Optimization of partially prestressed concrete girders under multiple strength and serviceability criteria

M. A. Khaleel, R. Y. Itani

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A comprehensive study on the optimization of simply supported partially prestressed concrete girders is presented. Using sequential quadratic programming a set of optimal geometrical dimensions, amounts of prestressing and non-prestressing steel, and spacing between shear reinforcements are obtained. The constraints used are based upon flexural stresses, fatigue stresses, crack width, ductility, initial camber, deflection due to both dead and live loads, ultimate moment capacity of the section with respect to cracking moment and factored loads, and the ultimate shear strength. Results point to the need for non-prestressing steel to obtain economical designs. Minor savings on the material occur when the section is allowed to crack. The ultimate moment capacity and the fatigue stress controlled the design in the cracked case. The tensile stress at service and the ultimate moment capacity were the binding constraints in the uncracked case. This study automates the design of partially prestressed concrete girders and provides needed design solutions to problems which are of importance to practicing engineers.

Original languageEnglish
Pages (from-to)427-438
Number of pages12
JournalComputers and Structures
Volume49
Issue number3
Publication statusPublished - 1 Nov 1993
Externally publishedYes

Fingerprint

Concrete beams and girders
Prestressed concrete
Moment
Optimization
Steel
Fatigue
Crack
Fatigue of materials
Cracks
Cambers
Shear Strength
Ductility
Prestressing
Quadratic programming
Cracking
Reinforcement
Quadratic Programming
Tensile stress
Shear strength
Deflection

ASJC Scopus subject areas

  • Computational Mechanics
  • Computer Science Applications

Cite this

Optimization of partially prestressed concrete girders under multiple strength and serviceability criteria. / Khaleel, M. A.; Itani, R. Y.

In: Computers and Structures, Vol. 49, No. 3, 01.11.1993, p. 427-438.

Research output: Contribution to journalArticle

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