No abstract

No abstract

This work presents a numerical model for 3D analyses through the finite element method of reinforced concrete structures subjected to monotonic loads. The proposed model for concrete is orthotropic and uses the equivalent uniaxial strain concept. The equivalent uniaxial stress-strain relation is generalized to take into account the triaxial stress conditions. The parameters used in the equivalent uniaxial stress-strain curve are determined from the failure surface defined in the principal stress space. The implementation in finite elements is based on the consideration of smeared cracks with cracks rotating according to the directions of the principal stresses. Also, an embedded reinforcement model was implemented to represent existent reinforcing bars. Finally, some results are compared with experimental data from the literature to demonstrate the validity of the numerical model developed.Keywords: reinforced concrete; finite element method; constitutive models; orthotropic model. Este trabalho apresenta um modelo numérico para análise tridimensional de estruturas de concreto armado submetidas a cargas monótonas. O modelo proposto para o concreto é um modelo ortotrópico e utiliza o conceito de deformação uniaxial equivalente. A relação tensão-deformação uniaxial equivalente é generalizada para levar em consideração as condições triaxiais de tensão. Os parâmetros usados na curva tensão-deformação uniaxial equivalente são determinados a partir da superfície de ruptura definida no espaço de tensões principais. Também, implementouse um modelo de armadura incorporada para representar as barras de armadura. Por fim, apresentam-se resultados comparativos com ensaios experimentais e analíticos para demonstrar a validade do modelo numérico. Civil and Environmental Engineering, Federal University of Pernambuco, giuliana.franca@gmail.com, BR 104, Km 59, S/N, Nova Caruaru, Caruaru, Pernambuco, Brazil b Graduate Program in Civil Engineering, Federal University of Rio Grande do Sul, americo@ufrgs.br, apacheco@ufrgs.br, Av. Osvaldo Aranha -99, 3º andar, 90035-190, Porto Alegre, Rio Grande do Sul, Brazil Received: 07 Feb 2011 • Accepted: 03 Jun 2011 • Available Online: 07 Oct 2011 Abstract Resumo Palavras

No abstract

Cable-stayed structures have become popular worldwide as one of the main alternatives for bridge designs with spans from 200 to 1000 m. Due to the dimensions of the structural elements that typically compose such bridges and their nonlinear structural behavior, it is usually employed in the designing