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Structural Engineering and Mechanics
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Volume 60, Issue 2 - Oct 2016
Volume 60, Issue 1 - Oct 2016
Volume 59, Issue 6 - Sep 2016
Volume 59, Issue 5 - Sep 2016
Volume 59, Issue 4 - Aug 2016
Volume 59, Issue 3 - Aug 2016
Volume 59, Issue 2 - Jul 2016
Volume 59, Issue 1 - Jul 2016
Volume 58, Issue 6 - Jun 2016
Volume 58, Issue 5 - Jun 2016
Volume 58, Issue 4 - May 2016
Volume 58, Issue 3 - May 2016
Volume 58, Issue 2 - Apr 2016
Volume 58, Issue 1 - Apr 2016
Volume 57, Issue 6 - Mar 2016
Volume 57, Issue 5 - Mar 2016
Volume 57, Issue 4 - Feb 2016
Volume 57, Issue 3 - Feb 2016
Volume 57, Issue 2 - Jan 2016
Volume 57, Issue 1 - Jan 2016
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Numerical analysis on stability of express railway tunnel portal
Zhou, Xiaojun ; Hu, Hongyun ; Jiang, Bo ; Zhou, Yuefeng ; Zhu, Yong ;
Structural Engineering and Mechanics, volume 57, issue 1, 2016, Pages 1~20
DOI : 10.12989/sem.2016.57.1.001
On the basis of the geological conditions of high and steep mountainous slope on which an exit portal of an express railway tunnel with a bridge-tunnel combination is to be built, the composite structure of the exit portal with a bridge abutment of the bridge-tunnel combination is presented and the stability of the slope on which the express railway portal is to be built is analyzed using three dimensional (3D) numerical simulation in the paper. Comparison of the practicability for the reinforcement of slope with in-situ bored piles and diaphragm walls are performed so as to enhance the stability of the high and steep slope. The safety factor of the slope due to rockmass excavation both inside the exit portal and beneath the bridge abutment of the bridge-tunnel combination has been also derived using strength reduction technique. The obtained results show that post tunnel portal is a preferred structure to fit high and steep slope, and the surrounding rock around the exit portal of the tunnel on the high and steep mountainous slope remains stable when rockmass is excavated both from the inside of the exit portal and underneath the bridge abutment after the slope is reinforced with both bored piles and diaphragm walls. The stability of the high and steep slope is principally dominated by the shear stress state of the rockmass at the toe of the slope; the procedure of excavating rockmass in the foundation pit of the bridge abutment does not obviously affect the slope stability. In-situ bored piles are more effective in controlling the deformation of the abutment foundation pit in comparison with diaphragm walls and are used as a preferred retaining structure to uphold the stability of slope in respect of the lesser time, easier procedure and lower cost in the construction of the exit portal with bridge-tunnel combination on the high and steep mountainous slope. The results obtained from the numerical analysis in the paper can be used to guide the structural design and construction of express railway tunnel portal with bridge-tunnel combination on high and abrupt mountainous slope under similar situations.
Identification of flexible vehicle parameters on bridge using particle filter method
Talukdar, S. ; Lalthlamuana, R. ;
Structural Engineering and Mechanics, volume 57, issue 1, 2016, Pages 21~43
DOI : 10.12989/sem.2016.57.1.021
A conditional probability based approach known as Particle Filter Method (PFM) is a powerful tool for system parameter identification. In this paper, PFM has been applied to identify the vehicle parameters based on response statistics of the bridge. The flexibility of vehicle model has been considered in the formulation of bridge-vehicle interaction dynamics. The random unevenness of bridge has been idealized as non homogeneous random process in space. The simulated response has been contaminated with artificial noise to reflect the field condition. The performance of the identification system has been examined for various measurement location, vehicle velocity, bridge surface roughness factor, noise level and assumption of prior probability density. Identified vehicle parameters are found reasonably accurate and reconstructed interactive force time history with identified parameters closely matches with the simulated results. The study also reveals that crude assumption of prior probability density function does not end up with an incorrect estimate of parameters except requiring longer time for the iterative process to converge.
