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- Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese
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- Volume 44, Issue 2, 2002
Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese - Volume 44, Issue 2, 2002
Volumes & issues
Volume 44, Issue 2, 2002
An evaluation of design-build as procurement method for building and civil engineering projects in South Africa, Journal of the South African Institution of Civil Engineering, 44(1) 2002, pp.13-19 : errataSource: Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese 44 (2002)More Less
Extracted from text ... Errata An evaluation of design-build as procurement method for building and civil engineering projects in South Africa K Grobler and L Pretorius Journal of the South African Institution of Civil Engineering, 44(1) 2002, pp 13-19 Some of the figures in tables 3, 4 and 7 were transposed during conversion . The correct tables are given below. Table 3 Involvement of designers and contractors in public and private sector projects Table 4 Involvement in the different procurement methods Table 7 Preference of respondents regarding compensation methods on design-build procurement Description Designers Contractors Traditional method Public sector projects 46% 37% Private sector projects 54% 63% Design-build method Public sector projects 14% 25% Private sector projects 86% 75% Other procurement methods Public sector projects 0% ..
Trends in undergraduate environmental engineering training and integration strategy for civil engineering at the University of Pretoria : technical paperSource: Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese 44, pp 2 –9 (2002)More Less
Environmental engineering and information technology (IT) are growth areas in the of civil engineering field. The South African Qualifications Authority (SAQA) (1998) and the Engineering Council of South Africa (ECSA) (1998) require that aspects of IT and environmental engineering be included in the curricula of engineering education. This is in line with a worldwide trend in engineering education. Recent SA environmental legislation elevated the issue of environment from one of 'general awareness' to a 'legal requirement' in the fields of planning, development and civil engineering practice. The University of Pretoria (UP) has, to date, offered environmental engineering and management modules primarily as postgraduate specialist studies. The Department of Civil Engineering and the Department of Agricultural and Food Processing Engineering recently merged as part of university-wide reorganisation and rationalisation of faculties and departments. The new Department of Civil and Biosystems Engineering thus formed utilised the strategic opportunity presented by the name change to investigate the extent to which environmental engineering can be accommodated as an independent undergraduate program in the restructured Civil Engineering and Agricultural and Food Processing Engineering curricula. A phased approach was chosen which included various electives in the new curricula from 2001.
Job creation possibilities by using round-end cut truss webs in the manufacture of timber trusses : technical paperSource: Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese 44, pp 10 –13 (2002)More Less
This paper discusses the concept of round-end cut webs for timber trusses. Punched steel gusset plates that are nailed by means of individual nails may be used for site assembly of trusses with round-end webs. Nailed gusset plate connections and full-scale truss test results are presented. Ways of improving the performance of nailed gusset plates are also suggested. The author points out that this method of truss assembly has advantages for the owner-builder and the small rural builder. In underdeveloped (Third World) countries, this method is particularly suitable because of its job creation possibilities.
The use of the correspondence principle towards the fatigue characterisation of asphalt concrete : technical paperSource: Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese 44, pp 14 –22 (2002)More Less
Prediction of the performance of asphalt concrete under realistic traffic conditions needs a sound understanding of the hysteretic stress-strain behaviour of asphalt concrete mixtures under repetitive traffic loading. Fatigue cracking caused by repetitive traffic loading is one of the major distresses in asphalt concrete pavement. The most common fatigue model relates the initial strain or stress levels applied during tests to the fatigue life, without taking into account damage evolution. As a result this fatigue model grossly underpredicts field fatigue life and the introduction of laboratory to field shift factors is necessary. The aim of this paper is, therefore, to introduce a methodology capable of predicting the fatigue performance of asphalt concrete considering damage evolution. Other aspects, such as difference in loading, the changing field environmental conditions, as well as different support conditions, which also necessitates the introduction of shift factors, fall outside the scope of the present research. The correspondence principle was used to achieve this objective, owing to its ability to separately evaluate the three major mechanisms that take place in the asphalt concrete when subjected to repetitive loading with various durations of rest periods: fatigue, which can be regarded as damage accumulation due to flow and crack propagation, relaxation of stresses, related to the viscoelastic nature of asphalt concrete, and chemical healing, across microcrack and macrocrack interfaces, during rest periods. Furthermore, the correspondence principle was used to derive a constitutive equation where damage mechanisms were accounted for. Finally, a fatigue prediction curve was derived based on this constitutive modelling approach. As a result, a higher fatigue life, in terms of number of load applications to failure, was obtained by using this methodology, indicating more realistic fatigue life prediction and less necessity for the use of shift factors. This paper is based on the MEng project report submitted to the University of Pretoria by the first author titled 'Fatigue characterization of asphalt concrete using viscoelasticity and damage theory'.
Author N.W. DekkerSource: Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese 44, pp 23 –27 (2002)More Less
Circular hollow sections are commonly used in lattice towers. The geometry of hollow circular sections provides particularly effective compression members. Fully developed welded end -connections are generally considered to be uneconomical and flattened end connections provide economical benefits and simple fabrication. The process of flattening the ends of circular hollow sections reduces the overall stiffness of the member and introduces eccentricities at the junctions. The reduction in stiffness and the influence of such eccentricities are not taken into account in the design process. This paper examines the influence of the flattened ends and the eccentricities and recommends a rational design process to account for such effects.
New timber column design equations - new formulations and modulus of elasticity values : technical paperAuthor W.M.G. BurdzikSource: Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese 44, pp 28 –32 (2002)More Less
Recent bending and compression tests on currently produced SA pine and low-density Eucalyptus saligna have shown that the fifth percentile modulus of elasticity, MOE, is lower than the values published in SABS 0163 (1994). These tests have shown that the fifth percentile values should be used when calculating the stability of timber columns and beams. Current editions of SABS 0163 (1994), however, use the mean modulus of elasticity to calculate column strengths. The author presents data and graphs to support his findings and proposes new sets of equations for column strength that look similar to the steel design code equations, found in SABS 0162-1(1993). He also suggests reduced fifth percentile modulus of elasticity values to be used for the calculation of compression member strength. Graphs are presented that show the good fit of the new proposed equations with the current accepted equations.