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《Journal of Vibration and Shock》 2015-04
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Tests for dynamic behaviors of deep RC beams under impact loadings

XU Bin;ZENG Xiang;College of Civil Engineering,Hunan University;The Key Laboratory of Building Safety and Energy Efficiency of Ministry of Education,Hunan University;College of Civil Engineering and Architecture,Hainan University;  
In order to understand the dynamic behaviors of deep reinforced concrete( RC) beams under impact loadings,falling-weight impact tests for two groups of simply-supported deep RC beams with different static behaviors were conducted and the effects of impact velocity and the second impact on the impact-resistant behavior of deep RC beams were investigated. By analyzing crack initiation,propagation and failure process of specimens recorded using a high-speed video camera and comparing crack patterns of specimens under different loadings,it was found that crack initiation,propagation,failure process and crack patterns are affected obviously by impact velocity,and the major crack development under the second impact mainly follows the crack path induced by the first impact loading. The characteristics of time histories of impact force and mid-span displacement and the impact force versus mid-span displacement curves were analyzed in details,it was shown that the maximum impact force,the maximum mid-span deflection,and the residual mid-span deflection change approximately linearly with impact velocity for specimens without serious shear failure;moreover,the specimens with better ductility have better impact-resistant behaviors. Finally,by analyzing the time histories of impact force,support reaction force and inertia force,it was concluded that taking the maximum impact force or the maximum support reaction force as the impact-resistant loading capacity is incorrect.
【Fund】: 国家自然科学基金重大研究计划重点项目(90715033);培育项目(91015007)
【CateGory Index】: TU375.1
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【Citations】
Chinese Journal Full-text Database 3 Hits
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1 LIN Gao(School of Civil and Hydraulic Engineering,Dalian University of Technology,Dalian 116024,China);Developing Tendency of the Seismic Safety Evaluation of Large Concrete Dams[J];Journal of Disaster Prevention and Mitigation Engineering;2006-01
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