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Full-Text Articles in Engineering
Nonlinear Finite Element Analysis Of Prestressed Concrete, Akram Shaker Mahmood, Mohamed N. Mahmood
Nonlinear Finite Element Analysis Of Prestressed Concrete, Akram Shaker Mahmood, Mohamed N. Mahmood
Akram Shaker Mahmood
In the present study a nonlinear finite element analysis is carried out on twenty prestressed concrete cantilever beams having different lengths vary from 1.0m to 3.0m with 0.5m increments and subjected to a concentrated torque at the free end using ANSYS V10 finite element package. This study emphasizes on the effect of beam length to depth ratio on the strength, behavior of prestressed concrete beams and effectiveness of prestressing strands in the pre and post cracking stages of loading. This work is part of a PhD research program at the University of Mosul to investigate the non-linear three dimensional behavior …
01june2010_Building Collapse_Begunbari, Md. Nurul Alam
01june2010_Building Collapse_Begunbari, Md. Nurul Alam
Md. Nurul Alam
No abstract provided.
Nonlinear Finite Elements Modeling Of Hybrid Reinforced Concrete Beams, Akram Shaker Mahmood
Nonlinear Finite Elements Modeling Of Hybrid Reinforced Concrete Beams, Akram Shaker Mahmood
Akram Shaker Mahmood
This paper presents results from a nonlinear finite element analysis of a hybrid reinforced concrete rectangular section beams. The concept of hybrid R.C. concrete structures was applied in many designers for using in constructions of bridge superstructure. Although using the steel reinforcements are often modeled as a linear-elastic material until failure, the linear finite element analysis could not predict the behavior of the R.C. concrete beams model up to its failure. The materials, loadings, section properties with boundary conditions are taken from reference [Ref.3]. Results from material tests and loading tests of beams model indicated that the nonlinearity of concrete …
Damage Detection In Wind Turbine Blades Using Time-Frequency Analysis Of Vibration Signals, Breiffni Fitzgerald
Damage Detection In Wind Turbine Blades Using Time-Frequency Analysis Of Vibration Signals, Breiffni Fitzgerald
Breiffni Fitzgerald
The dynamic behaviour of modern multi-Megawatt wind turbines has become an important design consideration. One of the major aspects related to the reliability of operation of the turbines concerns the safe and adequate performance of the blades. The aim of this paper is to develop a time-frequency based algorithm to detect damage in wind turbine blades from blade vibration signals. It is important that damage to blades is detected before they fail or cause the turbine to fail. A wind turbine model was developed for this paper. The parameters considered were the rotational speed of the blades and the stiffness …
Large-Scale Capacitance Sensor For Health Monitoring Of Civil Structures, Simon Laflamme, Matthias Kollosche, Jerome J. Connor, Guggi Kofod
Large-Scale Capacitance Sensor For Health Monitoring Of Civil Structures, Simon Laflamme, Matthias Kollosche, Jerome J. Connor, Guggi Kofod
Simon Laflamme
In this paper, a new type of sensing technique for damage localization on large civil structures is proposed. Specifically, changes in strain are detected using a capacitance sensor built with a soft-stretchable dielectric polymer with attached stretchable metal film electrodes. This sensor is sensitive to a change in strain that causes a change in its capacitance. Fixed to a structure, small changes in the strain can be monitored directly by measuring the change in the capacitance of the unit. This technology allows for simple yet highly accurate measurements of cracks occurring due to deformation, aging, or other structural failures. The …