Análisis no lineal del puente de sección compuesta tipo de 135 metros de longitud usando SAP2000

Abstract

Given the importance of bridges for the road, social and economic development of the country, the design and verification of seismic performance is imperative; this project takes a first step towards that goal by understanding the nonlinear behavior of typical Ecuadorian composite bridges. For this purpose, the case study of a steel bridge built in 2020 and located in province of Los Ríos, Ecuador, has been taken as a case study. To achieve this objective, we have taken bibliography present in articles, guides and normative standards, especially international; the nonlinear responses of components such as: superstructure, columns, elastomeric supports, vertical seismic bars, passive response of the fill in abutments and seismic restraints are proposed and constructed with the objective of representing the real behavior of a bridge against the earthquake of April 16, 2016 occurred in Ecuador, specifically the one registered in the city closest to the project (Portoviejo). The nonlinear time response analysis is performed in the commercial program and the behavior of the bridge and is obtained considering the two orthogonal components of the earthquake. The results obtained are displacements, velocities and accelerations of the superstructure and pier, moment-rotation in the central pier, force-displacement curves of the non-linear elements such as vertical bars, supports, braces, etc. From the above, it is possible to determine that there would be impact between beams-shear keys, superstructure - abutments and in the joint separating the multispam simple supported; it is also observed that certain components present limited levels of displacement such as fillers, vertical bars and columns; on the contrary, the element that would present the greatest damage are the shear keys in the central pile and elastomeric supports, especially their lateral response. The analysis of each component was developed in detail and appended for academic purposes, so that future research can apply this methodology to the evaluation of new and existing bridges.