- Emeritus Professor of Civil Engineering at the University of Edinburgh. Prolific researcher in structural enginee... moreEmeritus Professor of Civil Engineering at the University of Edinburgh. Prolific researcher in structural engineering, specialising in shell structures, granular solids, and storage structures as silos and tanks, producing to over 470 scientific papers. An extensive range of consultancies concerning failures in silos and tanks in many countries leading to over 150 extended reports. Leading author of the Eurocodes on metal shell structures (EN 1993-1-6), plate assemblies forming boxes (EN 1993-1-7), pressures on silos and tanks (EN 1991-4), structural design of metal silos (EN 1993-4-1) and structural design of tanks (EN 1993-4-2). Fellow of the Royal Academy of Engineering. Fellow of the Royal Society of Edinburgh. Fellow of ASCE, ICE and IStructE. MA Clare College Cambridge 1970. PhD Sydney University 1978. Dr Ing (honoris causa) Karlsruhe Institute of Technology 2017.edit
Publisher Summary The chapter presents an outline description of the behavior of a cylindrical steel shell that is discretely supported on several brackets, each rigidly connected to a stiff column or floor. The linear, materially... more
Publisher Summary The chapter presents an outline description of the behavior of a cylindrical steel shell that is discretely supported on several brackets, each rigidly connected to a stiff column or floor. The linear, materially nonlinear, geometrically nonlinear, and bifurcation behaviors of the shell are outlined, but space restrictions have prevented the complex interactions between the change of geometry and progressive yielding from being shown. An example shell is shown in which bifurcation and plasticity interact in determining the failure condition. For this geometry, it is shown that the behavior is not very imperfection sensitive, so design rules should not follow the corresponding formulations for uniform axial compression too closely.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Numerical prediction of wall pressures in silos has been a major topic of research in the last few decades in the international silos research community. Numerous finite element studies have been carried out on filling pressures in silos.... more
Numerical prediction of wall pressures in silos has been a major topic of research in the last few decades in the international silos research community. Numerous finite element studies have been carried out on filling pressures in silos. Most of these studies were carried out by treating the self-weight of the ensiled solid as a 'switch-on'gravity. However, this approach does not simulate the feature that most silos are filled progressively in practice. Following an early investigation into the effects of ring stiffeners, ...
Research Interests:
This paper presents an analytical solution for the solid stresses in a silo with an internal tube. The research was conducted to support the design of a group of full scale silos with large inner concrete tubes. The silos were blasted and... more
This paper presents an analytical solution for the solid stresses in a silo with an internal tube. The research was conducted to support the design of a group of full scale silos with large inner concrete tubes. The silos were blasted and formed out of solid rock underground for storing iron ore pellets. Each of these silos is 40m in diameter and has a 10m diameter concrete tube with five levels of openings constructed at the centre of each rock silo. A large scale model was constructed to investigate the stress regime for the stored pellets and to evaluate the solids flow pattern and the loading on the concrete tube. This paper focuses on the development of an analytical solution for stresses in the iron ore pellets in the silo and the effect of the central tube on the stress regimes. The solution is verified using finite element analysis before being applied to analyse stresses in the solid in the full scale silo and the effect of the size of the tube.
Research Interests:
Research Interests:
The Standards Association of Australia has prepared a draft limit state version of the AS1250 - SAA Steel Structures Code. At the same time a major revision was undertaken to take advantage of much of the research that has taken place... more
The Standards Association of Australia has prepared a draft limit state version of the AS1250 - SAA Steel Structures Code. At the same time a major revision was undertaken to take advantage of much of the research that has taken place since the AS1250 was first issued in 1968. This paper summarises the bases of the beam, column and beam-column LSD rules drafted for the next Australian Steel Code, which is expected to be published in 1988.
