Abstract
Abstract:Moment resisting frames are considered as an effective seismic force resisting system that is used for steel structures. Some of these structures that were built in high seismic hazard zones were designed according to old strength-based design codes. Currently, these structures do not meet the requirements of the new seismic codes. Therefore, the seismic retrofit of these structures is mandatory and cannot be overlooked. Steel braces and concrete-steel composite elements are common solutions for enhancing the seismic behavior of existing steel frame structures. This paper presents a numerical study that evaluates different possible techniques for the seismic retrofit of existing steel moment-resisting frame structures. The study investigates the performance of three multi-story buildings with different heights that are located in a high seismic hazard zone. Three retrofit techniques were introduced including; 1) X-Steel braces, 2) buckling restrained composite braces, and 3) composite concrete-steel plate shear walls. The seismic performance enhancement of the studied structures was evaluated in terms of the structure’s fundamental period, maximum inter-story drift and maximum base shear-to-weight ratios. Moreover, the cost of retrofitting material was estimated for each technique and they were compared to select the retrofit technique with the least constitutive material cost.
Highlights
Steel moment-resisting frame structures located in high seismic hazard zones are susceptible to excessive lateral deformations during strong ground motions
The objective of this study is to investigate the seismic performance of three multi-story steel frame buildings with different heights that are located in a high seismic hazard zone
It can be seen that the retrofit schemes decreased the structures’ fundamental periods due to the additional stiffness provided by the retrofit system
Summary
Steel moment-resisting frame structures located in high seismic hazard zones are susceptible to excessive lateral deformations during strong ground motions. Some of these structures were designed according to strength-based codes, and they are in an urgent need for seismic retrofit. Excessive damage of non-structural elements should be avoided. The objective of this study is to investigate the seismic performance of three multi-story steel frame buildings with different heights that are located in a high seismic hazard zone. The seismic performance enhancement of the studied structures was evaluated in terms of the structure’s fundamental period, maximum inter-story drift ratio and maximum base shear-to-weight ratio. The cost of retrofit material was estimated for each technique and they were compared to select the retrofit technique with the least constitutive materials for each height considered
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