Seismic Performance Evaluation Of Momentresisting Steel Frames With Two Softwares
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October 21, 2020
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Frame, Lateral Load, Nonlinear Dynamic, Pushover Analysis, Seismic Performance
Abstract
Moment resisting steel frames (MRSF), which are widely used as lateral load Resisting systems for low- to medium-rise buildings are one of the simplest ductile systems that can be built without bracing elements. The objective of this study is to evaluate the seismic behavior of a 6-story MRSF designed according to the Egyptian code using the DRAIN-2DX program and Siesmostruct program. The 6-story office building is considered to have moment resisting steel frames (MRSF) in the perimeter of the short direction and braced steel frames in the perimeter of the long direction to carry the seismic loads. The focus of this study is to evaluate the seismic performances of the building MRSF using the two computer programs SeismoStruct and DRAIN-2DX. Seismic evaluation in this study has been carried out by static pushover analysis and time history earthquake analysis for nonlinear static analysis of building structures. The columns and beams are modeled using the inelastic force-based frame element type – FB. An inverted triangular lateral force distribution applied to the structural model in each step of the analysis. The evaluation is also performed by analyzing the building using nonlinear dynamic analysis. Ten earthquake records are used in the analysis to cover a wide range of ground motion duration and frequency content. The element mass is assumed to be lumped at the joints, and viscous damping is assumed to be 5%. The mean plus one standard deviation values of the roof-drift ratio, the maximum story drift ratio for the seismic performance evaluations. The results indicate that the performances under pushover static loading and nonlinear dynamic analysis indicated the same results in two programs.
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References
[1]-ECP-201, Egyptian Code for Calculating Loads and Forces in Structural Work and Masonry, Housing and Building National Research Center, Ministry of Housing, Utilities and Urban Planning, Cairo, 2012.
[2]-M.H. Serror, M.M. Hassan, S.A. Mourad, Towards a boundary between special and ordinary steel moment resisting frames in the Egyptian code, in: Proc. of 14th European Conference on Earthquake Engineering, Paper 197, Ohrid, 2010.
[3]-M.A.A. El-Shaer, Effect of earthquake on steel frames with partial rigid connection, J. Eng. Sci., Assiut Univ. 40 (2) (2012) 343–352.
[4]-S. Abdel Raheem, Evaluation of Egyptian code provisions for seismic design of moment-resisting-frame multi-story buildings, Int. J. Adv. Struct. Eng. 5 (2013) 1–20.
[5]-ECP-205: Egyptian Code of Practice for Steel Construction, Load and Resistance Factor Design (LRFD), Housing and Building National Research Center, Ministry of Housing, Utilities and Urban Planning, Cairo, 2008.
[6]-Seism Struct v7.0 –A Computer Program for Static and Dynamic Nonlinear Analysis of Framed Structures, 2014. <http://www.seismosoft.com>.
[7]-Prakash, V., and Powell, G.H., 1992. "DRAIN-2DX user guide" Department of Civil Engineering, University of California, Berkeley, California
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