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

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 ۱۹.۳۱%, the strength by ۱۷.۷۰%, and ultimate deflection by ۱۷.۳۳%. 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 ۱۴.۴۹%. 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 (۲۵ and ۵۰) Hz, while using HSLWC with and without steel fibers, led to reducing the vibration effect by (۳۰.۱۱and ۳۰.۶۸) % and (۱۵.۲۶ and ۲۰.۲۵) % at ۲۵Hz and ۵۰Hz, respectively.

کلیدواژه ها:

Steel Fiber ، Ribbed slab ، sugar molasses ، serviceability ، Harmonic loading