Concrete Beams with Openings

Concrete Beams with Openings
Author: M. A. Mansur
Publisher: CRC Press
Total Pages: 240
Release: 1999-01-29
Genre: Technology & Engineering
ISBN: 9780849374357

This book compiles state-of-the-art information on the behavior, analysis, and design of concrete beams containing transverse openings. Discussions include the need, effects, and classification of openings as well as the general requirements for fulfilling design pure bending, combined bending, and shear - illustrated with numerical examples torsion alone or in combination with bending and shear large rectangular openings as well as opening size and location on beam behavior methods for analyzing ultimate strength and serviceability requirements effects of torsion in beams large openings in continuous beams and their effects on possible redistribution of internal forces as well as guidelines and procedures for the design of such beams effect of prestressing on the serviceability and strength of beams with web openings design against cracking at openings and ultimate loads Concrete Beams with Openings serves as an invaluable source of information for designers and practicing engineers, especially useful since little or no provision or guidelines are currently available in most building codes.

Design and Performance Testing of Prestressed Precast Reinforced Concrete Double-tee Beams with Web Openings

Design and Performance Testing of Prestressed Precast Reinforced Concrete Double-tee Beams with Web Openings
Author: Mohsen A. Saleh
Publisher:
Total Pages: 142
Release: 1997
Genre: Concrete
ISBN:

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.