (DEM).In this model,only the elastic deformations of beams between concrete particles were considered.The matrix displacement method(MDM)was employed to describe the relationship between the deformation and forces of the beam.A fracture criterion expressed by stress was suggested to identify the state of the beam.A BPM for steel bar,which can simulate the deformation of steel bar under high loading rate,was also developed based on the Cowper-Symonds theory.A program has been coded using C++language.Experiments of RC slab under explosive load were carried out using the program.Good agreement was achieved between the experimental and simulated results.It is indicated that the proposed theoretical model can well simulate the fracture characteristics of RC slab under explosive load such as blasting pit formation,cracks extension, spallation formation,etc.

关 键 词：explosive load reinforced concrete slab beam-particle model steel bar high loading rate FRACTURE 

分 类 号：TU375.2[建筑科学—结构工程] O572.2[理学—粒子物理与原子核物理]