Static and Dynamic Behavior of High-strength Lightweight Reinforced Concrete One-way Ribbed Slabs

Abstract

Nowadays, reducing the self-weight of structures and vibration problems is the primary goal for design requirements in most civil constructions. Two-point loading and harmonic loading tests were conducted to examine the strength and serviceability of high-strength reinforced concrete one-way ribbed slabs. Six slabs were cast and tested. The behavior of cracking, deflection, and vibration was investigated. The experimental results showed that using high strength-lightweight concrete (HSLWC) instead of high strength-normal weight concrete (HSNWC) in constructed one-way ribbed slab led to a decrease in the density by 19.31%, the strength by 17.70%, and ultimate deflection by 17.33%. Although the addition of steel fibers to HSLWC led to an increase in the density of concrete its addition enhances the load-deflection relationship and ultimate load for slab specimen which reduced the reduction in strength by 14.49%. Furthermore, ductility index, stiffness, and toughness index for ribbed slab specimens with steel fibers showed better behavior than those without steel fibers. The HSNWC gave a negative impact on the vibration of the one-way ribbed slab at both operation frequencies (25 and 50) Hz, while using HSLWC with and without steel fibers, led to reducing the vibration effect by (30.11and 30.68) % and (15.26 and 20.25) % at 25Hz and 50Hz, respectively.