Comparision of Prestressed Hollow Core Slab and Precast Concrete Beam‐Hcb Slab System
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Date
2008-01
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Addis Ababa University
Abstract
A prestressed hollow core slab element studied in this thesis is a precast prestressed
concrete member with continuous voids provided to reduce weight and, therefore, cost and,
as a side benefit, to use for concealed electrical or mechanical runs. Primarily used as floor
or roof deck systems, hollow core slabs also have applications as wall panels, spandrel
members and bridge deck units. This system of construction does not require form work
and Propping during installation.
Precast, prestressed concrete floors offer significant advantages in many types of
building construction. They offer design, time and cost advantages over other flooring
materials and systems and are suitable for use with all structural systems, i.e. concrete,
masonry and steel
In our country precast prestressed concrete elements are not widely used for
construction of most buildings. The conventional cast in-situ construction require lots of
formwork and construction time, and also the precast beam-slab system construction
require propping and construction time too which increases the total cost of a project.
When precast prestressed hollow core slab elements are introduced in vast amount in the
construction of buildings, an economical construction could be achieved.
The economy of the generalized hollow core slab system is require a short
construction time compared to precast beam slab system and in the quantity of slabs that
can be produced at a given time with a minimum of labor required. Each slab on a given
casting line will have the same number of pre-stressing strands. Therefore, the greatest
production efficiency is obtained by mixing slabs with the same reinforcing requirements
from several projects on a single production line. This implies that best efficiency for a
single project is obtained if slab requirements are repetitive.
In the present study, the advantages of prestressed hollow core slab elements, for
construction of the floor slabs of four story building, is shown by making cost comparison
between the precast beam-slab system and pre-stressed hollow core slab system. For this
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purpose, the same span length is chosen for the two slab systems. These elements are
designed for loads they should sustain when used in the construction of slabs.
Finally cost comparison is made between the two systems of slab construction. The
cost comparison showed that the prestressed hollow core slab system
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Structural Engineering