Shallow flat soffit precast concrete floor system

Eliya Henin, George Morcous, Maher K. Tadros

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


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-×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.

Original languageEnglish (US)
Pages (from-to)101-110
Number of pages10
JournalPractice Periodical on Structural Design and Construction
Issue number2
StatePublished - May 1 2013


  • Beam ledge
  • Column corbel
  • Flat soffit floor
  • Hollow-core
  • Precast concrete
  • Shallow beam

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Arts and Humanities (miscellaneous)


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