Monotonic and hysteretic model for H-shaped beams incorporating deterioration behavior owing to the local buckling

Abstract

To investigate the collapse behavior of steel frames under the random earthquake, it is essential to grasp the hysteretic behavior of beam members. However, in the large-deformation region, the behavior of beams is difficult to be captured precisely because of the local buckling of the flange plate and the web plate. This paper presents a method to obtain the monotonic curve and the hysteretic curve efficiently for H-shaped beams subjected to bending moment. 96 models for H-shaped beams were designed and analyzed under the monotonic and cyclic loading using finite element analysis. Parameter study was implemented to grasp the influence of width-to-thickness ratio, shear span, and the beam depth. Depending on the numerical analysis, a monotonic model was proposed which can obtain the monotonic curve precisely and efficiently. Consequently, through combining with the modified Ibarra-Medina-Krawinkler hysteretic model, the accuracy for predicting the hysteretic behavior of beams was verified through comparing with the numerical results.