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Second Order Effects Design Of Reinforced Concrete Framed Structures According To EC2-reliability Analysis


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J. Delgado & R. Delgado


Second order effects design of reinforced concrete framed structures according to EC2 - reliability analysis J. Delgado1 & R. Delgado2 1 Escola Superior de Tecnologia e Gestio, Instituto Politicnico de Viana do Castelo, Viana do Castelo, Portugal 2 Departamento de Engenharia Civil, Faculdade de Engenharia da Universidade do Porto, Porto, Portugal Abstract The structural conception of common buildings is normally supported by a framed reinforced concrete structure modelation. These kind of structures are designed according to the actual European design codes for reinforced concrete structures, based on partial factors of safety. The vertical elements design must include second order effects, which are evaluated by using simplified methods, like those prescribed by EC2. The combination between these methods and the partial factors of safety security model does not give an explicit idea about global structures safety margins. Once defined a methodology of probability of failure estimation - based on the Latin Hypercube Sampling (LHS) simulation method and on a, geometric and material, non linear computational code for structural analysis - the probability of failure of a set of regular structures designed by EC2 code rules were evaluated. 1 Introduction Structural design of regular buildings his made according to simplified models. First order internal forces evaluation is based on elastic structural models, and sections strength calculated in agreement with simplified materials behavior laws and prescribed failure conventions. The obtained elements internal forces and sections strength, are affected by partial factors of safety, which, according to the actual European codes, allows to achieve a previously defined reasonable safety level. Still according to the actual European codes, these procedures must have in addition a special treatment of vertical elements, in order to consider the