Fully probabilistic design: the way for optimizing of concrete structures

Abstract

Some standards for the design of concrete structures (e.g. EC2 and the original ČSN 73 1201-86) allow a structure to be designed by several methods. This contribution documents the fact that even if a structure does not comply with the partial reliability factor method, according to EC2, it can satisfy the conditions during the application of the fully probabilistic approach when using the same standard. From an example of the reliability of a prestressed spun concrete pole designed by the partial factor method and fully probabilistic approach according to the Eurocode it is evident that an expert should apply a more precise (though unfortunately more complicated) method in the limiting cases. The Monte Carlo method, modified by the Latin Hypercube Sampling (LHS) method, has been used for the calculation of reliability. Ultimate and serviceability limit states were checked for the partial factor method and fully probabilistic design. As a result of fully probabilistic design it is possible to obtain a more efficient design for a structure.Keywords: probabilistic design, partial reliability factor, concrete structures design.Algúnos estándares para el diseño de estructuras de hormigón (p. ej. EC2 y la original ČSN 73 1201-86) permiten que las estructuras sean diseñadas utilizando diferentes métodos. Esta contribución trata casos en los cuales una estructura dada que incluso no obedece el método de índice de confiabilidad parcial, de acuerdo a EC2, puede satisfacer las condiciones requeridas durante la aplicación del método probabilístico cuando se usa el mismo estándar. Tomado de una muestra de la confiabilidad de un hormigón pretensado hilado diseňado con la ayuda del método de índice parcial y por el método probabilistico de acuerdo al código Euro (Eurocode) es evidente que un experto debe aplicar un método más preciso (pero desafortunadamente más complicado) en los casos limitantes. El método Monte Carlo modificado por el método (LHS) Latin Hybercube Sampling ha sido utilizado para efectuar el cálculo de confiabilidad. Los límites extremos y de utilidad fueron comprobados para el método de índice parcial y diseño probabilístico completo. Como resultado del método de diseño probabilístico es posible obtener un diseño más eficiente para una estructura.Palavras-chave: diseño probabilístico, índice de confiabilidad parcial, diseño de estructuras de hormigón. Technology, Faculty of Civil Engineering, zlamal.m@fce.vutbr.cz, Veveří 95, 602 00 Brno, Czech Republic Received: 26 Nov 2010 • Accepted: 27 Mar 2011 • Available Online: 10 Jun 2011 Abstract Resumo Fully probabilistic design -the way for optimising of concrete structures

Optimized Design of Concrete Structures considering Environmental Aspects

“…It is also used for inverse analysis to obtain parameters of a computational model in order to achieve the best agreement with experimental data within the utilization of the efficient small-sample simulation method by Novák and Lehky ′ (2006). The design and assessment were carried out with software based on the algorithms determined and mentioned in Laníková et al (2010). This software was set up primarily for the use in the partial factor method but then was modified for application in fully probabilistic design.…”

Probability-Based Design and Life Cycle Assessment of a Spun Concrete Pole

“…Design and assessment were carried out with software based on the algorithms determined and mentioned in [5]. This software was set up primarily for use with the partial factor method but then was modified for application in fully probabilistic design.…”