Modeling Uncertainties in High-Strength Concrete Columns According to Reliability-Based Design Philosophy

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Title: Modeling Uncertainties in High-Strength Concrete Columns According to Reliability-Based Design Philosophy

Author(s): S. M. C. Diniz and D. M. Frangopol

Publication: Special Publication

Volume: 189

Issue:

Appears on pages(s): 431-450

Keywords: columns; compressive strength; confinement; high-strength concrete; loads; reinforced concrete; slenderness; variables

Date: 1/1/2000

Abstract:
ACI Code-95 recommendations for column design are based mostly on test results on concretes with strengths up to 42 MPa. Due to differences between high-strength concrete (HSC) and normal-strength concrete (NSC) material and structural behavior, using these recommendations for HSC columns does not mean that the same level of safety as for NSC is obtained. As a consequence, the reliability that the same level of safety as for NSC is obtained. As a consequence, the reliability of HSC columns must be assessed. Since most of the variables involved in column design (material properties, geometric characteristics, loads, etc.) are random, a basic step in the reliability assessment of HSC columns is the modeling of uncertainties associated with both column strength, as well as, load effects is presented. Regarding the computation of the statistics of the HSC column strength, many issues have to be resolved: (a) the scarcity of information on the variability of the compressive strength of HSC; (b) the unavailability of a closed form solution to express column strength; and © the compatibility with the assumed failure criterion. Regarding the computation of the load effect statistics, special attention given to the case of slender HSC columns.