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Seismic fragility assessment of high-rise steel buildings strengthened with moment resisting and bracing frames and under various soil conditions to the ASCE and Eurocodes regulations

Vafaei Shalmani, M. (2022). Seismic fragility assessment of high-rise steel buildings strengthened with moment resisting and bracing frames and under various soil conditions to the ASCE and Eurocodes regulations. (Unpublished Doctoral thesis, City, University of London)

Abstract

This study aims to focus on finding out some effective methods to assess possibility of collapse and behaviour of high-rise steel structure with different lateral stability systems under seismic loadings. Seismic Fragility functions are a powerful method to characterize the probabilistic vulnerability of buildings under earthquake. Therefore, the aim of this research is to develop fragility curves for moment resisting and braced steel framed buildings (V and X-bracing system) with slim deck flooring system.

This thesis investigated the probability of the failure of high-rise steel buildings under seismic loads. There are several experimental and numerical researches implemented in this subject area which have guided other researchers to understand better the failure mechanism and likelihood of buildings under seismic activities. However, due to the lack of research and data with regard to high-rise structures, the main aim of the research is to develop high resolution fragility curve of high-rise buildings and to find out the roles of the different lateral stability systems in resisting earthquake load. Furthermore, the new flooring system, i.e. slim deck flooring system, has been considered in the present research. In addition, the effect of slab steel reinforcement in energy dissipation for the structure is also studied in this research.

For this PhD research project, 3D numerical models of buildings have been built. Over two hundred time-history analyses have been made for different types of steel frames with various stability systems in the process to generate the fragility curves. The soil types, peak ground acceleration of earthquake and the connection of structural elements and different design guidelines used in the analysis have been taken into the account. During the analysis, three dimensional components of ground motion acceleration have been applied to the foundation of the structure. The method of generating fragility curves is analytical. This method is beneficial regarding construction cost and accuracy. However, its drawback is that it is time consuming. In addition, the energy dissipation and collapse mechanism of structure are the key aspects that have been take into the account alongside of the study.

This study aims at using a time-history analysis to simulate the possibility of failure in high-rise braced structures under seismic activities and to develop the fragility curve. In addition, the analysis will be carried out based on the Eurocode and ASCE and there will be a comparison of Eurocode’s results versus ASCE’s outcomes.

Publication Type: Thesis (Doctoral)
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TH Building construction
Departments: Doctoral Theses
School of Science & Technology > School of Science & Technology Doctoral Theses
School of Science & Technology > Engineering > Civil Engineering
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