Abstract
A comparative study has been done to analyze the behavior of regular steel building structures of 4, 6, 8 and 10 stories, located in seismic zone 5 and soil type S1. The structures were upgraded with different brace configurations according to current Venezuelan codes. A total number of 24 numerical models were analyzed considering non-linear static and incremental dynamic analysis (IDA). The buildings were initially designed as moment resisting frames, and upgraded with six different bracing configurations: concentric braces in “X” and inverted “V”; eccentric braces inverted "V" with horizontal links, inverted “Y” and “X” with vertical links. Short length links were used to ensure a shear failure. The used methodology is based on obtaining the capacity, IDA curves, and bilinear approximations of these curves that allow the determination of yield and ultimate capacity points, in order to estimate important parameters of seismic response: overstrength and ductility; and considering these areas under the curves to estimate elastic deformation energy, energy dissipated by hysteretic damping and equivalent damping. According to the results, the cases with no brace enhancement showed the lowest lateral strength and lateral stiffness and high deformation capacity. On the other hand, the concentric bracing cases, resulted with the highest stiffness and strength and the lowest deformation capacity, therefore they have low ductility and energy dissipation capacity under seismic loading. Structures with links showed intermediate stiffness and strengths, resulting in the best performance in terms of ductility and energy dissipation capacity. The present study provides a better understanding of the benefits of eccentrically braced systems.
Highlights
In developing countries, it is necessary to design economical steel building to obtain additional energy dissipation capacity under seismic actions, avoiding expensive solutions such as base isolation or energy dissipating devices
The present study provides a better understanding of the benefits of eccentrically braced systems
Modal elastic analysis, non-linear static analysis and incremental dynamic analysis are performed in order to obtain the capacity curves and IDA curves
Summary
It is necessary to design economical steel building to obtain additional energy dissipation capacity under seismic actions, avoiding expensive solutions such as base isolation or energy dissipating devices. The eccentrically braced frames (EBF) could be a suitable solution to obtain the required strength, stiffness and energy dissipation capacity on steel buildings [2, 3]. The behavior of structures under seismic actions depends on many factors such as the system used to resist lateral forces, construction materials and structural configurations. These factors usually have important implications in the final deformation, energy dissipation and resistant capacity. Research has shown that the eccentric bracing frames (EBF) have the ability to combine a high stiffness in the elastic range, and excellent ductility and energy dissipation in the inelastic range. The distance between the beam and bracing connection or distance between connections and the braces is called "link", zone of energy dissipation
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