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RISS 인기검색어
- 검색키워드
- 저자 : Mohammed A. Alhassan (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Concerning the tensor-based flexural formulation: Applications
Mohammed A. Alhassan,Rajai Z. Al-Rousan,Moheldeen A. Hejazi 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.77 No.6
Recently, the plate bending analysis has been interpreted in terms of the tensor’s components of curvatures and bending moments by presenting the conceptual perspectives of the Hydrostatic Method of Analysis (HM) and theoretical formulations that combine the continuum mechanics with the graphical statics analysis, the theory of thin orthotropic and isotropic plates, and the elasticity theory. In pursuance of uncovering a genuine formulation of the plate’s flexural differential equations, that possess the general-covariance and coordinates-independency. This study had then, tackled various natural and structural problems in both solid and fluid branches of the continuum mechanics in a description of such theoretical and conceptual attainment in uncovering the dimensional independent diffeomorphism covariant partial differential laws.
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Impact resistance of polypropylene fiber reinforced concrete two-way slabs
Rajai Z. Al-Rousan,Mohammed A. Alhassan,Harith Al-Salman 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.62 No.3
Concrete structures are often subjected to long-term static and short-term dynamic loads. Due to a relatively low tensile strength and energy dissipating characteristics, the impact resistance of concrete is considered poor. This study investigates the feasibility of using polypropylene fibers to improve the impact resistance of reinforced concrete slabs. Fourteen polypropylene fiber reinforced concrete slabs were fabricated and tested using a drop weight test. The effects of slab thickness, fiber volume fractions, and impact energy on the dynamic behaviors were evaluated mainly in terms of impact resistant, crack patterns, and failure modes. The post impact induced strains versus time responses were obtained for all slabs. The results showed that adding the polypropylene fiber at a dosage of 0.90% by volume of concrete leads to significant improvement in the overall structural behavior of the slabs and their resistance to impact loading. Interestingly, the enhancement in the behavior of the slabs using a higher fiber dosage of 1.2% was not as good as achieved with 0.90%.
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Novel nonlinear stiffness parameters and constitutive curves for concrete
Rajai Z. Al-Rousan,Mohammed A. Alhassan,Moheldeen A. Hejazi 사단법인 한국계산역학회 2018 Computers and Concrete, An International Journal Vol.22 No.6
Concrete is highly non-linear material which is originating from the transition zone in the form of micro-cracks, governs material response under various loadings. In this paper, the constitutive models published by many researchers have been used to generate novel stiffness parameters and constitutive curves for concrete. Following such linear material formulations, where the energy is conservative during the curvature, and a nonlinear contribution to the concrete has been made and investigated. In which, nonlinear concrete elastic modulus modeling has been developed that is capable-of representing concrete elasticity for grades ranging from 10 to 140 MPa. Thus, covering the grades range of concrete up to the ultra-high strength concrete, and replacing many concrete models that are valid for narrow ranges of concrete strength grades. This has been followed by the introduction of the nonlinear Hooke’s law for the concrete material through the replacement of the Young constant modulus with the nonlinear modulus. In addition, the concept of concrete elasticity index (φ) has been proposed and this factor has been introduced to account for the degradation of concrete stiffness in compression under increased loading as well as the multi-stages micro-cracking behavior of concrete under uniaxial compression. Finally, a sub-routine artificial neural network model has been developed to capture the concrete behavior that has been introduced to facilitate the prediction of concrete properties under increased loading.
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Concerning the tensor-based flexural formulation: Theory
Rajai Z. Al-Rousan,Mohammed A. Alhassan,Moheldeen A. Hejazi 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.70 No.4
Since the days of yore, plate\'s flexural analysis and formulation were dependent on the assumed coordinate system. In uncovering the coordinates-independent flexural interpretation, in this study, the plate bending analysis has been interpreted in terms of the tensor\'s components of curvatures and bending moments, in accordance with the continuum mechanics. The paper herein presents the theoretical formulations and conceptual perspectives of the Hydrostatic Method of Analysis (HM) that combines the continuum mechanics with the elasticity theory; the graphical statics and analysis; the theory of thin isotropic and orthotropic plates.
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