Papers by Faris Albermani
Thin-walled Structures, 2011
Yielding shear panel device (YSPD) is a relatively new passive energy dissipation device, which i... more Yielding shear panel device (YSPD) is a relatively new passive energy dissipation device, which is designed to exploit the shear deformation capacity of metallic plates to absorb earthquake energy. YSPD is inexpensive and its simplicity in manufacturing and installation are the key to its possible commercialisation. The current research investigates the development of finite element (FE) models for YSPD using
Procedia Engineering, 2011
Steel Plate Shear Walls (SPSW) have been used as a lateral-load-resisting system in buildings. Wi... more Steel Plate Shear Walls (SPSW) have been used as a lateral-load-resisting system in buildings. With formation of tension fields, unstiffened SPSW possesses good ductility and high energy dissipating capability under cyclic loading. However, large demand is induced to the frame members from panel yielding. For typical frame configurations, very thin panels are often required to limit such demand but sometimes result in construction difficulties. This paper attempts to reduce such demand by introducing perforations to thicker panels. The effect on stiffness and strength is investigated through nonlinear finite element technique. Based on results described in this paper a simple linear reduction function is proposed.
Journal of Constructional Steel Research, 2013
This paper describes an investigation into a metallic energy dissipater designed for earthquake r... more This paper describes an investigation into a metallic energy dissipater designed for earthquake risk mitigation of civil structures. It is called the Perforated Yielding Shear Panel Device (PYSPD). It comprises of a thin perforated diaphragm plate welded inside a short length square hollow section. The device is to be connected in the lateral load resisting system of a structure with the diaphragm plate being in the plane of the building frame. It is a displacement-based device in which energy is dissipated through plastic shear deformation of its perforated diaphragm plate. The PYSPD is a modified version of the previously tested Yielding Shear Panel Device (YSPD). Perforations on the diaphragm plate alleviate demand on supporting elements which reduces undesirable local deformations near the connections. As a result more stable force-displacement hysteresis is obtained. Three patterns of perforations are studied. Finite element models confirm that diagonal tension field develops under shearing action but stress patterns are affected by perforations. Two plate slenderness and three perforation patterns combinations were tested experimentally. Under quasi-static condition, devices with certain plate slenderness produced stable and repeatable force-displacement hysteresis, and achieved large energy dissipation capability. Compared to un-perforated specimens, perforations reduce elastic stiffness and yield strength. Under design displacement it produced a stable hysteretic behavior and endured code requirements against low-cycle fatigue.
Engineering Structures, 2008
This paper summarizes the development of a new steel energy dissipative device designed for earth... more This paper summarizes the development of a new steel energy dissipative device designed for earthquake protection of structures. The Steel Slit Damper (SSD) is fabricated from a standard structural wide-flange section with a number of slits cut from the web, in a vierendeel truss arrangement. The device is a weld-free design, thereby eliminating the uncertainties and difficulties encountered in in situ welding. Energy is dissipated through flexural yielding of the vierendeel’s web members when the device is subjected to inelastic cyclic deformation. The performance of the device was verified by nine tests and the effects of geometrical parameters were investigated. Experiments showed that the device exhibited stable hysteresis with excellent energy dissipation and ductility. The device yielded at small angular distortion and is thus expected to dissipate energy early in an earthquake. The structural characteristics of the device are readily determined from fundamental engineering principles, thus the design can be easily modified or extended to suit particular structural requirements.
Advances in Structural Engineering, 2013
Thin-Walled Structures, Aug 1, 2011
Yielding shear panel device (YSPD) is a relatively new passive energy dissipation device, which i... more Yielding shear panel device (YSPD) is a relatively new passive energy dissipation device, which is designed to exploit the shear deformation capacity of metallic plates to absorb earthquake energy. YSPD is inexpensive and its simplicity in manufacturing and installation are the key to its possible commercialisation. The current research investigates the development of finite element (FE) models for YSPD using a general purpose FE software ANSYS; the modelling procedure is based on the test results obtained from the ...
"The design of liquid-retaining structures involves many decisions to be made by the designer bas... more "The design of liquid-retaining structures involves many decisions to be made by the designer based on rules of thumb, heuristics, judgement, codes of practice and previous experience. Structural design problems are often ill structured and there is a need to develop programming environments that can incorporate engineering judgement along with algorithmic tools. Recent developments in artificial intelligence have made it possible to develop an expert system that can provide expert advice to the user in the selection of design criteria and design parameters. This paper introduces the development of an expert system in the design of liquid-retaining structures using blackboard architecture. An expert system shell, Visual Rule Studio, is employed to facilitate the development of this prototype system. It is a coupled system combining symbolic processing with traditional numerical processing. The expert system developed is based on British Standards Code of Practice BS8007. Explanations are made to assist inexperienced designers or civil engineering students to learn how to design liquid-retaining structures effectively and sustainably in their design practices. The use of this expert system in disseminating heuristic knowledge and experience to practitioners and engineering students is discussed.
Keywords: blackboard architecture; British Standards; expert system; liquid-retaining structures; structural design"
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Papers by Faris Albermani
Keywords: blackboard architecture; British Standards; expert system; liquid-retaining structures; structural design"
Keywords: blackboard architecture; British Standards; expert system; liquid-retaining structures; structural design"