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PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
Effects of Using Low Yield Point Steel instead of Normal Steel in Steel Shear Walls
M.J. Fadaee and B. Bayat
Department of Civil Engineering, Shahid Bahonar University of Kerman, Iran
M.J. Fadaee, B. Bayat, "Effects of Using Low Yield Point Steel instead of Normal Steel in Steel Shear Walls", in B.H.V. Topping, (Editor), "Proceedings of the Eleventh International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 209, 2007. doi:10.4203/ccp.86.209
Keywords: low yield point steel, steel shear wall, post-buckling strength, hysteretic behaviour, ductility.
Investigations of steel shear walls confirm their positive effect against lateral load such as wind and earthquakes. This lateral load bearing system has many advantages such as ductility, high energy damping capacity and decreasing the building dead load which results in a decrease in the earthquake forces.
This paper focuses on the shear walls having plates made of low yield point (LYP) steel. Comparing the plate made of LYP steel with the plate made of normal steel, the first one enters a plastic stage more rapidly relative to its surrounding frame, and therefore, absorbs the earthquake energy significantly. On the other hand, when equal lateral load bearing capacities are expected from both types of the plates, the thickness of the plate made of LYP steel must be increased by the ratio of normal steel yield stress to LYP steel yield stress. Hence, the plate with increased thickness buckles under higher stress.
For analysis of the steel shear walls with finite element method, ANSYS software has been used. In this paper, the effects of the type of the steel, the thickness of the plate and, the aspect ratio of the panel on the hysteretic behaviour of the steel shear wall have been investigated. For this aim a one-storey, one-bay panel for both types of steel has been modelled and analyzed and the hysteretic curves are compared.
Using LYP steel in panels increases the stiffness and energy dissipation of the steel shear walls. It is evident that the cost and seismic behaviour of the steel shear wall made of LYP steel can be improved by optimizing the thickness and aspect ratio for the plate.
The other important point is that, in the case of using normal steel, when the dimensions of the panel are large the in-plane stiffness of the plate is large as well, so, the plate remains at an elastic stage during the applied displacements. In the other words, it displaces a fraction and does not enter the nonlinear stage. As a result, the hysteretic curves become slender and dissipates low amount of energy. It means the whole capacity of the plate is not used in the case of using normal steel. On the contrary, LYP steel in smaller displacements yields and enters the nonlinear stage and so, dissipates a higher amount of energy.
The latter conclusion implies that when the panels of the steel shear walls have large dimensions, using LYP steel is much better because their whole capacity participates in bearing lateral forces.
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