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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Structural Engineering and Mechanics
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Volume & Issues
Volume 52, Issue 6 - Dec 2014
Volume 52, Issue 5 - Dec 2014
Volume 52, Issue 4 - Nov 2014
Volume 52, Issue 3 - Nov 2014
Volume 52, Issue 2 - Oct 2014
Volume 52, Issue 1 - Oct 2014
Volume 51, Issue 6 - Sep 2014
Volume 51, Issue 5 - Sep 2014
Volume 51, Issue 4 - Aug 2014
Volume 51, Issue 3 - Aug 2014
Volume 51, Issue 2 - Jul 2014
Volume 51, Issue 1 - Jul 2014
Volume 50, Issue 6 - Jun 2014
Volume 50, Issue 5 - Jun 2014
Volume 50, Issue 4 - May 2014
Volume 50, Issue 3 - May 2014
Volume 50, Issue 2 - Apr 2014
Volume 50, Issue 1 - Apr 2014
Volume 49, Issue 6 - Mar 2014
Volume 49, Issue 5 - Mar 2014
Volume 49, Issue 4 - Feb 2014
Volume 49, Issue 3 - Feb 2014
Volume 49, Issue 2 - Jan 2014
Volume 49, Issue 1 - Jan 2014
Selecting the target year
Structural behaviors of sustainable hybrid columns under compression and flexure
Wu, Xiang-Guo ; Hu, Qiong ; Zou, Ruofei ; Zhao, Xinyu ; Yu, Qun ;
Structural Engineering and Mechanics, volume 52, issue 5, 2014, Pages 857~873
DOI : 10.12989/sem.2014.52.5.857
Structural behaviors of a sustainable hybrid column with the ultra high performance cementitious composites (UHPCC) permanent form under compression and flexure were studied. Critical state and failure stage characters are analyzed for large and small eccentricity cases. A simplified theoretical model is proposed for engineering designs and unified formulas for loading capacity of the hybrid column under compression and flexure loads are derived, including axial force and moment. Non-linear numerical analysis is carried out to verify the theoretical predictions. The theoretical predictions agree well with the numerical results which are verified by the short hybrid column tests recursively. Compared with the traditional reinforced concrete (RC) column, the loading capacity of the sustainable hybrid column is improved significantly due to UHPCC confinements.
Shaking table experiment on a steel storage tank with multiple friction pendulum bearings
Zhang, Ruifu ; Weng, Dagen ; Ge, Qingzi ;
Structural Engineering and Mechanics, volume 52, issue 5, 2014, Pages 875~887
DOI : 10.12989/sem.2014.52.5.875
The aim of the shaking table experiment is to verify the isolation effect of a storage liquid tank with multiple friction pendulum bearings. A 1:20 scale model of a real storage liquid tank that is widely used in the petroleum industry was examined by the shaking table test to compare its anchored base and isolated base. The seismic response of the tank was assessed by employing the time history input. The base acceleration, wave height and tank wall stress were used to evaluate the isolation effect. Finally, the influences of the bearing performance that characterizes the isolated tank, such as the friction force and residual displacement, were discussed.
Very long life fatigue behaviors of 16Mn steel and welded joint
Liu, Yongjie ; He, Chao ; Huang, Chongxiang ; Khan, Muhammad K. ; Wang, Qingyuan ;
Structural Engineering and Mechanics, volume 52, issue 5, 2014, Pages 889~901
DOI : 10.12989/sem.2014.52.5.889
Very long life fatigue tests were carried out on 16Mn steel base metal and its welded joint by using the ultrasonic fatigue testing technique. Specimen shapes (round and plate) were considered for both the base metal and welded joint. The results show that the specimens present different S-N curve characteristics in the region of
cycles. The round specimens showed continuously decreasing tendency while plate specimens showed a steep decreasing step and an asymptotic horizontal one. The fatigue strength of round specimen was found higher than plate specimen. The fatigue strength of as-welded joint was 45.0% of the base material for butt joint and 40% for cruciform as-welded joint. It was found that fracture can still occur in butt joint beyond
cycles. The cruciform joint has a fatigue limit in the very long life fatigue regime (
cycles). Fatigue strength of butt as-welded joint was much higher as compared to cruciform as-welded joint. Improvement in fatigue strength of welded joint was found due to UPT. The observation of fracture surface showed crack mainly initiated from welded toe at fusion areas or geometric discontinuity sites at the surface in butt joint and from welded toe in cruciform joint.
