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Anwar Hossain, K.M.,Wright, H.D. Techno-Press 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.21 No.6
The novel form of composite walling system consists of two skins of profiled steel sheeting with an in-fill of concrete. The behaviour of such walling under in-plane shear is important in order to utilise this system as shear elements in a steel framed building. Steel sheet-concrete interface governs composite action, overall behaviour and failure modes of such walls. This paper describes the finite element (FE) modelling of the shear behaviour of walls with particular emphasis on the simulation of steel-concrete interface. The modelling of complex non-linear steel-concrete interaction in composite walls is conducted by using different FE models. Four FE models are developed and characterized by their approaches to simulate steel-concrete interface behaviour allowing either full or partial composite action. Non-linear interface or joint elements are introduced between steel and concrete to simulate partial composite action that allows steel-concrete in-plane slip or out of plane separation. The properties of such interface/joint elements are optimised through extensive parametric FE analysis using experimental results to achieve reliable and accurate simulation of actual steel-concrete interaction in a wall. The performance of developed FE models is validated through small-scale model tests. FE models are found to simulate strength, stiffness and strain characteristics reasonably well. The performance of a model with joint elements connecting steel and concrete layers is found better than full composite (without interface or joint elements) and other models with interface elements. The proposed FE model can be used to simulate the shear behaviour of composite walls in practical situation.
Behaviour of volcanic pumice based thin walled composite filled columns under eccentric loading
Anwar Hossain, Khandaker M. Techno-Press 2003 Structural Engineering and Mechanics, An Int'l Jou Vol.16 No.1
This paper describes experimental and theoretical investigations on the behaviour of thin walled composite (TWC) filled columns under eccentric loading conditions. Details of the experimental investigation including description of the test columns, testing arrangements, failure modes, strain characteristics, load-deformation responses and effects of various geometric and material parameters are presented. The current paper also introduces the use and effect of lightweight Volcanic Pumice Concrete (VPC) in TWC columns. Analytical models for the design of columns under eccentric loading conditions have been developed taking into consideration the effect of confined concrete. The performance of design equations is validated through experimental results. The proposed design models are found to produce better results compared with available design procedures and Code based formulations. A computer program is developed to generate the interaction diagrams based on the proposed design equations that can be used for design purposes.
Behaviour of composite walls under monotonic and cyclic shear loading
Hossain, K.M. Anwar,Wright, H.D. Techno-Press 2004 Structural Engineering and Mechanics, An Int'l Jou Vol.17 No.1
The novel form of composite walling system consists of two skins of profiled steel sheeting with an in-fill of concrete. Such walling system can be used as shear elements in steel framed building subjected to lateral load. This paper presents the results of small-scale model tests on composite wall and its components manufactured from very thin sheeting and micro-concrete tested under monotonic and cyclic shear loading conditions. The heavily instrumented small-scale tests provided information on the load-deformation response, strength, stiffness, strain condition, sheet-concrete interaction and failure modes. Analytical models for shear strength and stiffness are derived with some modification factor to take into account the effect of quasi-static cycling loading. The performance of design equations is validated through experimental results.
Flexural and shear behaviour of profiled double skin composite elements
K. M. Anwar Hossain,H. D. Wright 국제구조공학회 2004 Steel and Composite Structures, An International J Vol.4 No.2
Double skin composite element (DSCE) is a novel form of construction comprising two skins of profiled steel sheeting with an infill of concrete. DSCEs are thought to be applicable as shear or core walls in a building where they can resist in-plane loads. In this paper, the behaviour of DSCE subjected to combined bending and shear deformation is described. Small-scale model tests on DSCEs manufactured from microconcrete and very thin sheeting were conducted to investigate the flexural and shear behaviour along with analytical analysis. The model tests provided information on the strength, stiffness, strain conditions and failure modes of DSCEs. Detailed development of analytical models for strength and stiffness and their performance validation by model tests are presented.
Khandaker M. Anwar Hossain 사단법인 한국계산역학회 2009 Computers and Concrete, An International Journal Vol.6 No.6
The effect of six different curing conditions on compressive strength and ultrasonic pulse velocity (UPV) of volcanic pumice concrete (VPC) and normal concrete (NC) has been studied. The curing conditions include water, air, low temperature (4℃) and different elevated temperatures of up to 110℃. The curing age varies from 3 days to 91 days. The development in the pulse velocity and the compressive strength is found to be higher in full water curing than the other curing conditions. The reduction of pulse velocity and compressive strength is more in high temperature curing conditions and also more in VPC compared to NC. Curing conditions affect the relationship between pulse velocity and compressive strength of both VPC and NC.
Flexible Smart Home Architecture using Device Profile for Web Services: a Peer-to-Peer Approach
Jorge Parra,M. Anwar Hossain,Abdulmotaleb El Saddik,Aitor Uribarren,Eduardo Jacob 보안공학연구지원센터 2009 International Journal of Smart Home Vol.3 No.2
In this paper we propose the design and development of a flexible smart home architecture using a peer-to-peer (P2P) approach. We specifically focus on two distinct aspects of this proposed architecture. First, we analyze how the different home devices and services can be represented as individual peers in order to have a decentralized system, which is scalable by nature and avoids the single point-of-failure usually attributed to a centralized server. Second, we investigate the distribution of application workflow logic among the peers to develop a flexible home architecture with autonomous behavior of the peers. We analyze the suitability of Devices Profile for Web Services (DPWS) to realize the proposed P2P-like architecture for the smart home. We further show how to distribute the application workflow logic among the peers and yet achieving the same global behavior of the system. Our experimental results show that DPWS provides tools and techniques, in particular its discovery and eventing mechanism, which can be leveraged to provide flexibility and autonomy in the overall architecture.
Efficient Virtual Machine Resource Management for Media Cloud Computing
( Mohammad Mehedi Hassan ),( Biao Song ),( Ahmad Almogren ),( M. Shamim Hossain ),( Atif Alamri ),( Mohammed Alnuem ),( Muhammad Mostafa Monowar ),( M. Anwar Hossain ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.5
Virtual Machine (VM) resource management is crucial to satisfy the Quality of Service (QoS) demands of various multimedia services in a media cloud platform. To this end, this paper presents a VM resource allocation model that dynamically and optimally utilizes VM resources to satisfy QoS requirements of media-rich cloud services or applications. It additionally maintains high system utilization by avoiding the over-provisioning of VM resources to services or applications. The objective is to 1) minimize the number of physical machines for cost reduction and energy saving; 2) control the processing delay of media services to improve response time; and 3) achieve load balancing or overall utilization of physical resources. The proposed VM allocation is mapped into the multidimensional bin-packing problem, which is NP-complete. To solve this problem, we have designed a Mixed Integer Linear Programming (MILP) model, as well as heuristics for quantitatively optimizing the VM allocation. The simulation results show that our scheme outperforms the existing VM allocation schemes in a media cloud environment, in terms of cost reduction, response time reduction and QoS guarantee.