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Experimental Investigation of “Scale Influence on Plastic Rotational Capacity of Reinforced Concrete Beams”

Engineering（科研） 2016年第4期8卷 196-203页

作者： moh’d el khatieb department of Civil Engineering Zarqa University Zarqa Jordan

The importance of the geometrical effect in practical design has been evaluated, showing that an overestimation of the actual member rotation is very likely if the available rotation capacity is based on the evaluation of the behavior of the reference members within a limited size range. The increase of ductility with decreasing member size has been interpreted in fracture mechanics of reinforced concrete. In fracture mechanics it’s seen that beams with higher dimensions are brittle, while those with small dimensions are ductile, so it’s important here to clarify if the same material and design concepts can be applied for reinforced concrete beams with different scales. Three point bending test was executed on 20 reinforced concrete beams varying scale and slenderness ratio (where steel ratio being kept constant). The experimental results obtained varying beam slenderness and beam depth will be used to analyze the structural response for a practical construction, taking in consideration the size effect, these beams are normally designed in such a way that the distribution of their internal forces over the transversal section has been calculated as per elastic beam theory, while the beam dimension will be designed as per the ultimate limit state to obtain a ductile response of the reinforced concrete beams which is necessary to guarantee the structural safety [1].

关键词： Size Effect Plastic Rotation Reinforced Concrete elastic Beam Theory Fracture Mechanics

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Explicit determination of State Feedback Matrices

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Advances in Pure Mathematics 2015年第7期5卷 403-412页

作者： Omar moh’d el-Basheer el-Ghezawi electrical Engineering department The University of Jordan Amman Jordan

Methods which calculate state feedback matrices explicitly for uncontrollable systems are considered in this paper. They are based on the well-known method of the entire eigenstructure assignment. The use of a particular similarity transformation exposes certain intrinsic properties of the closed loop w-eigenvectors together with their companion z-vectors. The methods are extended further to deal with multi-input control systems. Existence of eigenvectors solution is established. A differentiation property of the z-vectors is proved for the repeated eigenvalues assignment case. Two examples are worked out in detail.

关键词： State Feedback Eigenstructure Assignment Pole Placement Explicit Methods

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Simplified Methods for Eigenvalue Assignment

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Advances in Pure Mathematics 2015年第7期5卷 383-389页

作者： Omar moh’d el-Basheer el-Ghezawi electrical Engineering department The University of Jordan Amman Jordan

A state feedback method of reduced order for eigenvalue assignment is developed in this paper. It offers immediate assignment of m eigenvalues, with freedom to assign the remaining n-m eigenvalues. The method also enjoys a systematic one-step application in the case where the system has a square submatrix. Further simplification is also possible in certain cases. The method is shown to be applicable to uncontrollable systems, offering the simplest control law when having maximum uncontrollable eigenvalues.

关键词： Eigenvalue Assignment Pole Placement Recursive Methods

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