Title: Sensitivity analysis to estimate the modulus of elasticity static concrete

Author(s): Maria Fernanda Serrano-Guzmán, Diego Dario Perez-Ruiz

Publication: IMCYC

Volume: 2

Issue: 1

Appears on pages(s): 17-30

Keywords: Concrete, elasticity modulus, strength, slump

DOI:

Date: 7/1/2010

Abstract:
During analysis and design of reinforced concrete structures is required the elasticity or Young Modulus of Concrete, Ec, which is related to the compressive strength. At the present the modulus of elasticity that is used in structural design in Colombia is based in the values recommended by the 1998 “Norma Sismo Resistente (NSR-98), '500,12ccfE=(kg/cm2), which does not account for locally available aggregates. A total of 611 concrete specimens were cured, each one with a compressive strength of 210 kg/cm2. The results analysis shown that the equation proposed by NSR-98 must be adjusted to be applied locally, recommending '250,6ccfE= (Kg/cm2). In addition, it is recommended to use the equation proposed by ACI when it is known the unit weight of the concrete. The modified ACI equation proposed is given by '5,1054,0ccfWE= (Kg/cm2). Furthermore, for concretes with W = 2,375 Kg/m3 and f’c = 210 kg/cm2 the NSR-98 equation overestimate the Ec in 50% Meanwhile, the ACI and the European Standard Equation overestimate the Ec in 24% and 46.2% respectively.