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RISS 인기검색어
- 검색키워드
- 저자 : Salah U. Al-Dulaijan (검색결과 3 건)
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Al-Dulaijan, Salah U.,Azeez, Mukhtar Oluwaseun,Ahmad, Shamsad,Maslehuddin, Mohammed Techno-Press 2021 Advances in concrete construction Vol.12 No.1
Heavyweight concrete having unit weight above 2600 kg/m<sup>3</sup> has wide applications that include radiation shielding, offshore, and ballasting of pipelines, etc. In this study, high-performance heavyweight concrete mixtures were developed utilizing industrial byproducts as high-density coarse aggregates. These heavyweight coarse aggregates included steel slag, steel shots, and iron ore. Normal-weight limestone aggregate was also used in the control mixture and for partially replacing the heavyweight aggregates in some of the mixtures. Considering different combinations of coarse aggregates, a total of nineteen concrete mixtures with same water/cement ratio and cement content were prepared and tested for evaluating their performance in terms of different engineering properties. Except the control mixture containing normal-weight limestone aggregate, all eighteen heavyweight concrete mixtures considered in the present work, achieved unit weight (dry density) in the acceptable range of 2600 to 3563 kg/m<sup>3</sup>. Most of the heavyweight concrete mixtures attained compressive strength either close to or more than 40 MPa, splitting tensile strength and modulus of elasticity above the minimum acceptable limits, drying shrinkage below permissible value, and high resistance against reinforcement corrosion as indicated by their high electrical resistivity and low chloride diffusion coefficient. The experimental data generated under the present work can be utilized to select optimum mixtures of heavyweight concrete satisfying the service conditions.
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Saeed I. Tahir,Abdelouahed Tounsi,Abdelbaki Chikh,Mohammed A. Al-Osta,Salah U. Al-Dulaijan,Mesfer M. Al-Zahrani 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.42 No.4
Earthquake Resistant Design Philosophy seeks (a) no damage, (b) no significant structural damage, and (c) significant structural damage but no collapse of normal buildings, under minor, moderate and severe levels of earthquake shaking, respectively. A procedure is proposed for seismic design of low-rise reinforced concrete special moment frame buildings, which is consistent with this philosophy; buildings are designed to be ductile through appropriate sizing and reinforcement detailing, such that they resist severe level of earthquake shaking without collapse. Nonlinear analyses of study buildings are used to determine quantitatively (a) ranges of design parameters required to assure the required deformability in normal buildings to resist the severe level of earthquake shaking, (b) four specific limit states that represent the start of different structural damage states, and (c) levels of minor and moderate earthquake shakings stated in the philosophy along with an extreme level of earthquake shaking associated with the structural damage state of no collapse. The four limits of structural damage states and the three levels of earthquake shaking identified are shown to be consistent with the performance-based design guidelines available in literature. Finally, nonlinear analyses results are used to confirm the efficacy of the proposed procedure.
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Ismail M. Mudhaffar,Abdelbaki Chikh,Abdelouahed Tounsi,Mohammed A. Al-Osta,Mesfer M. Al-Zahrani,Salah U. Al-Dulaijan 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.86 No.2
This work applies a four-known quasi-3D shear deformation theory to investigate the bending behavior of a functionally graded plate resting on a viscoelastic foundation and subjected to hygro-thermo-mechanical loading. The theory utilizes a hyperbolic shape function to predict the transverse shear stress, and the transverse stretching effect of the plate is considered. The principle of virtual displacement is applied to obtain the governing differential equations, and the Navier method, which comprises an exponential term, is used to obtain the solution. Novel to the current study, the impact of the viscoelastic foundation model, which includes a time-dependent viscosity parameter in addition to Winkler’s and Pasternak parameters, is carefully investigated. Numerical examples are presented to validate the theory. A parametric study is conducted to study the effect of the damping coefficient, the linear and nonlinear loadings, the power-law index, and the plate width-tothickness ratio on the plate bending response. The results show that the presence of the viscoelastic foundation causes an 18% decrease in the plate deflection and about a 10% increase in transverse shear stresses under both linear and nonlinear loading conditions. Additionally, nonlinear loading causes a one-and-a-half times increase in horizontal stresses and a nearly two-times increase in normal transverse stresses compared to linear loading. Based on the article’s findings, it can be concluded that the viscosity effect plays a significant role in the bending response of plates in hygrothermal environments. Hence it shall be considered in the design.
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