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论文类型：期刊论文

发表时间：2015-02-01

发表刊物：COMPUTERS AND CONCRETE

收录刊物：SCIE、EI、Scopus

卷号：15

期号：2

页面范围：305-319

ISSN号：1598-8198

关键字：mesoscale simulation; Rigid Body Spring Model (RBSM); reinforced concrete (RC) member; crack distribution; deflection

摘要：On mesoscopic level, concrete can be treated as a three-phase composite material consisting of mortar, aggregates and interfacial transition zone (ITZ) between mortar and aggregate. A lot of research has confirmed that ITZ plays a crucial role in the mechanical fracture process of concrete. The aim of the present study is to propose a numerical method on mesoscale to analyze the failure mechanism of reinforced concrete (RC) structures under mechanical loading, and then it will help precisely predict the damage or the cracking initiation and propagation of concrete. Concrete is meshed by means of the Rigid Body Spring Model (RBSM) concept, while the reinforcing steel bars are modeled as beam-type elements. Two kinds of RC members, i.e. subjected to uniaxial tension and beams under bending, the fracture process of concrete and the distribution of cracks, as well as the load-deflection relationships are investigated and compared with the available test results. It is found that the numerical results are in good agreement with the experimental observations, indicating that the model can successfully simulate the failure process of the RC members.