Resistance factors for shear capacity of ordinary and lightweight R/C beams

Author(s): A.S. Nowak, A.M. Rakoczy
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 537- 538
Total Pages: 2
Language: English

Abstract: 
The objective of this study is to develop reliability model for shear strength of reinforced concrete beams, and compare the differences between ordinary concrete and lightweight concrete. The analysis is based on recent material and component test data. The research is focused on the development of statistical parameters of the shear capacity for reinforced concrete beams. Resistance is considered as a product of three random variables representing the uncertainty in material properties, dimensions and geometry (fabrication factor) and analytical model (professional factor). Material test data is presented in form of the Cumulative Distribution Functions (CDF) plotted on the normal probability paper for an easier interpretation of the results. The most important parameters are the mean value, bias factor and the coefficient of variation. It was observed that the quality of material and workmanship has been improved over the last 30 years and this is reflected in reduced coefficients of variation. However, the lab tests of the beams show that current shear design procedure is less conservative for lightweight concrete compared to normal weight concrete. It means that the resistance factor for lightweight concrete has to be revised according to statistical model of resistance.

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00