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《Journal of Shandong Agricultural University(Natural Science Edition)》 2018-06
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Influence of Reinforcement Ratio and Section Size on the Anti-explosion Performance of RC-beam with Rectangular Section

ZHOU Qing;DING Jie;NIU Ning-ning;LIU Hai-yuan;Urban Planning and Design Institute of Binzhou;  
The finite element model of simply supported concrete beam with the length of 3 m and the section of 200 mm×500 mm is established by LS-DYNA software. Two kinds of TNT explosives, W=10 kg and W=20 kg, are arranged on the top of the middle span beam. The influence of reinforcement ratio on the anti-explosion performance of beams under explosive load action was studied by three analysis methods: beam integral analysis, beam reinforcement stress analysis,concrete failure analysis and plastic deformation analysis. Then, the influence of changing section width and section length on the anti-explosion performance was studied under the condition of W=20 kg dosage and the constant maximum reinforcement ratio, the study found that(1) Compared with the increasing longitudinal reinforcement ratio, increasing the ratio of stirrup reinforcement can improve the beam anti-explosion performance more effectively.(2) Increasing the width of beam is not conductive to improving the beam anti-explosion performance.(3) Increasing the height of the beam section can reduce the deflection of the middle section, shorten the vibration period and increase the overall stiffness of the beam, and improve the anti-explosion performance of the beam effectively.(4) The maximum stress of longitudinal reinforcement at the bottom of the mid-span beam is less than the yield strength of the steel bar(fy=400 MPa) and the stirrup stress at the support exceeds the yield strength of the steel bar.(5) "Increasing stirrup reinforcement ratio + increasing beam section height" is the optimal combination mode to improve the anti-explosion performance of rectangular cross-section beam.
【Fund】: 山东省住房和城乡建设厅科学技术计划项目(2017-K4-007)
【CateGory Index】: TU375.1
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