Título del libro: Uncecomp 2017 - Proceedings Of The 2nd International Conference On Uncertainty Quantification In Computational Sciences And Engineering
Título del capítulo: Reliability of prestressed concrete bridge girders using field information and the combined approach
ADRIAN DAVID GARCIA SOTO;
Autores externos:
Idioma:
Inglés
Año de publicación:
2017
Palabras clave:
Bridge girders; Combined method; Field information; Prestessed concrete; Reliability
Resumen:
Field information on live loads and concrete strength is used to assess the reliability of a prestressed precast concrete girder of an existing bridge in Guanajuato State (Central Mexico). A recently developed method, termed the combined approach (CA), is used to perform the reliability analysis. The approach combines two well-known techniques: The first order reliability method (FORM) and the point estimate method (PEM). Information on the bridge design, live load from weigh-in-motion data and compressive strength of concrete cores, was gathered for this study through two research projects. The information is employed to probabilistically characterized the demand and the capacity of the bridge prestressed concrete girders. A numerical scheme is used to obtain the girder bending capacity, and the bending capacity of the point estimates for the reliability analysis, by considering common design practices in Mexico. The use of a numerical method can be required, or more practical, if non-common geometries and prestressed steel and /or reinforcement steel arrangements are used (e.g., non-Tension-controlled girders). This implies that the limit state function (LSF) could only be implicitly known, and the FORM may not be feasible, while the Monte Carlo simulation technique (MCS) may require extensive samples. The present study shows the results of the reliability levels for the bridge girder for a range of mean live to dead load effects. This reliability is obtained with information directly gather on field for the bridge under study, for a traffic jam scenario and for a single vehicle passage scenario. It is concluded that the CA can be an adequate alternative to perform the reliability analysis, especially when there is no explicit limit state function (as for instance required in the FORM), and without the need of extensive simulations (unlike the MCS). Some codified design implications are discussed from the resulting reliability levels, and future research for several issues is recommended. © 2017 The Authors. Published by Eccomas Proceedia.
Entidades citadas de la UNAM:
ISBN:
9786188284449
Editorial:
National Technical University of Athens
