A Study on Pseudo-Elastic Analysis for Aseismic Capacity of Multiple-Story Steel Frame Considering the Effect of Material Anisotropy
Date Issued
2012
Date
2012
Author(s)
Huang, Seng-Jie
Abstract
This paper is to study the effect of anisotropic property of steel for seismic capacity of steel frame. Due to anisotropic property of steel plate, the yielding stress and ultimate strain is much lower in the through-thickness direction than in rolling direction of steel plate. However, there is an impact on the column faces of beam-column connections for the application of anisotropic steel members in the steel frame. Because beam members of beam-column connection by the effect of moment produce tension and pressure on column faces of beam-column connections, column faces of beam-column connections under tension are prone to a result of lamellar tearing in the through-thickness direction of column with anisotropic property. The tensile strength, shear capacity, moment resisting capacity, and ductility of column members and beam members will significantly go down and even induce serious damage of steel frame if column faces produce lamellar tearing.
The paper is to make use of reducing yielding stress of steel beams and columns for simulating the steel anisotropic mechanical behavior on the effect of stress for assessing seismic capacity of steel frame. Therefore, there are different reduction ratios of yielding stress to simulate differences of anisotropic property of steel member on the effect of seismic capacity of steel moment-resisting frames. Adopting methods of assessing seismic capacity of this research include Pseudo-elastic approach method and pushover analysis to obtain the structure nonlinear behavior as the analysis and comparison of seismic capacity. There is an assumption that structure behavior is linear firmly for the theory of Pseudo-elastic approach method. Firstly, it is essential to carry out members forces of structure under design earthquake by static analysis or dynamic analysis. Then, gradually enlarge the design earthquake, and thus members forces of structure will be amplified by the same scale. The structure behavior will not become inelastic until the first plastic hinge of the structure appears. According to the energy conservation principle, exceeding the elastic strain energy range of the total energy can be converted into the corresponding plastic energy by using Pseudo-elastic approach method with assumption of linear structure to figure out structure nonlinear behavior in the relationship of base shear and roof lateral displacement. Finally, the yielding lateral force, ultimate lateral force, ductility ratio, and collapsed ground acceleration of the structure can be worked out as the seismic capacity assessment index of the structure.
Due to Pseudo-elastic analysis method with the advantages of rapidity, simplicity and convenience on assessing the seismic capacity of structures, this study will make use of the Pseudo-elastic analysis method and pushover analysis of ETABS software to assess the impact of seismic capacity of multi-storey steel moment-resisting frames with differences of anisotropic property of steel member. According to analysis result, do with the comparison and evaluation in order to understand the differences of steel properties between isotropic and anisotropic for impact of seismic capacity of steel frames.
Subjects
Steel Frame
Anisotropy
Pseudo-Elastic Analysis method
Nonlinear static analysis
Seismic Capacity Assessment
SDGs
Type
thesis
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