Effects of Shear Reinforcement on the Large-Deflection Behavior of Reinforced Concrete Slabs
Woodson, Stanley Clyde
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https://hdl.handle.net/2142/72202
Description
Title
Effects of Shear Reinforcement on the Large-Deflection Behavior of Reinforced Concrete Slabs
Author(s)
Woodson, Stanley Clyde
Issue Date
1993
Doctoral Committee Chair(s)
Gamble, William L.
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Abstract
Most design guides and manuals for blast-resistant reinforced concrete structures stipulate the use of shear reinforcement in roof, floor, and wall slabs irrespective of shear stress levels. The primary purpose of the shear reinforcement is not to resist shear forces, but rather to improve performance in the large-deflection region by tying the two principal reinforcement mats together. Shear reinforcement used in blast-resistant slab design usually consists of either lacing bars or single-leg stirrups. Lacing bars are reinforcing bars that extend in the direction parallel to the principal reinforcement and are bent into a diagonal pattern between mats of principal reinforcement. The lacing bars enclose the transverse reinforcing bars (often referred to as temperature steel) which are placed external to the principal reinforcement for a laced slab. The cost of using lacing reinforcement is considerably greater than that of using single-leg stirrups due to the more complicated fabrication and installation procedures.
A considerable amount of relatively recent (1970's and 80's) data from various experiments conducted on slabs indicated that the shear reinforcement design criteria that is typical of current design manuals may be excessive. The data base is presented in this paper and primarily consists of slab tests conducted to investigate parameters other than shear reinforcement details.
Since a thorough study of the role of shear reinforcement (stirrups and lacing) in structures designed to resist blast loadings or undergo large deflections has never been conducted, sixteen one-way reinforced concrete slabs were statistically (slowly) loaded with water pressure in the 4-foot-diameter blast load generator located at the U.S. Army Engineer Waterways Experiment Station. The investigation merged together an understanding of the history of the development of current design criteria with new data that showed similar effects of lacing bars and stirrups. The data from these experiments support the more aggressive response limits that are also presented.
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