Anti-collapsing Performance of POZD Coated Reinforced Concrete Slab

doi:10.3969/j.issn.1000-1093.2021.01.015

Abstract

Abstract: Different TNT equivalent tests of three test models were made to study the anti-collapsing behavior of POZD coated reinforced concrete slab. The failure mode and anti-collapsing mechanism of POZD coating were studied and analyzed by observing the damage states and data statistics of the test models. The results show that POZD coated reinforced concrete slab has superior anti-collapsing performance, and with the increase in coating thickness, the anti-collapsing capacity increases gradually, and K_z decreases linearly. After spraying 8 mm-thick POZD coating on reinforced concrete slab, its anti-collapsing capacity is much better than that of 3 mm-thick Q235b steel plate. The damage model of POZD coating is conically bulged under the contact explosion of group charge, which is caused by large plastic deformation under the combined action of concrete fragment and shock wave. When the shock wave load exceeds the ultimate tensile strength of POZD material, the coating can remain intact and effectively restrain the concrete fragments except for the small circular hole shear failure at the tip of the cone. Under the action of high strain and strong dynamic load, POZD coating can still maintain the characteristics of large deformation and high plasticity. Through the large deformation of POZD coating, it absorbs the energy of shock wave, constrains the concrete debris, and plays a good anti-collapsing effect.

Key words: reinforcedconcreteslab, POZDcoatingmaterial, anti-collapsing, explosionload, damagemodel

CLC Number:

O383

YANG Jianchao， WANG Jianhui， CHEN Li， KONG Defeng， ZHAO Hongxiang. Anti-collapsing Performance of POZD Coated Reinforced Concrete Slab[J]. Acta Armamentarii, 2021, 42(1): 133-140.

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