METHODOLOGY OF STEEL BRIDGES STRUCTURAL EVALUATION BY STRUCTURAL RELIABILITY TECHNIQUES

Edgar Muñoz, Rubén Daza, Felipe Salazar

Abstract


In Colombia, when a structural review of steel bridges is performed, the design loads, materials specifications andsafety factor are verified as established in the Colombian Code of Bridges Seismic Design (CCDSP). This evaluation is notat all reliable, since it does not bear in mind topics related to structural changes, that could occur due to materials qualityalterations, some element deformation by temperature changes or by the difference in loads that bridges have to support. Ifwe bear in mind that there exists factors of unknown nature that can alter the operation structure, it is necessary to apply anevaluation method that combines stochastic and statistical functions with the structural analysis as the one based onstructural reliability, which shows a bridge's real working conditions. This paper develops the methodology for steelbridges evaluation using structural reliability techniques based on American an European studies, mentioning the maindifferences found during the structural evaluation of Puerto Salgar bridge. The method stated presents the possibility ofprojecting the safety of bridge, which involves a preventive method with big advantage over CCDSP.

Keywords


Structural evaluation; structural reliability; design review; truck load; material resistance; limit condition; reliability index; probability distribution; Montecarlo's numerical simulation.

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