Study on Dynamic Behavior of AFRP-Wrapped Circular Concrete Specimens under Repeated Impacts

Abstract

A series of damage tests and axially repeated compressive tests with high strain rates were conducted to investigate the behavior of aramid fiber reinforced polymer (AFRP) wrapped concrete under repeated impacts. The relation between damage condition and variables such as impact number and polymer thickness were examined. The tests were performed using a 100 mm diameter Split Hopkinson Pressure Bar (SHPB) apparatus and a nonmetal supersonic test meter. Various AFRP layers were applied to produce varied confinement ratios. The experimental results indicated that the AFRP-wrapped concrete exhibited excellent performance in resisting repeated impacts. Also, the specimens maintained their shapes and bearing capacity after multiple impacts with a mean strain rate of 50 s−1. No distinct decline was observed from the history of peak stress and impact toughness in AFRP-wrapped concrete. Moreover, additional AFRP layers significantly decreased the impact damage on the core concrete, as reflected by the different strain rate histories in damage progression.

Dynamic Splitting Tensile Behaviour of Concrete Confined by Natural Flax and Glass FRP

“…In terms of the dynamic properties, many studies focused on the compressive behaviour of FRP-confined concrete, mainly focusing on carbon [ 32 , 33 , 34 , 35 ], glass [ 36 , 37 , 38 , 39 ] and aramid fibres [ 40 , 41 , 42 , 43 ]. Uddin et al [ 32 ] compared the energy absorption of two different confinement materials, prefabricated polypropylene jacket and CFRP, to strengthen concrete cylinders.…”

“…Huang et al [ 35 , 37 , 44 ] carried out a series of experimental tests to explore the dynamic behaviour of normal concrete or ultra-high-performance concrete confined by different FRP jackets, such as glass and carbon fabrics. Song et al [ 42 ] studied the behaviour of aramid-FRP-wrapped concrete under repeated impacts. Under multiple impacts with a mean strain rate of 50 s −1 , the specimens maintained their integrity, showing good impact resistance.…”