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《Journal of Earthquake Engineering and Engineering Vibration》 2013-03
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Determination of breaking strength of concrete under impact load and CT experiment verification

LEI Guangyu1,DANG Faning1,CHEN Houqun1,2(1.Institute of Geotechnical Engineering,Xi’an University of Technology,Xi’an 710048,China;2.China Institute of Water Resources and Hydropower Research,Beijing 100048,China)  
Concrete was taken as three-phase composites consisting of aggregate,bond and mortar on micro-level.We established the random aggregating model and applied the concrete damage plasticity model.By applying different loading we carried out the numerical simulation of the specimen under impact load.Eventually,the peak intensity obtained from the load-displacement was regarded as the destruction strength of the micro-concrete specimens.We researched the material damage process and gained the CT image of each stress stage by the scanning of the specimen under impact loading.We found the failure process and the destruction strength of the numerical simulation is similar to the CT test.The results show that the method is convenient to simulate the damage and fracture of concrete under impact loading.Taking the peak intensity of the load-displacement curve as the destruction strength is reasonable.
【Fund】: 国家自然科学基金项目(50879069);; 水利部公益性行业科研专项(1261230100012);; 西安理工大学博士基金项目(106-211107)
【CateGory Index】: TU528
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