Ben Abdallah Medjdoubi, Mohammed Sid Ahmed Houari, Mohamed Sadoun, Aicha Bessaim, Ahmed Amine Daikh, Mohamed-Ouejdi Belarbi, Abdelhak Khechai, Aman Garg and Mofareh Hassan Ghazwani
Abstract
This article presents a new analytical model to study the effect of porosity on the shear correction factors (SCFs) of functionally graded porous beams (FGPB). For this analysis, uneven and logarithmic-uneven porosity functions are adopted to be distributed through the thickness of the FGP beams. Critical to the application of this theory is a determination of the correction factor, which appears as a coefficient in the expression for the transverse shear stress resultant; to compensate for the assumption that the shear strain is uniform through the depth of the crosssection. Using the energy equivalence principle, a general expression is derived from the static SCFs in FGPB. The resulting expression is consistent with the variationally derived results of Reissner's analysis when the latter are reduced from the two-dimensional case (plate) to the one-dimensional one (beam). A convenient algebraic form of the solution is presented and new study cases are given to illustrate the applicability of the present formulation. Numerical results are presented to illustrate the effect of the porosity distribution on the (SCFs) for various FGPBs. Further, the law of changing the mechanical properties of FG beams without porosity and the SCFare numerically validated by comparison with some available results.
Address
Ben Abdallah Medjdoubi, Mohammed Sid Ahmed Houari, Mohamed Sadoun, Aicha Bessaim: Laboratoire d'Etude des Structures et de Mécanique des Matériaux, Département de Génie Civil,
Faculté des Sciences et de la Technologie, Université Mustapha Stambouli, Mascara 29 000, Algérie
Ahmed Amine Daikh: Laboratoire d'Etude des Structures et de Mécanique des Matériaux, Département de Génie Civil,
Faculté des Sciences et de la Technologie, Université Mustapha Stambouli, Mascara 29 000, Algérie; Department of Technology, University Centre of Naama, P.O. Box 66, 45000 Naama, Algeria
Mohamed-Ouejdi Belarbi, Abdelhak Khechai: Laboratoire de Recherche en Génie Civil, LRGC, Université de Biskra, B.P. 145, R.P. 07000, Biskra, Algeria
Aman Garg: Department of Civil and Environmental Engineering, The NorthCap University, Gurugram, Haryana, 122017, India
Mofareh Hassan Ghazwani: Department of Mechanical Engineering, Jazan University, P.O. Box 114, Jazan, 45142, Saudi Arabia
Abstract
In our research, we have proposed a solid solution for aviation analysis which can ensure the asymptotic
stability of coupled nonlinear plants, according to the theoretical solutions and demonstrated method. Because this
solution employed the scheme of specific novel theorem of control, the controllers are artificially combined by the
parallel distribution computation to have a feasible solution given the random coupled systems with aviation stability analysis. Therefore, we empathize and manually derive the results which shows the utilized lemma and criterion are believed effective and efficient for aircraft structural analysis of composite and nonlinear scenarios. To be fair, the experiment by numerical computation and calculations were explained the perfectness of the methodology we provided in the research.
Key Words
aviation vehicles; inequality controlling & nonlinear stability analysis; linear matrix; spacecraft
Address
C.C. Hung: Faculty of National Hsin Hua Senior High School, Tainan, Taiwan
T. Nguyễn: Ha Tinh University, Dai Nai Campus: No. 447, Street 26/3, Dai Nai Ward, Ha Tinh City, Vietnam
Abstract
The objective of this study is to evaluate the effects of adding fibers to concrete and the distribution rate of the porosity on the interfacial stresses of the beams strengthened with various types of functionally graded porous (FGP) plate. Toward this goal, the beams strengthened with FGP plate were considered and subjected to uniform loading. Three types of beams are considered namely RC beam, RC beam reinforced with metal fibers (RCFM) and RC beam reinforced with Alfa fibers (RCFA). From an analytical development, shear and normal interfacial stresses along the length of the FGP plates were obtained. The accuracy and validity of the proposed theoretical formula are confirmed by the others theoretical results. The results showed clearly that adding fibers to concrete and the distribution rate of the porosity have significant influence on the interfacial stresses of the beams strengthened with FGP plates. Finally, parametric studies are carried out to demonstrate the effect of the mechanical properties and thickness variations of FGP plate, concrete and adhesive on interface debonding, we can conclude that, This research is helpful for the understanding on mechanical behavior of the interface and design of the FRP-RC hybrid structures.
Key Words
distribution rate of porosity; FGP plates; interfacial stresses; RC beams; shear lag effect
Address
Benferhat Rabia, Tahar Hassaine Daouadji and Rabahi Abderezak: Civil Engineering Department, University of Tiaret, Algeria; Laboratory of Geomatics and Sustainable Development, University of Tiaret, Algeria
Abstract
This article is an application of new modified couple stress thermoelasticity without energy dissipation in association with two-temperature theory. The upper and lower surfaces of the plate are subjected to an axisymmetric heat supply. The solution is found by using Laplace and Hankel transform techniques. The analytical expressions of displacement components, conductive temperature, stress components and couple stress are computed in transformed domain. Numerical inversion technique has been applied to obtain the results in the physical domain. Numerically simulated results are depicted graphically. The effect of two temperature is shown on the various components.
Key Words
concentrated and distributed source; Hankel transform; Laplace transform; new modified couple stress; thermoelastic; transversely isotropic
Address
Parveen Lata and Harpreet Kaur: Department of Basic and Applied Sciences, Punjabi University, Patiala, Punjab, India
Abstract
Unsymmetrical high-rise buildings (HRBs) subjected to earthquake represent a difficult challenge to structural engineering, especially taking into consideration the effect of soil-structure interaction (SSI). L-shape in plan HRBs suffer from big straining actions when are subjected to an earthquake (in x- or y-direction, or both x- and y- directions). Additionally, the disastrous effect of seismic pounding may appear between two adjacent unsymmetrical HRBs. For two unsymmetrical L-shape in plan HRBs subjected to earthquake in three different direction cases (x, y, or both), including the SSI effect, different methods are investigated to mitigate the seismic pounding and thus protect these types of structures under the earthquake effect. The most effective technique to mitigate the seismic pounding and help in seismically protecting these adjacent HRBs is found herein to be the use of a combination of pounding tuned mass dampers (PTMDs) all over the height (at the connection points) together with tuned mass dampers (TMDs) on the top of both buildings.
Key Words
building vibration control; finite element method (FEM); high-rise building (HRB); irregular building; L-shape in plan building; nonlinear time history analysis; pounding tuned mass damper (PTMD); soil-structure interaction (SSI); tuned mass damper (TMD); unsymmetrical in plan building
Address
Ahmed Abdelraheem Farghaly: Department of Civil and Architectural Constructions, Faculty of Technology and Education, Sohag University, Sohag, 82524, Egypt
Denise-Penelope N. Kontoni: Department of Civil Engineering, School of Engineering, University of the Peloponnese, GR-26334 Patras, Greece; School of Science and Technology, Hellenic Open University, GR-26335 Patras, Greece
