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Nonlinear seismic assessment of steel moment frames under bidirectional loading via endurance time method
, Article Structural Design of Tall and Special Buildings ; Vol. 23, issue. 6 , April , 2014 , p. 442-462 ; ISSN: 15417794 ; Estekanchi, H. E ; Sharif University of Technology
Abstract
In this paper, considering horizontal components of seismic excitation, an algorithm for the nonlinear multi-component analysis of building structures by the Endurance Time (ET) method is proposed, and results of the ET method for various steel moment frames with one to seven stories are verified by comparing with the results from Nonlinear Time History Analysis with use of two different sets of ground motions. In addition, several parameters such as eccentricities and irregularities in structure, rotational and lateral stiffness, effect of hysteresis type and ductility have been considered for sensitivity analysis on results, obtained by ET method. Results show that on the basis of...
Interaction curves for in-plane and out-of-plane behaviors of unreinforced masonry walls
, Article Journal of Earthquake Engineering ; Volume 19, Issue 1 , 2015 , Pages 60-84 ; 13632469 (ISSN) ; Aref, A. J ; Whittaker, A. S ; Sharif University of Technology
Taylor and Francis Ltd
2015
Abstract
Different types of macro-elements have been proposed to simulate the behavior of unreinforced masonry (URM) structures under seismic loads. In many of these, macro-elements URM walls are replaced with beam elements with different hysteretic behaviors. The effect of out-of-plane loading or change of gravity load due to the overturning moment is usually not considered in the behavior of these macro-elements. This article presents interaction curves for bidirectional loadings of unreinforced masonry walls to investigate the importance of these factors. Two parameters are systematically changed to derive the interaction curves for a wall with specific dimensions, including compressive traction...