Research Interests:
Research Interests:
Research Interests: Engineering, Mechanical Engineering, Civil Engineering, Aerospace Engineering, Structural Engineering, and 11 moreFinite Element Analysis, Statistical Inference, Strain Measurement, Cost effectiveness, Robustness (evolution), Silo, Shell Structure, Thin Walled Structures, Pressure Distribution, Structural Response, and Design rules
Research Interests:
Research Interests:
Research Interests:
Research Interests:
The response of flat plate and column structures to lateral loading is closely associated with the stiffness of the slab/column joints. Many previous theoretical and experimental investigations have studied the linear elastic response of... more
The response of flat plate and column structures to lateral loading is closely associated with the stiffness of the slab/column joints. Many previous theoretical and experimental investigations have studied the linear elastic response of sway systems but few experimental results are available on the non-linear behaviour of concrete slab/column joints. Results from exeriments on reinforced concrete models are presented in this paper. These tests show a non-linear response from very low load levels. The behaviour of the test specimens is compared with both linear elastic and empirical predictions. The results are also compared with an equivalent slab derived from the equivalent frame method of ACI 318-77. This is found to give a closer description of the observed behaviour than the elastic theories (A). (TRRL)
Research Interests:
Research Interests:
ABSTRACT
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
The Earthquake Engineering Online Archive. Triaxial testing of dry granular solids at very low stresses. Ooi, Jin Y.; Rotter, JM; Hull, TS. no. R588, Sydney : School of Civil and Mining Engineering, University of Sydney, Research ...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Many theories for the pressures in silo hoppers have been proposed. These are generally simplified versions of elastic or plastic analyses of the solid. As a result, they contain many assumptions of uncertain validity. Rigorous elastic... more
Many theories for the pressures in silo hoppers have been proposed. These are generally simplified versions of elastic or plastic analyses of the solid. As a result, they contain many assumptions of uncertain validity. Rigorous elastic and plastic analyses seem not to have been conducted often, and the nature of the pressure distributions which arise from these assumptions are not widely known. The aim of this paper is to show the form of storing pressure distributions given by rigorous elastic and elastic-plastic calculations for the solid in a conical hopper. It is not suggested that the solid is an ideal elastic or an ideal elastic-plastic solid. However, the results of calculations using these rigorous analytical assumptions should provide the reference cases by which other theories may be judged, since they do not violate static or kinematic requirements in any respect. It is suggested that the calculations are relevant only to the filling and storing state. Rigorous non-linear...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Page 347. 334 BUCKLING IN THIN ELASTIC CYLINDERS ON COLUMN SUPPORTS J. MICHAEL ROTTERl, JIN-GUANG TENG2 and HONG-YU LI3 l. 3Department of Civil Engineering and Building Science, University of Edinburgh ...
Research Interests:
Research Interests:
Research Interests:
The paper presents a method for designing steel/ concrete composite beams with a ductile response to overload. Equations are given describing the behaviour of a composite beam cross- section in sagging bending as the loading is increased... more
The paper presents a method for designing steel/ concrete composite beams with a ductile response to overload. Equations are given describing the behaviour of a composite beam cross- section in sagging bending as the loading is increased up to failure. The effects of strain- hardening in the steel are quantified. The effects of slab reinforcement, haunches and cover plates on the cross- section behaviour are illustrated. A simple test is developed which distinguishes between ductile and strain- softening beams. The use of the test in design calculations is demonstrated (Author/TRRL)
This paper shows that comparatively simple finite element techniques which include appropriate wall friction characteristics can accurately model the pressures exerted by stored solids on silo walls. The aim of this development is to... more
This paper shows that comparatively simple finite element techniques which include appropriate wall friction characteristics can accurately model the pressures exerted by stored solids on silo walls. The aim of this development is to study the pressure distributions in squat silos with flexible walls.
Eccentric discharge is known to be a cause of dramatic and catastrophic failures in steel bins of circular planform. Most existing studies of the structural consequences of eccentric discharge assume that the two-dimensional curved shell... more
Eccentric discharge is known to be a cause of dramatic and catastrophic failures in steel bins of circular planform. Most existing studies of the structural consequences of eccentric discharge assume that the two-dimensional curved shell wall may be represented by a one-dimensional ring and concentrate on the development of circumferential bending moments in the wall of the bin. This simplification of the structural form has led to a serious misunderstanding of the load-carrying mechanism in steel bins. Although circumferential bending accounts for some benign 'denting' failures, it cannot explain the catastrophic buckling failures often seen in eccentrically discharged steel bins. This paper demonstrates the real load-carrying mechanism of thin steel bins subject to eccentric discharge, and shows why catastrophic buckling failures are to be expected. A careful analysis is given of the pressures exerted on the bin wall by the flowing and static stored solids. These pressures...
A draft standards association of Australia (SAA) code for composite structures is being prepared. Two design methods for braced composite columns, based on an elastic analysis of the structure, are proposed. One is a modification of the... more
A draft standards association of Australia (SAA) code for composite structures is being prepared. Two design methods for braced composite columns, based on an elastic analysis of the structure, are proposed. One is a modification of the method for reinforced concrete columns in the new draft SAA concrete structures code (moment magnifier method). The other is a method developed by rotter (strength reduction method) and is more closely related to the design approach for steel columns with the use of a column curve for axially loaded members. The methods are compared with the results of an accurate inelastic column stability analysis for a range of cross sections, slenderness, end eccentricities and end moment ratios. For the practical range of columns, both methods have similar reliability and would therefore produce similar designs for the same loading conditions (a).