http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Mehdi Ghassemieh (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
Influence of the axial force on the behavior of endplate moment connections
Mehdi Ghassemieh,Iman Shamim,Ali Akbar Gholampour 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.49 No.1
In this article, using finite element method of analysis (FEM), behavior of the endplate moment connection subjected to axial force and bending moment is investigated. In the FEM model, all the nonlinear characteristics such as material, geometry, as well as contact have been included. First, in order to verify the numerical model of the connection, an analysis of the endplate moment connection conducted without the application of the axial force. Results obtained from FEM indicating a close and good correlation with the experimental results. Then to investigate the influence of the axial forces, the connections subjected to axial forces as well as the bending moment are analyzed. To observe the overall effect of these actions, the momentaxial force interaction diagrams are drawn. It is observed that the presence of axial force even in a small value can change the behavior of the connection significantly. It is also shown that the axial forces can alter the failure mode of the connection; and therefore it could result in a different than the predicted moment capacity of the connection.
-
Influence of the axial force on the behavior of endplate moment connections
Ghassemieh, Mehdi,Shamim, Iman,Gholampour, Ali Akbar Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.49 No.1
In this article, using finite element method of analysis (FEM), behavior of the endplate moment connection subjected to axial force and bending moment is investigated. In the FEM model, all the nonlinear characteristics such as material, geometry, as well as contact have been included. First, in order to verify the numerical model of the connection, an analysis of the endplate moment connection conducted without the application of the axial force. Results obtained from FEM indicating a close and good correlation with the experimental results. Then to investigate the influence of the axial forces, the connections subjected to axial forces as well as the bending moment are analyzed. To observe the overall effect of these actions, the momentaxial force interaction diagrams are drawn. It is observed that the presence of axial force even in a small value can change the behavior of the connection significantly. It is also shown that the axial forces can alter the failure mode of the connection; and therefore it could result in a different than the predicted moment capacity of the connection.
-
Extended implicit integration process by utilizing nonlinear dynamics in finite element
Saeed Mohammadzadeh,Mehdi Ghassemieh,박연호 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.64 No.4
This paper proposes a new direct numerical integration algorithm for solving equation of motion in structural dynamics problems with nonlinear stiffness. The new implicit method’s degree of accuracy is higher than that of existing methods due to the higher order of the acceleration. Two parameters are defined, leading to a new family of unconditionally stable methods, which helps to take greater time steps in integration and eliminate concerns about the duration of solving. The method developed can be utilized for a number of solid plane finite elements, examples of which are given to compare the proposed method with existing ones. The results indicate the superiority of the proposed method.
-
Development of Modified Ibarra–Krawinkler Deterioration Model for One-Story Steel Plate Shear Wall
Omid Bamshad,Mehdi Ghassemieh 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.5
Nowadays, steel plate shear wall is considered as a suitable system for conventional lateral load resisting systems, because of high post buckling strength, signifi cant ductility, stable hysteresis characteristics and high initial stiff ness. Although early experimental and analytical research on steel shear wall clarifi ed various aspects of seismic behavior of such system, but still several issues such as deterioration behavior of the system require more investigation on the subject. Like any other structures, in order to investigate the performance of steel plate shear wall (SPSW) comprehensively, its nonlinear behavior should be assessed in a wide range. In this study, based on the modifi ed Ibarra–Krawinkler deterioration model, new equations are proposed in order to provide an acceptable prediction of nonlinear cyclic behavior of one-story SPSWs with hinged-joints. For this purpose, a number of 60 SPSWs were numerically modeled and analyzed and the modifi ed Ibarra– Krawinkler deterioration model parameters were calibrated and pertinent parameters were identifi ed. Then, using statistical regression analysis, the behavioral equations are presented; in which displayed an acceptable level for prediction of cyclic performance of SPSW system.
-
Effect of stiffeners on steel plate shear wall systems
Ahmad Rahmzadeh,Mehdi Ghassemieh,Yeonho Park,Ali Abolmaali 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.20 No.3
Stiffeners have widely been used in lateral load resisting systems to improve the buckling stability of shear panels in steel frames. However, due to major differences between plate girders and steel plate shear walls (SPSWs), use of plate girder equations often leads to uneconomical and, in some cases, incorrect design of stiffeners. Hence, this paper uses finite element analysis (FEA) to describe the effect of the rigidity and arrangement of stiffeners on the buckling behavior of plates. The procedures consider transverse and/or longitudinal stiffeners in various practical configurations. Subsequently, curves and formulas for the design of stiffeners are presented. In addition, the influence of stiffeners on the inward forces subjected to the boundary elements and the tension field angle is investigated as well. The results indicate that the effective application of stiffeners in SPSW systems not only improves the structural behavior, such as stiffness, overall strength and energy absorption, but also leads to a reduction of the forces that are exerted on the boundary elements.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