Axial buckling response of fiber metal laminate circular cylindrical shells
Bidgoli, Ali M. Moniri ; Heidari-Rarani, Mohammad ;
Structural Engineering and Mechanics, volume 57, issue 1, 2016, Pages 45~63
DOI : 10.12989/sem.2016.57.1.045
Fiber metal laminates (FMLs) represent a high-performance family of hybrid materials which consist of thin metal sheets bonded together with alternating unidirectional fiber layers. In this study, the buckling behavior of a FML circular cylindrical shell under axial compression is investigated via both analytical and finite element approaches. The governing equations are derived based on the first-order shear deformation theory and solved by the Navier solution method. Also, the buckling load of a FML cylindrical shell is calculated using linear eigenvalue analysis in commercial finite element software, ABAQUS. Due to lack of experimental and analytical data for buckling behavior of FML cylindrical shells in the literature, the proposed model is simplified to the full-composite and full-metal cylindrical shells and buckling loads are compared with the available results. Afterwards, the effects of FML parameters such as metal volume fraction (MVF), composite fiber orientation, stacking sequence of layers and geometric parameters are studied on the buckling loads. Results show that the FML layup has the significant effect on the buckling loads of FML cylindrical shells in comparison to the full-composite and full-metal shells. Results of this paper hopefully provide a useful guideline for engineers to design an efficient and economical structure.
XFEM for fatigue and fracture analysis of cracked stiffened panels
Kumar, M.R. Nanda ; Murthy, A. Ramachandra ; Gopinath, Smitha ; Iyer, Nagesh R. ;
Structural Engineering and Mechanics, volume 57, issue 1, 2016, Pages 65~89
DOI : 10.12989/sem.2016.57.1.065
This paper presents the development of methodologies using Extended Finite Element Method (XFEM) for cracked unstiffened and concentric stiffened panels subjected to constant amplitude tensile fatigue loading. XFEM formulations such as level set representation of crack, element stiffness matrix formulation and numerical integration are presented and implemented in MATLAB software. Stiffeners of the stiffened panels are modelled using truss elements such that nodes of the panel and nodes of the stiffener coincide. Stress Intensity Factor (SIF) is computed from the solutions of XFEM using domain form of interaction integral. Paris`s crack growth law is used to compute the number of fatigue cycles up to failure. Numerical investigations are carried out to model the crack growth, estimate the remaining life and generate damage tolerant curves. From the studies, it is observed that (i) there is a considerable increase in fatigue life of stiffened panels compared to unstiffened panels and (ii) as the external applied stress is decreasing number of fatigue life cycles taken by the component is increasing.
Effects of Hall current in a transversely isotropic magnetothermoelastic with and without energy dissipation due to normal force
Kumar, Rajneesh ; Sharma, Nidhi ; Lata, Parveen ;
Structural Engineering and Mechanics, volume 57, issue 1, 2016, Pages 91~103
DOI : 10.12989/sem.2016.57.1.091
This investigation is concerned with the disturbances in a homogeneous transversely isotropic thermoelastic rotating medium with two temperature, in the presence of the combined effects of Hall currents and magnetic field due to normal force of ramp type. The formulation is applied to the thermoelasticity theories developed by Green-Naghdi Theories of Type-II and Type-III. Laplace and Fourier transform technique is applied to solve the problem. The analytical expressions of displacements, stress components, temperature change and current density components are obtained in the transformed domain. Numerical inversion technique has been applied to obtain the results in the physical domain. Numerically simulated results are depicted graphically to show the effects of Hall current and anisotropy on the resulting quantities. Some special cases are also deduced from the present investigation.
Vibration of axially moving 3-phase CNTFPC plate resting on orthotropic foundation
Arani, Ali Ghorbanpour ; Haghparast, Elham ; Zarei, Hassan Baba Akbar ;
Structural Engineering and Mechanics, volume 57, issue 1, 2016, Pages 105~126
DOI : 10.12989/sem.2016.57.1.105
In the present study, modelling and vibration control of axially moving laminated Carbon nanotubes/fiber/polymer composite (CNTFPC) plate under initial tension are investigated. Orthotropic visco-Pasternak foundation is developed to consider the influences of orthotropy angle, damping coefficient, normal and shear modulus. The governing equations of the laminated CNTFPC plates are derived based on new form of first-order shear deformation plate theory (FSDT) which is simpler than the conventional one due to reducing the number of unknowns and governing equations, and significantly, it does not require a shear correction factor. Halpin-Tsai model is utilized to evaluate the material properties of two-phase composite consist of uniformly distributed and randomly oriented CNTs through the epoxy resin matrix. Afterwards, the structural properties of CNT reinforced polymer matrix which is assumed as a new matrix and then reinforced with E-Glass fiber are calculated by fiber micromechanics approach. Employing Hamilton`s principle, the equations of motion are obtained and solved by Hybrid analytical numerical method. Results indicate that the critical speed of moving laminated CNTFPC plate can be improved by adding appropriate values of CNTs. These findings can be used in design and manufacturing of marine vessels and aircrafts.
