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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 14, Issue 6 - Dec 2002
Volume 14, Issue 5 - Nov 2002
Volume 14, Issue 4 - Oct 2002
Volume 14, Issue 3 - Sep 2002
Volume 14, Issue 2 - Aug 2002
Volume 14, Issue 1 - Jul 2002
Volume 13, Issue 6 - Jun 2002
Volume 13, Issue 5 - May 2002
Volume 13, Issue 4 - Apr 2002
Volume 13, Issue 3 - Mar 2002
Volume 13, Issue 2 - Feb 2002
Volume 13, Issue 1 - Jan 2002
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Applications of an improved estimator of the constitutive relation error to plasticity problems
Gallimard, L. ; Ladeveze, P. ; Pelle, J.P. ;
Structural Engineering and Mechanics, volume 14, issue 4, 2002, Pages 381~400
DOI : 10.12989/sem.2002.14.4.381
This paper presents several applications of an improved estimator of the constitutive relation error (CRE) for plasticity problems. The cumulative aspect of the CRE estimator with respect to time is analyzed and we propose a first analysis of the local effectivity indexes of the CRE estimator in plasticity.
Buckling of rectangular plates with mixed edge supports
Xiang, Y. ; Su, G.H. ;
Structural Engineering and Mechanics, volume 14, issue 4, 2002, Pages 401~416
DOI : 10.12989/sem.2002.14.4.401
This paper presents a domain decomposition method for buckling analysis of rectangular Kirchhoff plates subjected to uniaxial inplane load and with mixed edge support conditions. A plate is decomposed into two rectangular subdomains along the change of the discontinuous support conditions. The automated Ritz method is employed to derive the governing eigenvalue equation for the plate system. Compatibility conditions are imposed for transverse displacement and slope along the interface of the two subdomains by modifying the Ritz trial functions. The resulting Ritz function ensures that the transverse displacement and slope are continuous along the entire interface of the two subdomains. The validity and accuracy of the proposed method are verified with convergence and comparison studies. Buckling results are presented for several selected rectangular plates with various combination of mixed edge support conditions.
Identification of modal damping ratios of structures with closely spaced modal frequencies
Chen, J. ; Xu, Y.L. ;
Structural Engineering and Mechanics, volume 14, issue 4, 2002, Pages 417~434
DOI : 10.12989/sem.2002.14.4.417
This paper explores the possibility of using a combination of the empirical mode decomposition (EMD) and the Hilbert transform (HT), termed the Hilbert-Huang transform (HHT) method, to identify the modal damping ratios of the structure with closely spaced modal frequencies. The principle of the HHT method and the procedure of using the HHT method for modal damping ratio identification are briefly introduced first. The dynamic response of a two-degrees-of-freedom (2DOF) system under an impact load is then computed for a wide range of dynamic properties from well-separated modal frequencies to very closely spaced modal frequencies. The natural frequencies and modal damping ratios identified by the HHT method are compared with the theoretical values and those identified using the fast Fourier transform (FFT) method. The results show that the HHT method is superior to the FFT method in the identification of modal damping ratios of the structure with closely spaced modes of vibration. Finally, a 36-storey shear building with a 4-storey light appendage, having closely spaced modal frequencies and subjected to an ambient ground motion, is analyzed. The modal damping ratios identified by the HHT method in conjunction with the random decrement technique (RDT) are much better than those obtained by the FFT method. The HHT method performing in the frequency-time domain seems to be a promising tool for system identification of civil engineering structures.
General stress-strain model for concrete or masonry response under uniaxial cyclic compression
La Mendola, Lidia ; Papia, Maurizio ;
Structural Engineering and Mechanics, volume 14, issue 4, 2002, Pages 435~454
DOI : 10.12989/sem.2002.14.4.435
The paper proposes analytical forms able to represent with very good approximation the constitutive law experimentally deducible by means of uniaxial cyclic compressive tests on material having softening post-peak behaviour in compression and negligible tensile strength. The envelope, unloading and reloading curves characterizing the proposed model adequately approach structural responses corresponding to different levels of nonlinearity and ductility, requiring a not very high number of parameters to be calibrated experimentally. The reliability of the model is shown by comparing the results that it is able to provide with the ones analytically deduced from two reference models (one for concrete, another for masonry) available in the literature, and with experimental results obtained by the authors in the framework of a research in progress.
Stress wave propagation in 1-D and 2-D media using Smooth Particle Hydrodynamics method
Liu, Z.S. ; Swaddiwudhipong, S. ; Koh, C.G. ;
Structural Engineering and Mechanics, volume 14, issue 4, 2002, Pages 455~472
DOI : 10.12989/sem.2002.14.4.455
The paper involves the study on the elastic and elasto-plastic stress wave propagation in the 1-D and 2-D solid media. The Smooth Particle Hydrodynamics equations governing the elastic and elasto-plastic large deformation dynamic response of solid structures are presented. The proposed additional stress points are introduced in the formulation to mitigate the tensile instability inherent in the SPH approach. Both incremental rate approach and leap-frog algorithm for time integration are introduced and the new solution algorithm is developed and implemented. Two examples on stress wave propagation in aluminium bar and 2-D elasto-plastic steel plate are included. Results from the proposed SPH approach are compared with available analytical values and finite element solutions. The comparison illustrates that the stress wave propagation problems can be effectively solved by the proposed SPH method. The study shows that the SPH simulation is a reliable and robust tool and can be used with confidence to treat transient dynamics such as linear and non-linear transient stress wave propagation problems.
A matrix displacement formulation for minimum weight design of frames
Orakdogen, Engin ;
Structural Engineering and Mechanics, volume 14, issue 4, 2002, Pages 473~489
DOI : 10.12989/sem.2002.14.4.473
A static linear programming formulation for minimum weight design of frames that is based on a matrix displacement method is presented in this paper. According to elementary theory of plasticity, minimum weight design of frames can be carried out by using only the equilibrium equations, because the system is statically determinate when at an incipient collapse state. In the present formulation, a statically determinate released frame is defined by introducing hinges into the real frame and the bending moments in yield constraints are expressed in terms of unit hinge rotations and the external loads respectively, by utilizing the matrix displacement method. Conventional Simplex algorithm with some modifications is utilized for the solution of linear programming problem. As the formulation is based on matrix displacement method, it may be easily adopted to the weight optimization of frames with displacement and deformation limitations. Four illustrative examples are also given for comparing the results to those obtained in previous studies.
A state space method for coupled flutter analysis of long-span bridges
Ding, Quanshun ; Chen, Airong ; Xiang, Haifan ;
Structural Engineering and Mechanics, volume 14, issue 4, 2002, Pages 491~504
DOI : 10.12989/sem.2002.14.4.491
A state-space method is proposed to analyze the aerodynamically coupled flutter problems of long-span bridges based on the modal coordinates of structure. The theory about complex modes is applied in this paper. The general governing equation of the system is converted into a complex standard characteristic equation in a state space format, which contains only two variables. The proposed method is a single-parameter searching method about reduced velocity, and it need not choose the participating modes beforehand and has no requirement for the form of structure damping matrix. The information about variations of system characteristics with reduced velocity and wind velocity can be provided. The method is able to find automatically the lowest critical flutter velocity and give relative amplitudes, phases and energy ratios of the participating modes in the flutter motion. Moreover, the flutter analysis of Jiangyin Yangtse suspension bridge with 1385 m main span is performed. The proposed method has proved reliable in its methodology and efficient in its use.