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Review of Deflection Provisions for Reinforced and Partially (Cracked) Prestressed Concrete
A number of design codes and standards have begun to adopt a new expression for the effective moment of inertia used to compute immediate (short-term) deflection of reinforced (nonprestressed) concrete flexural members. This has led to renewed interest in serviceability requirements, including short- and long-term deflection of reinforced concrete, deflection of partially prestressed (cracked) concrete, and minimum thickness requirements for deflection control. Deflection of prestressed concrete is computed using properties of the gross (uncracked) section when the member is uncracked under service loads. Long-term deflection multipliers are available, but normally not prescribed for prestressed concrete as additional time dependent deflection needs to consider stresses in the concrete and steel under sustained load that include the effects of creep and shrinkage of concrete and relaxation of steel. Deflection of a cracked (partially) prestressed concrete member is more problematic and not well understood. A review of new and existing provisions for calculating deflection of reinforced and partially prestressed (cracked) concrete is provided, followed by development of a rational and comprehensive deformation model for computing short- and long-term deflection of reinforced and partially prestressed concrete that is cracked under service loads.
Review of Deflection Provisions for Reinforced and Partially (Cracked) Prestressed Concrete
A number of design codes and standards have begun to adopt a new expression for the effective moment of inertia used to compute immediate (short-term) deflection of reinforced (nonprestressed) concrete flexural members. This has led to renewed interest in serviceability requirements, including short- and long-term deflection of reinforced concrete, deflection of partially prestressed (cracked) concrete, and minimum thickness requirements for deflection control. Deflection of prestressed concrete is computed using properties of the gross (uncracked) section when the member is uncracked under service loads. Long-term deflection multipliers are available, but normally not prescribed for prestressed concrete as additional time dependent deflection needs to consider stresses in the concrete and steel under sustained load that include the effects of creep and shrinkage of concrete and relaxation of steel. Deflection of a cracked (partially) prestressed concrete member is more problematic and not well understood. A review of new and existing provisions for calculating deflection of reinforced and partially prestressed (cracked) concrete is provided, followed by development of a rational and comprehensive deformation model for computing short- and long-term deflection of reinforced and partially prestressed concrete that is cracked under service loads.
Review of Deflection Provisions for Reinforced and Partially (Cracked) Prestressed Concrete
Lecture Notes in Civil Engineering
Walbridge, Scott (editor) / Nik-Bakht, Mazdak (editor) / Ng, Kelvin Tsun Wai (editor) / Shome, Manas (editor) / Alam, M. Shahria (editor) / El Damatty, Ashraf (editor) / Lovegrove, Gordon (editor) / Bischoff, Peter H. (author)
Canadian Society of Civil Engineering Annual Conference ; 2021
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2021 ; Chapter: 7 ; 75-86
2022-06-17
12 pages
Article/Chapter (Book)
Electronic Resource
English
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