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Investigating the Response Reduction Factor of Steel 3-D Braced Frames with Eccentricity
, M.Sc. Thesis Sharif University of Technology ; Khonsari, Vahid (Supervisor)
Abstract
Studying the performance of irregular structures in past earthquakes reveals that due to their severe vulnerability, we need to accurately assess the behavioral characteristics of such structures. On the other hand, all existing seismic codes recommend the use of response modification factor to determine the base shear, design forces of the members, and the design drift ratios, which seem to have limited comprehensiveness. Moreover, the response modification factor for a structural system is discussed in a general manner and the effect of factors such as number of bays, number of stories, span length, story height and irregularities are not considered. In this research, the effects of...
Evaluating Response Modification Factor of Steel Frames Equipped with A Special Type of Bracing
, M.Sc. Thesis Sharif University of Technology ; Khonsari, Vahid (Supervisor) ; Ghaemian, Mohsen (Supervisor)
Abstract
The response modification factor (coefficient of behavior) of structures (R) is a parameter that is used during their design using the linear static analysis method to account for the effects of the non-linear response of the structure considered. Therefore, the existing seismic codes consider it necessary to use the R factor during the design process. In addition, for each family of structural systems, the Codes propose a specific R factor in a very general manner. In this project, an effort has been made to obtain and propose a correct, relatively accurate, and logical coefficient of behavior for two-dimensional steel frames equipped with a special type of bracing. In this regard, the...
Performance-based seismic assessment of steel frames using endurance time analysis
, Article Engineering Structures ; Vol. 69 , 2014 , Pages 216-234 ; ISSN: 01410296 ; Sattar, S ; Estekanchi, H. E ; Sharif University of Technology
Abstract
The current performance-based seismic assessment procedure can be computationally intensive as it requires a large number of time history analyses (THA) each requiring time intensive post-processing of results. This study proposes the endurance time analysis (ETA) method as an alternative method to THA and incremental dynamic analysis (IDA). ETA is a time history based dynamic pushover procedure that applies a set of gradually intensifying acceleration functions to the structure and monitors the performance of the building accordingly. In this paper, the application of ETA in the seismic assessment of multistory steel concentrically braced frames is compared with THA and IDA methods....
Experimental and Numerical Evaluation of Cold-Formed Steel Shear Panel with Suitable Sheathing Under Seismic Loading
, Ph.D. Dissertation Sharif University of Technology ; Rahimzadeh Rofooei, Fayaz (Supervisor)
Abstract
In this thesis, the behavior of cold-form steel (CFS) frames equipped with various configurations of steel sheathing and K-shaped braces is experimentally investigated. Low lateral resistance is the main deficiency of the CFS shear walls. Despite their advantages, such as being lightweight, ease of fabrication, and an environmentally friendly system, their lack of adequate lateral strength prevents engineers from widely using them, especially in areas with medium to high seismicity or in mid-rise buildings. In this regard, a total of seven full-scale specimens with different configurations of steel sheathing and k-braced, with and without cladding, were tested to investigate their seismic...
Experimental and Numerical Evaluation of Light Steel Frame with Steel Shear Wall under Gravity Loadings and Subjected to Cyclic Loading
, M.Sc. Thesis Sharif University of Technology ; Rahimzadeh Rofooei, Fayyaz (Supervisor) ; Farahbod, Farhang (Co-Supervisor)
Abstract
Because of imbalance in supply and demand in the housing industry, the industrialization of building construction is one of the best ways to explain this problem. Currently, there is a strong tendency to develop guidelines for the design of Cold-Formed Steel (CFS) with different sheathing boards as seismic resistant shear walls. Also, the behavior of these systems is not very well known yet and more research is needed. In this work, six K-braced frames with and without sheathing boards and gusset plate under gravity loading and lateral cyclic loading investigated experimentally. The first and second specimens (single stud) as a control specimens are without sheathing board under gravity...