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Title |
Impact Resistance of UHPC Exterior Panels under High Velocity Impact Load
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Authors |
강현구(Thomas H.-K. Kang) ; 김상희(Sang-Hee Kim) ; 김민수(Min-Soo Kim) ; 홍성걸(Sung-Gul Hong) |
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DOI |
http://dx.doi.org/10.4334/JKCI.2016.28.4.455 |
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Keywords |
exterior ; UHPC ; high velocity impact load ; rear strain history ; shear plug |
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Abstract |
This experimental study aims to evaluate the impact performance of UHPC exterior panels through high velocity impact tests. The impact performance of UHPC was compared with that of granite in terms of panel thickness, and strain histories were recoded on the rear face of panel specimens. The UHPC turned out to be a good exterior facade material, because the appearance of UHPC is natural enough and impact performance was superior to granite. After colliding, compression pulse reached to the rear face but that pulse was reflected in tension pulse with respect to the free point outside the rear face of the panel. This tension pulse caused the scabbing from the rear side, as the strain histories on the rear face showed three different regions as compression region, steady region and tension region. The shear plug deformation by shear force also was one of the primary reasons for the scabbing based on the observation. Therefore, the scabbing seemed to be affected by both tension and shear forces.
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