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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 2, Issue 4 - Dec 1994
Volume 2, Issue 3 - Sep 1994
Volume 2, Issue 2 - Jun 1994
Volume 2, Issue 1 - Mar 1994
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Unified theory of reinforced concrete-A summary
Hsu, Thomas T.C. ;
Structural Engineering and Mechanics, volume 2, issue 1, 1994, Pages 1~16
DOI : 10.12989/sem.1994.2.1.001
A unified theory has recently been developed for reinforced concrete structures (Hsu 1993), subjected to the four basic actions - bending, axial load, shear and torsion. The theory has five components, namely, the struts-and-ties model, the equilibrium (or plasticity) truss model, the Bernoulli compatibility truss model, the Mohr compatibility truss model and the softened truss model. Because the last three models can satisfy the stress equilibrium, the strain compatibility and the constitutive laws of materials, they can predict not only the strength, but also the load-deformation history of a member. In this paper the five models are summarized to illustrate their intrinsic consistency.
An efficient four node degenerated shell element based on the assumed covariant strain
Choi, Chang-Koon ; Paik, Jong-Gyun ;
Structural Engineering and Mechanics, volume 2, issue 1, 1994, Pages 17~34
DOI : 10.12989/sem.1994.2.1.017
This paper proposes a new four node degenerated shell element. In the formulation of the new element, the assumed covariant shear strains are used to avoid the shear locking problem, and the assumed covariant membrane strains are applied to alleviate the membrane locking problem and also to improve the membrane bending performance. The assumed covariant strains are obtained from the covariant strain field defined with respect to the element natural coordinate system. This formulation enables us to obtain a shell element, which does not produce spurious singular modes, avoids locking phenomena, and excels in calculation efficiency. Several examples in this paper indicate that, despite its simplicity, the achieved accuracy and convergence are satisfactory.
A concrete plasticity model with elliptic failure surface and independent hardening/softening
Al-Ghamedy, Hamdan N. ;
Structural Engineering and Mechanics, volume 2, issue 1, 1994, Pages 35~48
DOI : 10.12989/sem.1994.2.1.035
A plasticity-based concrete model is proposed. The failure surface is elliptic in the
stress space. Independent hardening as well as softening is assumed in tension, compression, and shear. The nonlinear inelastic action initiates from the origin in the
) diagram. Several parameters are incorporated to control hardening/softening regions. The model is incorporated into a nonlinear finite element program along with other classical models. Several examples are solved and the results are compared with experimental data and other failure criteria. "Reasonable results" and stable solutions are obtained for different types of reinforced concrete oriented structures.
Axisymmetric analysis of multi-layered transversely isotropic elastic media with general interlayer and support conditions
Lee, J.S. ; Jiang, L.Z. ;
Structural Engineering and Mechanics, volume 2, issue 1, 1994, Pages 49~62
DOI : 10.12989/sem.1994.2.1.049
Based on the transfer matrix approach and integral transforms, a solution method is developed for the stress analysis of axisymmetrically loaded transversely isotropic elastic media with generalized interlayer and support conditions. Transfer functions (Green's functions in the transformed domain) are obtained in explicit integral form. For several problems of practical interest with different loading and support conditions, solutions are worked out in detail. For the inversion operation, an efficient technique is introduced to remedy the slow convergence of numerical integrals involving oscillating functions. Several illustrative examples are considered and numerical results are presented.
Analysis of dry friction hysteresis in a cable under uniform bending
Huang, Xiaolun ; Vinogradov, Oleg ;
Structural Engineering and Mechanics, volume 2, issue 1, 1994, Pages 63~80
DOI : 10.12989/sem.1994.2.1.063
A cable is considered as a system of helical wires and a core with distributed dry friction forces at their interfaces. Deformations of the cable subjected to a uniform bending are analyzed. It is shown that there is a critical bending curvature when a slip at the wire-core interface occurs. It originates at the neutral axis of the cross section of the cable and then spreads symmetrically over the cross section with the increase of bending. The effect of slippage on the cable stiffness is investigated. This model is also used to analyze a cable under the quasi-static cyclic bending. Explicit expression for the hysteretic losses per cycle of bending is derived. Numerical examples are given to show the influence of dry friction and helix angle on the bending stiffness and hysteretic losses in the cable.
Inelastic response of multistory buildings under earthquake excitation
Thambiratnam, D.P. ; Corderoy, H.J.B. ; Gao, H. ;
Structural Engineering and Mechanics, volume 2, issue 1, 1994, Pages 81~94
DOI : 10.12989/sem.1994.2.1.081
It is well recognized that structures designed to resist strong ground motions should be able to withstand substantial inelastic deformations. A simple procedure has been developed in this paper to monitor the dynamic earthquake response (time-history analysis) of both steel and concrete multistorey buildings in the inelastic range. The building is treated as a shear beam model with three degrees of freedom per floor. The entire analysis has been programmed to run on a microcomputer and can output time histories of displacements, velocities, accelerations and member internal forces at any desired location. A record of plastic hinge formation and restoration to elastic state is also provided. Such information can be used in aseismic analysis and design of multistorey buildings so as to control the damage and optimize their performance.
Modelling the dynamic response of railway track to wheel/rail impact loading
Cai, Z. ; Raymond, G.P. ;
Structural Engineering and Mechanics, volume 2, issue 1, 1994, Pages 95~112
DOI : 10.12989/sem.1994.2.1.095
This paper describes the formulation and application of a dynamic model for a conventional rail track subjected to arbitary loading functions that simulate wheel/rail impact forces. The rail track is idealized as a periodic elastically coupled beam system resting on a Winkler foundation. Modal parameters of the track structure are first obtained from the natural vibration characteristics of the beam system, which is discretized into a periodic assembly of a specially-constructed track element and a single beam element characterized by their exact dynamic stiffness matrices. An equivalent frequency-dependent spring coefficient representing the resilient, flexural and inertial characteristics of the rail support components is introduced to reduce the degrees of freedom of the track element. The forced vibration equations of motion of the track subjected to a series of loading functions are then formulated by using beam bending theories and are reduced to second order ordinary differential equations through the use of mode summation with non-proportional modal damping. Numerical examples for the dynamic responses of a typical track are presented, and the solutions resulting from different rail/tie beam theories are compared.
Buckling of post-tensioned composite beams
Bradford, M.A. ;
Structural Engineering and Mechanics, volume 2, issue 1, 1994, Pages 113~123
DOI : 10.12989/sem.19126.96.36.199
A method for computing the elastic buckling prestressing force of a post-tensioned composite steel-concrete tee-beam is presented. The method is based on a virtual work formulation, and incorporates the restraint provided by the concrete slab to the buckling displacements of the steel beam. The distortional buckling solutions are shown to be given by a quadratic equation. The application of the analysis to calculation buckling strengths is given, based on codified rules for beam-columns. Conclusions are then drawn on the importance of distortional buckling when a post-tensioned composite beam is stressed during jacking.