Static and dynamic behavior of FGM plate using a new first shear deformation plate theory
Hadji, Lazreg ; Meziane, M. Ait Amar ; Abdelhak, Z. ; Daouadji, T. Hassaine ; Bedia, E.A Adda ;
Structural Engineering and Mechanics, volume 57, issue 1, 2016, Pages 127~140
DOI : 10.12989/sem.2016.57.1.127
In this paper, a new first shear deformation plate theory based on neutral surface position is developed for the static and the free vibration analysis of functionally graded plates (FGPs). Moreover, the number of unknowns of this theory is the least one comparing with the traditional first-order and the other higher order shear deformation theories. The neutral surface position for a functionally graded plate which its material properties vary in the thickness direction is determined. The mechanical properties of the plate are assumed to vary continuously in the thickness direction by a simple power-law distribution in terms of the volume fractions of the constituents. Based on the present shear deformation plate theory and the neutral surface concept, the governing equations are derived from the principle of Hamilton. There is no stretching-bending coupling effect in the neutral surface based formulation. Numerical illustrations concern flexural and dynamic behavior of FG plates with Metal-Ceramic composition. Parametric studies are performed for varying ceramic volume fraction, length to thickness ratios. The accuracy of the present solutions is verified by comparing the obtained results with the existing solutions.
A hybrid method for dynamic stiffness identification of bearing joint of high speed spindles
Zhao, Yongsheng ; Zhang, Bingbing ; An, Guoping ; Liu, Zhifeng ; Cai, Ligang ;
Structural Engineering and Mechanics, volume 57, issue 1, 2016, Pages 141~159
DOI : 10.12989/sem.2016.57.1.141
Bearing joint dynamic parameter identification is crucial in modeling the high speed spindles for machining centers used to predict the stability and natural frequencies of high speed spindles. In this paper, a hybrid method is proposed to identify the dynamic stiffness of bearing joint for the high speed spindles. The hybrid method refers to the analytical approach and experimental method. The support stiffness of spindle shaft can be obtained by adopting receptance coupling substructure analysis method, which consists of series connected bearing and joint stiffness. The bearing stiffness is calculated based on the Hertz contact theory. According to the proposed series stiffness equation, the stiffness of bearing joint can be separated from the composite stiffness. Then, one can obtain the bearing joint stiffness fitting formulas and its variation law under different preload. An experimental set-up with variable preload spindle is developed and the experiment is provided for the validation of presented bearing joint stiffness identification method. The results show that the bearing joint significantly cuts down the support stiffness of the spindles, which can seriously affects the dynamic characteristic of the high speed spindles.
Design of double dynamic vibration absorbers for reduction of two DOF vibration system
Son, Lovely ; Bur, Mulyadi ; Rusli, Meifal ; Adriyan, Adriyan ;
Structural Engineering and Mechanics, volume 57, issue 1, 2016, Pages 161~178
DOI : 10.12989/sem.2016.57.1.161
This research is aimed to design and analyze the performance of double dynamic vibration absorber (DVA) using a pendulum and a spring-mass type absorber for reducing vibration of two-DOF vibration system. The conventional fixed-points method and genetics algorithm (GA) optimization procedure are utilized in designing the optimal parameter of DVA. The frequency and damping ratio are optimized to determine the optimal absorber parameters. The simulation results show that GA optimization procedure is more effective in designing the double DVA in comparison to the fixed-points method. The experimental study is conducted to verify the numerical result.
An investigation into the influence of thermal loading and surface effects on mechanical characteristics of nanotubes
Ebrahimi, Farzad ; Shaghaghi, Gholam Reza ; Boreiry, Mahya ;
Structural Engineering and Mechanics, volume 57, issue 1, 2016, Pages 179~200
DOI : 10.12989/sem.2016.57.1.179
In this paper the differential transformation method (DTM) is utilized for vibration and buckling analysis of nanotubes in thermal environment while considering the coupled surface and nonlocal effects. The Eringen`s nonlocal elasticity theory takes into account the effect of small size while the Gurtin-Murdoch model is used to incorporate the surface effects (SE). The derived governing differential equations are solved by DTM which demonstrated to have high precision and computational efficiency in the vibration analysis of nanobeams. The detailed mathematical derivations are presented and numerical investigations are performed while the emphasis is placed on investigating the effect of thermal loading, small scale and surface effects, mode number, thickness ratio and boundary conditions on the normalized natural frequencies and critical buckling loads of the nanobeams in detail. The results show that the surface effects lead to an increase in natural frequency and critical buckling load of nanotubes. It is explicitly shown that the vibration and buckling of a nanotube is significantly influenced by these effects and the influence of thermal loadings and nonlocal effects are minimal.