Mechanical Model for Shear Failure Based on Material Constitutive Model under Cyclic Loading -Deformation Evaluation of Column Base System of Steel Structures Employing Steel Fiber Reinforced Cementitious Composite-

Abstract

A constitutive material model is proposed to simulate cyclic shear behaviors of column base system for steel structures filled with Steel Fiber Reinforced Cementitious Composite (SFRCC). This cyclic model is developed based on a rotating crack formulation assuming a constant width of damaged region and adopts an orthogonal constitutive model combined with hysteresis curves in tension and compression sides. An analysis model composed of (1) horizontal shear springs, which represent SFRCC and to which the proposed cyclic model is applied, and (2) vertical beam elements representing a steel column, is prepared to simulate the shear behavior of columns base. The analysis well estimates the experimental results of column base specimens conducted in previous researches.