ORCID Profile
0000-0002-4630-8612
Current Organisations
The University of Auckland
,
Western Sydney University
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Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 07-2017
Publisher: Elsevier BV
Date: 07-2017
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 10-2023
Publisher: American Society of Civil Engineers (ASCE)
Date: 08-2018
Publisher: SAGE Publications
Date: 27-09-2016
Abstract: This article presents a numerical investigation on the web crippling strength of cold-formed stainless steel lipped channel sections with circular web openings under end-one-flange loading condition. In order to take into account the influence of the circular web openings, a parametric study involving 1992 finite element analyses was performed, covering duplex EN1.4462, austenitic EN1.4404 and ferritic EN1.4003 stainless steel grades from the results of the parametric study, strength reduction factor equations are proposed. The web crippling strengths predicted by the reduction factor equations are first compared to the strengths calculated using the equations recently proposed for cold-formed carbon steel lipped channel sections. It is demonstrated that the strength reduction factor equations proposed for cold-formed carbon steel are unconservative for the stainless steel grades by up to 7%. Unified strength reduction factor equations are then proposed that can be applied to all three stainless steel grades.
Publisher: Elsevier BV
Date: 04-2019
Publisher: Elsevier BV
Date: 07-2020
Publisher: Elsevier BV
Date: 10-2020
Publisher: IOP Publishing
Date: 09-10-2020
Abstract: Magneto-rheological (MR) materials and their devices are being rapidly developed and have drawn surge of interest for the potential application in vibration control. Among them, a novel shear-mode rotational MR d er (SM-RMRD) with adaptive variable stiffness and d ing was developed for adaptive structural control in real-time against different types of earthquakes. To make use of this innovative device perfectly, a robust and reliable model should be developed to simulate the nonlinear and hysteretic behaviours for the application in adaptive control. Accordingly, this research initially presents a new phenomenological model to describe the force response of the SM-RMRD. Then, model parameters are estimated based on experimental data of force, displacement and velocity, which were directly or indirectly obtained from the device under different loading protocols. The field dependence of each model parameter is also investigated so that a general model with current-related parameters is acquired for designing the control strategy. Using the current-dependent model of SM-RMRD, a semi-active controller is developed and implemented to the SM-RMRD to produce the feedback control for the structures in real-time. Finally, the effectiveness of proposed control method is appraised by a numerical study, in which an SM-RMRDs-incorporated three-storey building model with different control strategies are subjected to various scaled benchmark earthquakes. The comparison result verifies the excellent capacity of the proposed controller based on the developed phenomenological model in terms of reducing the storey acceleration and inter-storey drift.
Publisher: Elsevier BV
Date: 12-2018
Publisher: SAGE Publications
Date: 09-03-2017
No related grants have been discovered for AMIRMOHAMMAD YOUSEFI.