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CONTENTS
Volume 14, Number 1, January 2013
 

Abstract
This paper presents the formulation for a novel force-based 1-D compound-element that captures both material and second order P-

Key Words
flexibility; nonlinearity; P-

Address
Hamid R. Valipour: Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, The University of New South Wales; Mark A. Bradford: Centre for Infrastructure Engineering and Safety, The University of New South Wales

Abstract
The paper presents a numerical investigation, done with the computer program SAFIR, in order to obtain simpler finite element models for representing the behaviour of the partially protected composite steel concrete slabs in fire situations, considering the membrane action. Appropriate understanding and modelling of the particular behaviour of composite slabs allows a safe approach, but also substantial savings on the thermal insulation that has to be applied on the underlying steel structure. The influence of some critical parameters on the behaviour and fire resistance of composite slabs such as the amount of reinforcing steel, the thickness of the slab and the edge conditions is also highlighted. The results of the numerical analyses are compared with the results of three full scale fire tests on composite slabs that have been performed in recent years.

Key Words
composite slabs, partially protected, fire design, membrane action

Address
R. Zaharia and C. Vulcu: The

Abstract
Fiber reinforced polymers (FRP) materials are increasingly being used for strengthening and repair of steel structures. An issue that concerns engineers in steel members which are retrofitted with FRP is stress experienced due to temperature changes. The changing temperature affects the interface bond between the FRP and Steel. This research focused on the effects of cyclical thermal loadings on the interface properties of FRP bounded to steel members. Over fifty tests were conducted to investigate the thermal effects on bonding between FRP and steel, which were cycled from temperature of -11

Key Words
fiber reinforced materials; CFRP; GFRP; polymers; tack coat; epoxy resin

Address
Vahab Toufigh, Vahid Toufigh and Hamid Saadatmanesh: Dept of Civil Engineering and Engineering Mechanics, Tucson, Arizona, USA

Abstract
The prediction of the low cycle fatigue (LCF) life of beam-column connections requires an LCF model that is developed using specific geometric information. The beam-column connection has several geometric variables, and changes in these variables must be taken into account to ensure sufficient robustness of the design. Previous research has verified that the finite element model (FEM) can be used to simulate LCF behavior at the end plate moment connection (EPMC). Three critical parameters, i.e., end plate thickness, beam flange thickness, and bolt distance, have been selected for this study to determine the geometric effects on LCF behavior. Seven FEMs for different geometries have been developed using these three critical parameters. The finite element analysis results have led to the development of a modified LCF model for the critical parameter groups.

Key Words
low cycle fatigue; end plate moment connection; finite element model

Address
Chemin Lim: Shell International Exploration and Production Inc., Houston, Texas 77079, USA; Wonchang Choi: Dept. of Civil, Architectural and Environmental Engineering, North Carolina A and T State University, Greensboro, NC 27411, USA; Emmett A. Sumner: Dept. of Civil Engineering, North Carolina State University, Raleigh, North Carolina, USA

Abstract
In this paper Hamiltonian Approach (HA) have been used to analysis the nonlinear free vibration of Simply-Supported (S-S) and for the Clamped-Clamped (C-C) Euler-Bernoulli beams fixed at one end subjected to the axial loads. First we used Galerkin\'s method to obtain an ordinary differential equation from the governing nonlinear partial differential equation. The effect of different parameter such as variation of amplitude to the obtained on the non-linear frequency is considered. Comparison of HA with Runge-Kutta 4th leads to highly accurate solutions. It is predicted that Hamiltonian Approach can be applied easily for nonlinear problems in engineering.

Key Words
non-linear vibration, analytical solution, beam vibration, Runge-Kutta 4th

Address
Mahmoud Bayat, Iman Pakar and Mahdi Bayat: Department of Civil Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran

Abstract
The present work deals with the thermomechanical bending response of functionally graded plates resting on Winkler-Pasternak elastic foundations. Theoretical formulations are based on a recently developed refined trigonometric shear deformation theory (RTSDT). The theory accounts for trigonometric distribution of transverse shear stress, and satisfies the free transverse shear stress conditions on the top and bottom surfaces of the plate without using shear correction factor. Unlike the conventional trigonometric shear deformation theory, the present refined trigonometric shear deformation theory contains only four unknowns as against five in case of other shear deformation theories. The material properties of the functionally graded plates are assumed to vary continuously through the thickness, according to a simple power law distribution of the volume fraction of the constituents. The elastic foundation is modelled as twoparameter Pasternak foundation. The results of the shear deformation theories are compared together. Numerical examples cover the effects of the gradient index, plate aspect ratio, side-to-thickness ratio and elastic foundation parameters on the thermomechanical behavior of functionally graded plates. It can be concluded that the proposed theory is accurate and efficient in predicting the thermomechanical bending response of functionally graded plates.

Key Words
refined plate theory; thermomechanical loading; FGM; elastic foundations

Address
Bachir Bouderba: Laboratoire des Materiaux et Hydrologie, Universite de Sidi Bel Abbes, BP 89 Cite Ben M


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