Abstract
Flat slab systems are vastly used in multi-story buildings because of their savings in story height and construction time, as well as for their flexibility in architectural remodeling. However, they frequently suffer brittle punching-shear failure around columns, especially when subjected to lateral loads. Therefore, seismic codes labeled flat slabs as non-ductile systems. This research goal is investigating some construction alternatives to enhance flat slab ductility and deformability. The alternatives are: adding different types of punching-shear reinforcement, using discreet fibers in concrete mixes, and increasing thickness of slab around columns. The experimental study included preparation and testing of seven half-scale interior slab-column connections up to failure. The first specimen is considered a reference, the second two specimens made of concrete mixes with different volumetric ratios of polymer fibers. Another three specimens reinforced with different types of punching-shear reinforcement, and the last specimen constructed with drop panel of inverted pyramidal shape. It is found that using the inverted pyramid-shape drop panel of specimen, increases the punching-shear capacity, and the initial and the post-cracking stiffnesses. The initial elastic stiffnesses are different for all specimens especially for the slab with closed stirrups where it is experienced the highest initial stiffness compared to the reference slab.
Highlights
Flat slabs are preferred in multi-story construction due to its economical and architectural benefits
These benefits include; reducing the construction time and reducing story height, which results in more stories for the same building, as well as their flexibility in architectural remodeling
Another three specimens reinforced with different types of punching-shear reinforcement, and the last specimen constructed with drop panel of inverted pyramidal shape
Summary
Flat slabs are preferred in multi-story construction due to its economical and architectural benefits These benefits include; reducing the construction time and reducing story height, which results in more stories for the same building, as well as their flexibility in architectural remodeling. They have been discredited by many seismic codes for less ductile behavior, and poor energy absorption (IBC 2009; Eurocode 8 2004; ACI 421-1R 2008). The method uses ductility and energy absorption characteristics of structures to dissipate large amount of the seismic imparted energy, which boosts the structural safety and reliability. At the same time prevent any possibility of brittle failure, such as, shear and bond failures
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