Design of laterally restrained web-tapered steel structures through a stiffness reduction method

2018 ◽  
Vol 141 ◽  
pp. 63-76 ◽  
Author(s):  
Merih Kucukler ◽  
Leroy Gardner
Keyword(s):  
Reduction Method ◽  
Steel Structures ◽  
Stiffness Reduction

scholarly journals Structural Analysis of Steel Structures under Fire Loading

10.14311/1083 ◽  
2009 ◽  
Vol 49 (1) ◽  
Author(s):  
C. Crosti
Keyword(s):  
Finite Element ◽  
Structural Analysis ◽  
Steel Structure ◽  
Steel Structures ◽  
Global Behavior ◽  
Fire Load ◽  
Stiffness Reduction ◽  
Fire Loading ◽  
The Right ◽  
Real Building

This paper focuses on the structural analysis of a steel structure under fire loading. In this framework, the objective is to highlight the importance of the right choice of analyses to develop, and of the finite element codes able to model the resistance and stiffness reduction due to the temperature increase. In addition, the evaluation of the structural collapse under fire load of a real building is considered, paying attention to the global behavior of the structure itself. 

A Stiffness Reduction Method for efficient absorption of waves at boundaries for use in commercial Finite Element codes

Ultrasonics ◽  
2014 ◽  
Vol 54 (7) ◽  
pp. 1868-1879 ◽  
Author(s):  
J.R. Pettit ◽  
A. Walker ◽  
P. Cawley ◽  
M.J.S. Lowe
Keyword(s):  
Finite Element ◽  
Reduction Method ◽  
Stiffness Reduction

A new generalized stiffness reduction method for 2D/2.5D frequency-domain seismic wave modeling in viscoelastic anisotropic media

Geophysics ◽  
2020 ◽  
Vol 85 (6) ◽  
pp. T315-T329
Author(s):  
Qingjie Yang ◽  
Bing Zhou ◽  
Mohamed Kamel Riahi ◽  
Mohammad Al-khaleel
Keyword(s):  
Free Surface ◽  
Frequency Domain ◽  
Seismic Wave ◽  
Reduction Method ◽  
Numerical Solutions ◽  
Anisotropic Media ◽  
Spectral Element ◽  
Wave Modeling ◽  
Adaptation Capacity ◽  
Stiffness Reduction

In frequency-domain seismic wave modeling, absorbing artificial reflections is crucial to obtain accurate numerical solutions. We have determined that, in viscoelastic anisotropic media (VEAM), the most popular absorbing boundary techniques, such as the perfectly matched layer and the generalized stiffness reduction method (GSRM), fail. Then, we develop a new version of the GSRM and incorporate it into a 2D/2.5D spectral element method. We find with extensive nontrivial numerical experiments that the new GSRM exhibits excellent features of simple and efficient implementation, while handling free-surface and subsurface interface topography. Furthermore, we find that sampling the positive wavenumber range is an efficient strategy to compute the 3D wavefield in arbitrary 2D VEAM, and the new version takes full advantage of the symmetry/antisymmetry of the wavefield. The new GSRM removes artificial reflections by damping the real and imaginary viscoelastic moduli in different ways. The wavefields in two vertically transverse isotropic and one orthorhombic viscoelastic homogeneous models are compared with the corresponding analytical solutions to show the high accuracy performance of the new GSRM. Finally, a complex 2D geologic model with irregular free-surface and subinterface is considered to present the modeling technique and its adaptation capacity for complex 2D VEAM.

On the effect of reduced boundary elements in steel shear walls

2017 ◽  
Vol 8 (1) ◽  
pp. 2-24
Author(s):  
Sayed Behzad Talaeitaba ◽  
Hamed Esmaeili ◽  
Mohammad Ebrahim Torki
Keyword(s):  
Load Capacity ◽  
Shear Walls ◽  
Steel Structures ◽  
Boundary Elements ◽  
Reduced Form ◽  
Base Shear ◽  
Ultimate Load Capacity ◽  
Content Type ◽  
Local Boundary ◽  
Stiffness Reduction

Purpose Steel shear walls have recently received exclusive remark. Respective of most building code requirements, design of shear wall vertical boundary elements (VBEs) and local boundary elements (LBEs) against web yielding triggers exaggerated stiffness. The extent of stiffness reduction effects in boundary elements thus calls for more exhaustive investigation. The paper aims to discuss these issues. Design/methodology/approach To this end, FEM-based push-over curves demonstrating base shear vs roof displacement, and von Mises plastic strains were scrutinized in half-scale and full-size models. Analyses were in perfect conformity with experimental data. Findings With reference to the AISC requirement, up to 35 percent decrease in the VBE moments of inertia could be imparted in higher levels without the ultimate load capacity nor displacement to failure being reduced. Also considered was open shear walls with reduced or minimum-design LBEs, the latter being used in continuous or abridged form. LBEs could be used with a moment of inertia 80 percent smaller than required if only used in a continuous form. The effect due to opening geometry was negligible on loading capacity but distinguished on the post-yielding buckling-induced softening. Practical implications Light-weight design of low- to medium-level steel structures against earthquake loads. Originality/value With respect to continuous walls, the results are more comprehensive than those existing in the literature in that they combine the effects due to scale and orientation (horizontal or vertical) of boundary elements. The results for open shear walls are not only comprehensive but also original in a sense that they account for the influences induced by the opening type (door or window), orientation (horizontal or vertical), and design (full-length or abridged) of boundary elements, in reduced form, on the lateral stiffness of the frame.

Sign in / Sign up

Export Citation Format

Share Document