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Influence of Column Base Rigidity on Behavior of Steel Buildings  

권민호 (정회원·경상대학교 공과대학 토목공학과)
박문호 (정회원·경상대학교 공과대학 토목공학과)
장준호 (정회원·계명대학교 공고대학 토목공학과)
박순응 (정회원·경북대학교 공과대학 토목공학과)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.15, no.1, 2002 , pp. 165-172 More about this Journal
Abstract
Generally, the steel rigid frame has been analyzed using finite element analysis tools. While many efforts have been poured into the understanding and accurate prediction for the nonlinear behavior of the columns and beam-columns connections, the base of the columns are modeled as simply hinged or fixed. However, the base of the steel columns practically is neither fixed not hinged. It behaves as semi-rigid. In this paper, the supports of the columns we modeled as semi-rigid and the importance of such approach in moment-resisting columns is evaluated. Two typical buildings designed by the US specification are modeled and analyzed by the finite element based on stiffness method and flexibility method. The column bases of three-story buildings are modeled as rotational springs with a varying degree of stiffness and strength that simulates the semi-rigidity of the base. Depending on the degree of stiffness and strength, the semi-rigidity varies from the hinged to the fixed. Buildings with semi-rigid column bases behaves similarly to the building with fixed bases. It has been numerically observed through the pushover and nonlinear time history analyses that the decrease of the stiffness of the column base induces the rotational demand on the int air beams. an increase of rotation demands on the first store connections and lead to a soft-story mechanists Due often to the construction and environmental effects, undesired reduction of column base stiffness may cause an increase of rotation demands on the first store connections and lead to a soft-story mechanism.
Keywords
column bases; semi-rigid support; steel moment resisting frame; frame analysis;
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  • Reference
1 O. C. Zienkiewicz and R. L. Taylor. The Finite Element Method. Volume 2: Solid and Fluid Mechanics, Dynamics and Non-Linearity, McGraw Hill, 4th edition, 1991
2 M. Fahmy, B. Stojadinovi'c, S. C. Goel, and T. Sokol. “Load path and deformation mechanism of moment-resisting steel column bases”, In Proceedings, Sixth U.S. National Conference on Earthquake Engineering. EERI, 1998
3 ENV : Design of Steel Structures, European Prenorm, Commission of The European Communities, Part 1.1, 1992
4 International Conference of Building Officials, Uniform Building Code, ICBO, Whittier, Calif., 1994
5 O. C. Zienkiewicz and R. L. Taylor. The Finite Element Method. Volume 1 : Basic Formulation and Linear Problems, McGraw Hill, 4th edition, 1989
6 E. Spacone, F. C. Filippou, and F. F. Taucer. 'Fiber beamcolumn model for nonlinear analysis of R/C frames. Part I: Formulation', Earthquake Engineering and Structural Dynamics, 1996, pp.711-725
7 HKS Inc., ABAQUS, ver5.5 User's Manual, 1996
8 T. Hasegawa. 'Influence of strength of column base on seismic damage of steel frames', Annals of the Building Research Institute, 1997
9 SAC Joint Venture. 1997 http://quiver.eerc.berkeley.edu:8080/
10 Hasegawa. 'Inelastic response behavior of beam fractured steel building structure suffered from the 1995 Hyogoken-Nanbu earthquake', Journal of Structural and Cons- truction Engineering, Transactions of the AIJ, August 1997