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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 47, Issue 2, 2005
Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese - Volume 47, Issue 2, 2005
Volumes & issues
Volume 47, Issue 2, 2005
The need for construction health and safety (H&S) and the Construction Regulations : engineers' perceptions : technical paperSource: Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese 47, pp 2 –8 (2005)More Less
International research indicates that clients, designers, project managers, and quantity surveyors influence and can contribute to H&S. <br>The promulgation of the South African Construction Regulations in July 2003 has realised client, designer, and quantity surveyor responsibility for H&S. Clients are required to - inter alia - provide the principal contractor (PC) with an H&S specification and ensure that PCs have made adequate allowance for H&S. Designers are required to - inter alia - provide the client with all relevant information about the design, which will affect the pricing of the works, inform the contractor of any known or anticipated dangers or hazards, provide the contractor with a geo-science technical report, and the methods and sequence of construction, and modify the design where dangerous procedures would be necessary, or substitute hazardous materials. <br>Given the implications of the Construction Regulations, and the opportunity presented by the presentation of a national series of Construction Regulations seminars, a survey was conducted to determine the perceptions of primarily engineering delegates. <br>Findings include that: contractors predominate in terms of the perceived extent to which stakeholders can contribute to H&S; the implementation of quality management systems (QMSs) would complement construction H&S; client satisfaction predominates in terms of the importance of various project parameters, followed by quality, cost, and time; productivity and time predominate among parameters negatively affected by inadequate H&S; approximately 61 % of respondents stated that the Construction Regulations would result in between an improvement to major improvement / major improvement in H&S.
Practical choice of thermal comfort scale and range in naturally ventilated buildings in South Africa : technical paperSource: Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese 47, pp 9 –14 (2005)More Less
The paper reviews human thermal comfort scales for naturally ventilated buildings. It compares the neutrality temperatures based on the new effective temperature (ET) with that based on the dry bulb (DB) temperature and provides the motivation why the DB base is preferable, given the relatively favourable South African climate conditions and the ease of calculation. It also investigates the most recent research developments in adaptive comfort neutrality temperatures and their ranges. These are applied to South African conditions to produce realistic and cost-effective target design temperatures for naturally ventilated buildings of two classes of stringency.
Source: Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese 47, pp 15 –20 (2005)More Less
To evaluate the liquefaction potential of tailings impoundments, the in situ void ratio and the effective stresses are required. While stresses can be estimated with relative accuracy, the void ratio of tailings has proved difficult to obtain, especially below the water table. The development of in situ seismic techniques has presented new opportunities to determine the in situ void ratio of geomaterials. In addition, these seismic methods can be used to evaluate the liquefaction potential of gold tailings. However, the method currently relies on the shear wave velocity-void ratio relationships developed for sands, while gold tailings is essentially a silty material. This raises the question of the validity of such relationships for tailings material. A triaxial apparatus was modified to accommodate bender elements and the shear wave velocity of gold tailings was determined at various void ratios and effective stresses. The results show that there is a relationship between void ratio and the normalised shear wave velocity of gold tailings. They also show that the shear wave velocity for gold tailings is more sensitive to changes in effective stress than to changes in void ratio and that the shear wave velocity is virtually independent of the overconsolidation ratio. Application of the shear wave velocity-void ratio relationship in conjunction with critical state theory indicates that at the same shear wave velocity, gold tailings have a lower susceptibility to liquefaction than sands.