Bridge B421 is located on the R555 at km 5.03 on Section 01E between Witbank (now known as eMalahleni) and Middelburg in the province of Mpumalanga. It is a four-span bridge, with each span comprising a simply supported voided slab. The main and back spans are 15.85 m and 16.15 m respectively. The deck is supported on elastomeric bearings and has a pressfit seal as expansion joint at all the supports.
Ludeke Dam is situated 16 km northwest of Bizana in the Mbizana Local Municipality at the confluence of the Ludeke and kuNtlamvukazi Rivers. Its purpose is to store raw water for the Greater Mbizana Regional Bulk Water Supply Scheme, estimated at R900 m. Water will be pumped from the dam for 14 km, with a static lift of 300 m, to the Nomlacu Water Treatment Plant for purification and bulk distribution.
The aim of the testing was to compare the relative positives and negatives of the Butterfly Tie and the Crimped Tie with regard to water transfer, and tensile and compression strengths based on the Australian Code (AS 2699-1984) requirements, as these are more comprehensive. The motivation was because the Butterfly Tie has been promoted in cavity wall construction in South Africa for the following reasons: (i) the NHBRC (National Home Builders Registration Council) compels contractors to use the Butterfly Tie; and (ii) SABS 28:1986 and SABS 0164-1:1980 also compel the use of the Butterfly Tie, even though there is an anomalous statement in the specifications.
The book is a successful attempt at providing a practical design aid to practising engineers who already have familiarity with the topics discussed. It is based on the Eurocode. It is not clear why seismic design and vibration analysis were compiled together, since the design bases for the two are distinctly different (albeit dynamic in nature).
During December last year SAICE' 2011 President, Seetella Makhetha, attended the 44th annual conference of the Nigerian Society of Engineers (NSE) in Calabar, Nigeria, by invitation. The presidents of the Ghanaian, Cameroonian, Kenyan and Chadian institutions were also invited.
In response to SAICE 2012 President Martin van Veelen's call to transfer accumulated knowledge and experience to young engineers under the leadership of experienced engineers, SAICE Professional Development and Projects (SAICE-PDP) offers a Coach-a-Candidate service.