Camber Requirements for Pretensioned Members


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Title: Camber Requirements for Pretensioned Members

Author(s): Donald R. Buettner and James R. Libby

Publication: Concrete International

Volume: 1

Issue: 2

Appears on pages(s): 66-72

Keywords: building codes; camber; cracking (fracturing); creep properties; deflection; modulus of elasticity; moments of inertia; prestressed concrete; pretensioning; shrinkage; structural design.

Date: 2/1/1979

Camber in pretensioned prestressed concrete members has been found to be both variable and unpredictable in many instances. Considerable problems can result in the field when actual cambers do not agree with anticipated (calculated) values or when cambers vary markedly between adjacent elements in a structure. The paper presents field data illustrating the variability problem, a calculation procedure and example to illustrate a method and suggests ACI Building Code requirements which include a limit on the difference between anticipated (calculated) and actual cambers.