A DIRECT CONVERGENCE SOLUTION IN AN EARTHQUAKE RESPONSE ANALYSIS OF THE SYSTEM USING FIBER-MODEL

Abstract

In this paper, the authors propose a new earthquake response analysis method applying Newmark's β-method and using Fiber-Model. In general, the tangential stiffness of every structural member is necessary for earthquake response analyses, however in the case Fiber-Model is applied to the columns subject to bi-directional moments or variable axial forces, it is impossible to calculate the stiffness. In the proposed method, the equation of equilibrium in Fiber-Model is directly solved by giving the equation of motion as a restricted condition without calculating the tangential stiffness. The authors show its propriety by applying it to a RC column of a single-mass and three-degree-of-freedom system and a 1-span 1-story plane frame.