It is a key economic criterion for multistory residential and office buildings to have a shallow floor that minimizes floor height and
saves in the cost of architectural, mechanical, and electrical systems. This paper presents the development of a new precast concrete floor system
that eliminates the need for column corbels and beam ledges while being shallow. The proposed system can achieve a span-to-depth ratio of 30
and flat soffit while being consistent with prevailing erection techniques. The proposed system consists of continuous precast columns, prestressed
rectangular beams, hollow-core (HC) planks, and cast-in-place composite topping. The paper presents the construction sequence of
the new system and focuses on testing HC-beam connections without ledges in a full-scale specimen. Testing results indicate that a 30-cm-deep
flat soffit precast floor system has adequate capacity to carry gravity loads (including 488 kg/m2 live load) in a 9.14- 3 9.14-m bay size. Also,
testing shows that shear capacity of the proposed HC-beam connections without ledges can be accurately predicted using the shear friction theory.
تاريخ النشر
05/01/2013
الناشر
Practice Periodical on Structural Design and Construction Journal
ايليا عزت عشم حنين | Eliya Ezzat Asham Henin, Ph.D., P.E., S.E., PMP. | 4547