Feedback control design for intelligent structures with closely-spaced eigenvalues
Cao, Zongjie ; Lei, Zhongxiang ;
Structural Engineering and Mechanics, volume 52, issue 5, 2014, Pages 903~918
DOI : 10.12989/sem.2014.52.5.903
Large space structures may have resonant low eigenvalues and often these appear with closely-spaced natural frequencies. Owing to the coupling among modes with closely-spaced natural frequencies, each eigenvector corresponding to closely-spaced eigenvalues is ill-conditioned that may cause structural instability. The subspace to an invariant subspace corresponding to closely-spaced eigenvalues is well-conditioned, so a method is presented to design the feedback control law of intelligent structures with closely-spaced eigenvalues in this paper. The main steps are as follows: firstly, the system with closely-spaced eigenvalues is transformed into that with repeated eigenvalues by the spectral decomposition method; secondly, the computation for the linear combination of eigenvectors corresponding to repeated eigenvalues is obtained; thirdly, the feedback control law is designed on the basis of the system with repeated eigenvalues; fourthly, the system with closely-spaced eigenvalues is regarded as perturbed system on the basis of the system with repeated eigenvalues; finally, the feedback control law is applied to the original system, the first order perturbations of eigenvalues are discussed when the parameter modifications of the system are introduced. Numerical examples are given to demonstrate the application of the present method.
Shape control of cable structures considering concurrent/sequence control
Shon, Sudeok ; Kwan, Alan S. ; Lee, Seungjae ;
Structural Engineering and Mechanics, volume 52, issue 5, 2014, Pages 919~935
DOI : 10.12989/sem.2014.52.5.919
In this study, the control of the shape of pre-stressed cable structures and the effective control element were examined. The process of deriving the displacement control equations using the force method was explained, and the concurrent control scheme (CCS) and the sequence control scheme (SCS) were proposed. To explain the control scheme process, the quadrilateral cable net model was adopted and classified into a regular model and an irregular model for the analysis of the control results. In the control analysis of the regular model, the CCS and SCS analysis results proved reliable. For the SCS, the errors occur in the control stage and varied according to the control sequence. In the control analysis of the irregular model, the CCS analysis result also proved relatively reliable, and the SCS analysis result with the correction of errors in each stage was found nearly consistent with the target shape after the control. Finally, to investigate an effective control element, the Geiger cable dome was adopted. A set of non-redundant elements was evaluated in the reduced row echelon form of a coefficient matrix of control equations. Important elements for shape control were also evaluated using overlapping elements in the element sets, which were selected based on cable adjustments.
Analysis of an electrically actuated fractional model of viscoelastic microbeams
Bahraini, Seyed Masoud Sotoodeh ; Eghtesad, Mohammad ; Farid, Mehrdad ; Ghavanloo, Esmaeal ;
Structural Engineering and Mechanics, volume 52, issue 5, 2014, Pages 937~956
DOI : 10.12989/sem.2014.52.5.937
The MEMS structures usually are made from silicon; consideration of the viscoelastic effect in microbeams duo to the phenomena of silicon creep is necessary. Application of the fractional model of microbeams made from viscoelastic materials is studied in this paper. Quasi-static and dynamical responses of an electrically actuated viscoelastic microbeam are investigated. For this purpose, a nonlinear finite element formulation of viscoelastic beams in combination with the fractional derivative constitutive equations is elucidated. The four-parameter fractional derivative model is used to describe the constitutive equations. The electric force acting on the microbeam is introduced and numerical methods for solving the nonlinear algebraic equation of quasi-static response and nonlinear equation of motion of dynamical response are described. The deflected configurations of a microbeam for different purely DC voltages and the tip displacement of the microbeam under a combined DC and AC voltages are presented. The validity of the present analysis is confirmed by comparing the results with those of the corresponding cases available in the literature.
Effects of Constrained Groove Pressing (CGP) on the plane stress fracture toughness of pure copper
Mohammadi, Bijan ; Tavoli, Marzieh ; Djavanroodi, Faramarz ;
Structural Engineering and Mechanics, volume 52, issue 5, 2014, Pages 957~969
DOI : 10.12989/sem.2014.52.5.957
Among severe plastic deformation methods, groove pressing is one of the prominent techniques for producing ultra-fine grained sheet materials. This process consists of imposing repetitive severe plastic deformation on the plate or sheet metals through alternate pressing. In the current study, a 2 mm pure Cu sheet has been subjected to repetitive shear deformation up to two passes. Hardness and tensile yield and ultimate stress were obtained after groove pressing. Fracture toughness tests have been performed and compared for three conditions of sheet material namely as received (initial annealed state), after one and two passes of groove pressing. Results of experiments indicate that a decrease in the values of fracture toughness attains as the number of constrained groove pressing (CGP) passes increase.
Buckling analysis of semi-rigid connected and partially embedded pile in elastic soil using differential transform method
Catal, Seval ;
Structural Engineering and Mechanics, volume 52, issue 5, 2014, Pages 971~995
DOI : 10.12989/sem.2014.52.5.971
The parts of semi-rigid connected and partially embedded piles in elastic soil, above the soil and embedded in the soil are called the first region and second region, respectively. The upper end of the pile in the first region is supported by linear-elastic rotational spring. The forth order differential equations of both region for critical buckling load of partially embedded and semi-rigid connected pile with shear deformation are established using small-displacement theory and Winkler hypothesis. These differential equations are solved by differential transform method (DTM) and analytical method and critical buckling loads of semirigid connected and partially embedded pile are obtained, results are given in tables and graphs are presented for investigating the effects of relative stiffness of the pile and flexibility of rotational spring.
