الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 362 |  |  |
| | | from | 362 | | |
Abstract
Usage of precast prestressed concrete hollow core (PPHC) slabs has been extensively spread
out in roofing and flooring systems around the globe due to benefits of mass production and fast site
construction. In this flooring system, prestressed precast hollow core slabs are used together with or
without a cast in place concrete topping. A few research works focused on studying the effect of using
concrete topping on enhancement of the structural integrity of the PPHC system. This research work
presents an experimental study conducted to investigate the effects of using different types of cast in
place (CIP) concrete toppings on the behavior of PPHC slabs. Ten typical full scale specimens of
PPHC slabs were prepared in precast concrete plant under quality control program; specimens were
classified into five groups. group (1) includes two control specimens without topping, group (2)
contains two specimens with ordinary reinforced concrete topping, group (3) involves two specimens
with ordinary reinforced concrete topping connected to the top surface of the slab using steel anchors,
group (4) comprises two specimens with fibrous concrete topping, and finally group (5) includes two
specimens with ferrocement topping. All test specimens were tested under static line loading until
failure. Cracking patterns, failure modes, cracking and ultimate failure moment capacities, and
moment- deflection relationship have been illustrated, discussed, and analyzed in this study. A finite
element model was also developed using Ansys program to validate the experimental tests. A
comparison between experimental and finite element results was also represented. Adding concrete
topping to the PPHC slabs enhances flexural behavior directly under static line loading, as the
cracking moment resistance was increased by about 6% to 31% and failure moment was increased by
about 11% to 41% by using concrete toppings.