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Aluminum structures: advances, design and construction
D I S C U S S I O N OF PAPERS Buckling strength of deformable monosymmetric I-beams M. A. Bradford: Eng. Struct. 1988, 10(3), 167-173
This paper is a well written and clear exposition of the solution of a very difficult problem. The results are validated with solutions obtained by others, and final results are presented concisely so that one can appreciate the effect of distortional buckling as compared to lateraltorsional buckling. The value of the paper would have been enhanced if it were to contain results of studies of other geometric combinations. This reviewer comes away with the comfortable feeling that distortional buckling of welded plate girders is not a serious problem. Is this, indeed, always the case?
T. V. Galambos University of Minnesota, USA
Author's reply The author appreciates the comments of Professor Galambos on the paper. The results show that the interaction between slenderness and yielding based on distortional buckling is the same as that between slenderness and yielding based on lateral-torsional buckling. For cases of high monosymmetry such as a T-beam with the free edge of its stem in compression, the elastic distortional buckling moment 1, as well as the inelastic distortional buckling moment, is reduced significantly below its lateral-torsional value. However, most other cases considered show that distortional buckling is not a serious problem with regard to the strength of a steel I-section member.
References 1 Bradford, M. A. 'Elastic buckling modes in tee-section beams', Cir. Eng. Trans., Inst. Eng. Aust. (1988) CE30 (1), 36-39 2 Bradford, M. A. 'Strength of beams on seat supports', Proc. Eleventh Australian Conf. Mech. Structures and Materials, Auckland, New Zealand, 1988, 269-272
BOOK REVIEW Steel structures: advances, design and construction Aluminium structures: advances, design and construction Composite steel structures: advances, design and construction Edited by R. Narayanan Elsevier Applied Science, London, 1987 592, 202 and 178 pages respectively £85:00; £28:00 and £25:00 respectively) This three volume set contains the 115 papers presented at a conference held in Cardiff in July 1987. As the title suggests, the contents range widely over the whole spectrum of steel and aluminium structures from the presentation of quite fundamental research, through state-of-theart reviews and background papers on new code developments, to applications on specific projects. The field of interest is also particularly wide, embracing aeronautical, civil and marine construction. Although not all authors have followed the required paper format, the quality of printing and general clarity of the reproduction have ensured a very acceptable set of books. Approximately two thirds of the papers appear in the steel volume, organised into 10 sections covering design philosophy, bridges, ships, offshore applications, frames, connections, cold-formed sections, members, dynamics, analysis and the familiar "catch-all" of special problems. Many topical issues such as floor vibration in buildings, tubular joint design, inclined hangers in suspension
bridges and tensile resistance of connections are addressed. The volume ends with an interesting review of the state of steelwork research as of 1986 in UK universities and polytechnics. The composite volume devotes almost 50 % of its space to the currently very fashionable area of composite metal deck floor systems but also deals with other forms of composite metal construction ranging from foam filled panels to composite bridges. The large degree of current UK interest and activity in this subject area is reflected in the fact that this is the only volume for which more than 50 per cent of the authors are UK based. Although these books are aimed principally at those working either in research and development or at the more innovative end of design, the wide ranging nature of the subjects addressed means that most organisations with an interest in metal structures will find something of direct use. For example, the volume on aluminium structures contains several papers written by those with direct responsibility for new code developments in most of the European countries, as well as more fundamental work on buckling, fatigue and jointing. For those who attended the conference, these volumes provide a reminder of just how much interesting work was presented. For those unable to have been present, possession of the books will give them access to many of the more important new developments in metal structures.
D. Nethercot
Eng. Struct. 1989, Vol. 11, January
57
This paper is a well written and clear exposition of the solution of a very difficult problem. The results are validated with solutions obtained by others, and final results are presented concisely so that one can appreciate the effect of distortional buckling as compared to lateraltorsional buckling. The value of the paper would have been enhanced if it were to contain results of studies of other geometric combinations. This reviewer comes away with the comfortable feeling that distortional buckling of welded plate girders is not a serious problem. Is this, indeed, always the case?
T. V. Galambos University of Minnesota, USA
Author's reply The author appreciates the comments of Professor Galambos on the paper. The results show that the interaction between slenderness and yielding based on distortional buckling is the same as that between slenderness and yielding based on lateral-torsional buckling. For cases of high monosymmetry such as a T-beam with the free edge of its stem in compression, the elastic distortional buckling moment 1, as well as the inelastic distortional buckling moment, is reduced significantly below its lateral-torsional value. However, most other cases considered show that distortional buckling is not a serious problem with regard to the strength of a steel I-section member.
References 1 Bradford, M. A. 'Elastic buckling modes in tee-section beams', Cir. Eng. Trans., Inst. Eng. Aust. (1988) CE30 (1), 36-39 2 Bradford, M. A. 'Strength of beams on seat supports', Proc. Eleventh Australian Conf. Mech. Structures and Materials, Auckland, New Zealand, 1988, 269-272
BOOK REVIEW Steel structures: advances, design and construction Aluminium structures: advances, design and construction Composite steel structures: advances, design and construction Edited by R. Narayanan Elsevier Applied Science, London, 1987 592, 202 and 178 pages respectively £85:00; £28:00 and £25:00 respectively) This three volume set contains the 115 papers presented at a conference held in Cardiff in July 1987. As the title suggests, the contents range widely over the whole spectrum of steel and aluminium structures from the presentation of quite fundamental research, through state-of-theart reviews and background papers on new code developments, to applications on specific projects. The field of interest is also particularly wide, embracing aeronautical, civil and marine construction. Although not all authors have followed the required paper format, the quality of printing and general clarity of the reproduction have ensured a very acceptable set of books. Approximately two thirds of the papers appear in the steel volume, organised into 10 sections covering design philosophy, bridges, ships, offshore applications, frames, connections, cold-formed sections, members, dynamics, analysis and the familiar "catch-all" of special problems. Many topical issues such as floor vibration in buildings, tubular joint design, inclined hangers in suspension
bridges and tensile resistance of connections are addressed. The volume ends with an interesting review of the state of steelwork research as of 1986 in UK universities and polytechnics. The composite volume devotes almost 50 % of its space to the currently very fashionable area of composite metal deck floor systems but also deals with other forms of composite metal construction ranging from foam filled panels to composite bridges. The large degree of current UK interest and activity in this subject area is reflected in the fact that this is the only volume for which more than 50 per cent of the authors are UK based. Although these books are aimed principally at those working either in research and development or at the more innovative end of design, the wide ranging nature of the subjects addressed means that most organisations with an interest in metal structures will find something of direct use. For example, the volume on aluminium structures contains several papers written by those with direct responsibility for new code developments in most of the European countries, as well as more fundamental work on buckling, fatigue and jointing. For those who attended the conference, these volumes provide a reminder of just how much interesting work was presented. For those unable to have been present, possession of the books will give them access to many of the more important new developments in metal structures.
D. Nethercot
Eng. Struct. 1989, Vol. 11, January
57