Abstract
This paper numerically studied the collapse capacity of high-rise steel moment-resisting frames (SMRFs) using various width-to-thickness members subjected to successive earthquakes. It was found that the long-period component of earthquakes obviously correlates with the first-mode period of high-rises controlled by the total number of stories. A higher building tends to produce more significant component deterioration to enlarge the maximum story drift angle at lower stories. The width-to-thickness ratio of beam and column components overtly affects the collapse capacity when the plastic deformation extensively develops. The ratio of residual to maximum story drift angle is significantly sensitive to the collapse capacity of various building models. A thin-walled concrete filled steel tubular (CFST) column is proposed as one efficient alternative to enhance the overall stiffness and deformation capacity of the high-rise SMRFs with fragile collapse performance. With the equivalent flexural stiffness, CFST-MRF buildings with thin-walled members demonstrate higher capacity to avoid collapse, and the greater collapse margin indicates that CFST-MRFs are a reasonable system for high-rises in seismic prone regions.
Highlights
The 2011 Great East Japan earthquake had devastating losses on human life, buildings and infrastructures near the seismic epicenter, and long-period ground motions excited resonance with high-rise buildings [1]
concrete filled steel tubular (CFST) columns have been more adopted in high-rise buildings since
Since the existing high-rise when subjected to long‐period ground motions, CFST columns are proposed to substitute the hollow steel moment-resisting frames (SMRFs) entail collapse potential when subjected to long-period ground steel section (HSS) columns because the composite action can delay the local buckling and improve motions, CFST columns are proposed to substitute the hollow steel section (HSS) columns because the the strength of in‐filled concrete
Summary
The 2011 Great East Japan earthquake had devastating losses on human life, buildings and infrastructures near the seismic epicenter, and long-period ground motions excited resonance with high-rise buildings [1]. Studied a method to improve the distribution of story drift angle responses in CFST moment-resistant conducted a research on the bond behavior of concrete filled steel tubular frames under cyclic frames under severe earthquakes [18]. Nenavit experimentally studied the seismic behavior of concrete-filled steel tubular frame to reinforced and Hajjar (2012) conducted a nonlinear seismic analysis of circular concrete‐filled steel tube concrete (RC) shear wall high-rise mixed structures [20]. Since the existing high-rise when subjected to long‐period ground motions, CFST columns are proposed to substitute the hollow steel moment-resisting frames (SMRFs) entail collapse potential when subjected to long-period ground steel section (HSS) columns because the composite action can delay the local buckling and improve motions, CFST columns are proposed to substitute the hollow steel section (HSS) columns because the the strength of in‐filled concrete.
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