The modal characteristics of non-uniform multi-span continuous beam bridges
Shi, Lu-Ning ; Yan, Wei-Ming ; He, Hao-Xiang ;
Structural Engineering and Mechanics, volume 52, issue 5, 2014, Pages 997~1017
DOI : 10.12989/sem.2014.52.5.997
According to the structure characteristics of the non-uniform beam bridge, a practical model for calculating the vibration equation of the non-uniform beam bridge is given and the application scope of the model includes not only the beam bridge structure but also the non-uniform beam with added masses and elastic supports. Based on the Bernoulli-Euler beam theory, extending the application of the modal perturbation method and establishment of a semi-analytical method for solving the vibration equation of the non-uniform beam with added masses and elastic supports based is able to be made. In the modal subspace of the uniform beam with the elastic supports, the variable coefficient differential equation that describes the dynamic behavior of the non-uniform beam is converted to nonlinear algebraic equations. Extending the application of the modal perturbation method is suitable for solving the vibration equation of the simply supported and continuous non-uniform beam with its arbitrary added masses and elastic supports. The examples, that are analyzed, demonstrate the high precision and fast convergence speed of the method. Further study of the timesaving method for the dynamic characteristics of symmetrical beam and the symmetry of mode shape should be developed. Eventually, the effects of elastic supports and added masses on dynamic characteristics of the three-span non-uniform beam bridge are reported.
Experimental modal analysis of transverse-cracked rails-influence of the cracks on the real track behavior
Domingo, Laura Montalban ; Giner, Beatriz Baydal ; Martin, Clara Zamorano ; Herraiz, Julia I. Real ;
Structural Engineering and Mechanics, volume 52, issue 5, 2014, Pages 1019~1032
DOI : 10.12989/sem.2014.52.5.1019
Rails are key elements in railway superstructure since these elements receive directly the train load transmitted by the wheels. Simultaneously, rails must provide effective stress transference to the rest of the track elements. This track element often deteriorates as a consequence of the vehicle passing or manufacturing imperfections that cause in rail several defects. Among these rail defects, transverse cracks highlights and are considered a severe pathology because they can suddenly trigger the rail failure. This study is focused on UIC-60 rails with transverse cracks. A 3-D FEM model is developed in ANSYS for the flawless rail in which conditions simulating the crack presence are implemented. To account for the inertia loss of the rail as a consequence of the cracking, a reduction of the bending stiffness of the rail is considered. The numerical models have been calibrated using the first four bending vibration modes in terms of frequencies. These vibration frequencies have been obtained using the Experimental Modal Analysis technique, studying the changes in the modal parameters of the rails induced by the crack and comparing the results obtained by the model with experimental results. Finally, the calibrated and validated models for the single rail have been implemented in a complete railway ballasted track FEM model in order to study the static influence of the cracks on the rail deflection caused by a load passing.
Eigen analysis of functionally graded beams with variable cross-section resting on elastic supports and elastic foundation
Duy, Hien Ta ; Van, Thuan Nguyen ; Noh, Hyuk Chun ;
Structural Engineering and Mechanics, volume 52, issue 5, 2014, Pages 1033~1049
DOI : 10.12989/sem.2014.52.5.1033
The free vibration of functionally graded material (FGM) beams on an elastic foundation and spring supports is investigated. Young`s modulus, mass density and width of the beam are assumed to vary in thickness and axial directions respectively following the exponential law. The spring supports are also taken into account at both ends of the beam. An analytical formulation is suggested to obtain eigen solutions of the FGM beams. Numerical analyses, based on finite element method by using a beam finite element developed in this study, are performed in order to show the legitimacy of the analytical solutions. Some results for the natural frequencies of the FGM beams are given considering the effect of various structural parameters. It is also shown that the spring supports show the greatest effect on the natural frequencies of FGM beams.
Buckling analysis of structures under combined loading with acceleration forces
Wang, Wenjing ; Gu, Randy ;
Structural Engineering and Mechanics, volume 52, issue 5, 2014, Pages 1051~1067
DOI : 10.12989/sem.2014.52.5.1051
The structures of concern in this study are subject to two types of forces: dead loads from the acceleration imposed on the structures as well as the installed operation machines and the additional adjustable forces. We wish to determine the critical values of the adjustable forces when buckling of the structures occurs. The mathematical statement of such a problem gives rise to a constrained eigenvalue problem (CEVP) in which the dominant eigenvalue is subject to an equality constraint. A numerical algorithm for solving the CEVP is proposed in which an iterative method is employed to identify an interval embracing the target eigenvalue. The algorithm is applied to four engineering application examples finding the critical loads of a fixed-free beam subject to its own body force, two plane structures and one wide-flange beam using shell elements when acceleration force is present. The accuracy is demonstrated using the first example whose classical solution exists. The significance of the equality constraint in the EVP is shown by comparing the solutions without the constraint on the eigenvalue. Effectiveness and accuracy of the numerical algorithm are presented.