Esra Mete Güneyisi
Tayfun Çınar
Abstract
In this study, the nonlinear analysis and seismic appraisal of composite frames having concrete filled steel tube columns (CFSTs) were investigated. The case study composite frames were made of the square columns surrounded by steel tube outside and infilled with concrete, and also steel I beams. These frames were taken as 4, 6 and 8 stories with three equal bays. Then, the nonlinear pushover analysis was applied to examine the influence of variation in the width-thickness ratio, slenderness ratio, yield strength of the steel tube and compressive strength of the concrete within the columns of each frame. Thus, a total of seventy-two different composite frame models with CFST columns and steel beams were examined in accordance with the response parameter of the base shear-top displacement. The obtained results were discussed comparatively as per the lateral capacity and initial stiffness. It was observed that the material and dimensional properties of the CFST columns influenced significantly the seismic behavior of the composite frames.
Keywords
Composite frame; Concrete filled steel tube column; Modeling; Nonlinear analysis; Seismic response.