Accession Number : ADA336029

Title :   Design and Performance Testing of Prestressed Precast Reinforced Concrete Double-Tee Beams With Web Openings

Descriptive Note : Final rept.

Corporate Author : CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL

Personal Author(s) : Saleh, Moshen A. ; Brady, Pamalee A. ; Einea, Amin ; Tadros, Maher K.

PDF Url : ADA336029

Report Date : DEC 1997

Pagination or Media Count : 145

Abstract : Conventional precast reinforced concrete double-tee joists may be made more structurally efficient by incorporating large openings in the web to accommodate environmental pipes and ducts. Double-tee joists with web openings may also reduce the total required building height, which would significantly lower costs for labor and materials during new construction. This report presents a method for designing prestressed precast reinforced concrete double-tee joists with web openings. Alternative designs were investigated by varying parameters such as prestressing strand layout, opening pier width, and pier reinforcement. Test results from six prestressed concrete joists are presented to substantiate finite element analysis results. The effect of web openings on beam behavior is discussed, and a simple method for designing the beams is presented. It is concluded that double-tee joists can be designed and manufactured with many web openings without jeopardizing beam strength. However, due to the effect of concentrated loading on shear failure modes in the tests, double-tee designs with web openings are recommended only floor and roof applications where only uniform loading will occur. Material costs associated with this design are slightly higher than for conventional double-tee members, but the design promotes an overall reduction in new construction costs.

Descriptors :   *PERFORMANCE TESTS, *DESIGN CRITERIA, *CONSTRUCTION MATERIALS, *PRECAST CONCRETE, *PRESTRESSED CONCRETE, TEST AND EVALUATION, SHEAR PROPERTIES, ENVIRONMENTS, LOW COSTS, FINITE ELEMENT ANALYSIS, FLOORS, FAILURE, PIPES, DUCTS, STRENGTH(GENERAL), PIERS, STRANDS, ROOFS.

Subject Categories : Construction Equipment, Materials & Supplies

Distribution Statement : APPROVED FOR PUBLIC RELEASE