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CONTENTS
Volume 2, Number 4, August 2002
 

Abstract
In this paper, the solution of a semi-infinite plane with one circular hole is presented. This solution is induced by repeatedly superposing the solution of an infinite plane with one circular hole and that of a semi-infinite plane without holes to cancel out the stresses arising on both boundaries. This procedure isrncarried out until the stresses arising on both boundaries converge. This method does not require complicated calculation procedures as does the method using stress functions defined in a bipolar coordinate system. Some numerical results are shown by graphical representations.

Key Words
shallow circular hole; arbitrary load; stress analysis; constraint-release technique.

Address
Department of Civil Engineering, Kagoshima National College of Technology,rnHayato, Kagoshima, 899-5193, JapanrnDepartment of Civil Engineering, Oita Technical High School, Oita, 870-0948, JapanrnDepartment of Civil and Environmental Engineering, Yamanashi University,rnKofu, Yamanashi, 400-8511, JapanrnDepartment of General Education, Fukushima National College of TechnologyrnIwaki, Fukushima, 970-8034, Japan

Abstract
The high-temperature material properties of steel are very important to the fire resistance analysis of high-strength bolt connections. This paper reports on the results of the experimental studies on the high-temperature properties of 20 MnTiB steel which is widely used in high-strength bolts, and the frictionrncoefficient of 16Mn steel plates at elevated temperature which is a necessary parameter for bolted frictional connection analysis. The test data includes yield strength, limit strength, modulus of elasticity, elongation and expansion coefficient of 20MnTiB steel at elevated temperature, and the friction coefficients between two 16Mn steel plates under elevated temperatures and after cooling. Based on the data from the tests, the mathematical models for predicting the mechanical properties of 20MnTiB steel and friction coefficients of 16Mn steel plates have been established.

Key Words
high-strength bolts; material properties; high-temperature; connections; friction coefficients.

Address
Department of Civil Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, P.R. China

Abstract
In the present investigation the experimental and theoretical flexural and compressive behavior of short tubular steel columns filled with plain concrete and fiber-reinforced concrete (FRC) was examined. For a given length of the members, the effects of different geometry and dimensions of the transverse crosssectionrn(square and circular) were investigated. Constituent materials were characterized through direct tensile tests on steel coupons and through compressive and split tension tests on concrete cylinders. Load-axial shortening and load-deflection curves were recorded for unfilled and composite members. Finally, simplifiedrnexpressions for the calculus of the load-deflection curves based on the cross-section analysis were given and the ultimate load of short columns was predicted.

Key Words
compressive tests; flexural tests; composite members; fiber-reinforced concrete; ultimate load; load-deflection curves.

Address
Dipartimento di Ingegneria Strutturale e Geotecnica, Universita di Palermo, Viale delle Scienze-I-90128, ltaly

Abstract
A research investigation of single bolt lap-plate connection load-deformation behavior is presented. Each important characteristic of this behavior is evaluated and two methods for analytically approximating the behavior are developed and presented. The first of these methods is a component method in which the behavior of the connection is modeled as a combination of the behavior of the parts. The second method utilizes a number of parametric relationships that relate the connection parameters to coefficients of two non-linear continuous analytical curves. The test results from four independent experimental programs that investigated the behavior of single bolt lap-plate connections are used in the development and verification of these methods.

Key Words
partially restrained connections; load vs slip behavior of bolt connect.

Address
Stanley D. Lindsey and Assoc., 2300 Windy Ridge Parkway, S.E., Suite 200 South,rnAtlanta, GA, 30339-5668, U.S.ArnThe Via Department of Civil and Environmental Engineering,rnVirginia Polytechnic Institute and State University, Blacksburg, VA, 24061-0105, U.S.A.rn

Abstract
An energy method of analysis is presented which can be used to study the inelastic lateral-distortional buckling of hot-rolled I-sections continuously restrained at the level of the tension flange. The numerical modelling leads to the incremental and iterative solution of a fourth-order eigenproblem, with vey rapid solutions being obtainable, so as to enable a study of the factors that influence the strength of continuously restained I-beams to be made. Although hot-rolled I-scetions generally have stocky webs and are not susceptible to reductions in their overall buckling loads as a result of cross-sectional distortion, the effect of elastic restraints, particulartly against twist rotation, can lead to buckling modes in which the effect of distortion is quite severe. While the phenomenon has been studied previously for elastic lateral-distortional buckling, it is extended in this paper to include the constitutive relationship characteristics of mild steel, and incorporates both the so-called \'polynomial\' and \'simplified\' models of residual stresses. The method is validated against inelastic lateral-torsional buckling solutions reported in previous studies, and is applied to illustrate some inelastic buckling problems. It is noted that over a certain range of memeber slenderness the provisions of the Australian AS4100 steel standard are unconservative.

Key Words
beams, continuous restraint, elastic restraint, energy method, inelastic buckling, residual stresses, yielding

Address
Earthquake engineering research center, Seoul national university, Seoul 151-744, KorearnSchool of Civil and Environmental Engineering, The university of New South Wales, UNSW, Sydney, NSW 2052, Australia


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