Issue 8, 1980 Civil Engineer in South Africa - Volume 22,
Issue 8, 1980 Navigate this Journal About Previous issues Volumes & issues
Elastic deformations of perspex model structures
Civil Engineer in South Africa 22, pp 211 –214 (1980)
An incremental deformation technique is presented for overcoming the problems inherent in the non-linear behaviour of perspex models. The results of model tests are used to show that if a model is loaded incrementally until the curve of incremental deformations becomes asymptotic, then its behaviour at that stage will for all practical purposes be perfectly elastic. The effect of temperature on the elastic behaviour of models is also considered.
&apos;n lnkrementale vervormingstegniek word aangebied wat die inherente probleem van nie-liniêre gedrag in perspeks-modelle oorkom. Die resultate van modeltoetse word gebruik om te toon dat indien die model inkrementaal belas word totdat die kurwe van inkrementale vervormings asimptoties word, die gedrag by daardie stadium, vir alle praktiese doeleindes, perfek elasties is. Die effek van temperatuur op die elastiese gedrag van die modelle is ook in ag geneem.
Administrasie van kwaliteitbeheer in die siviele ingenieurskonstruksiebedryf
C.J. Brown and
Civil Engineer in South Africa 22, pp 215 –217 (1980)
Enige beheerstelsel funksioneer deur die stel van &apos;n standaard, toetsing of daar aan die standaard voldoen word, gevolg deur regstellende maatreëls indien dit benodig word. Beheer impliseer ook die uitoefening van gesag wat egter in gelyke mate verantwoordelikhede en verpligtinge meebring. Die doelwitte van kwaliteitbeheer sowel as die verantwoordelikhede van die betrokke partye, nl die eienaar, die kontrakteur en die raadgewende ingenieur, word nagegaan. Remediërende stappe, asook moontlike koste-implikasies, weens werk wat nie die nodige kwaliteit bereik het nie, word aangedui. Aangesien kwaliteitbeheer deel is van die praktiese implementering van &apos;n ontwerp, is dit net so belangrik as die ontwerp en behoort dit slegs aan genoegsaam ervare personeel toevertrou te word.
Any control system functions through the setting of a standard, testing whether the standard has been attained and, if warranted, the taking of corrective action. Control implies the exertion of authority but reciprocates equally with responsibilities and obligations. The purpose of quality control as well as the responsibilities of each party concerned, namely the owner, the contractor and the consulting engineer, are explored. Remedial steps, including possible cost implications, due to work which has failed to achieve the specified quality, are discussed. Because quality control forms a major part of the practical implementation of a design it is equally important and should be entrusted to sufficiently experienced personnel only.
Design and construction of the Lukasrand microwave tower, Pretoria : discussion
I read C M McMillan&apos;s paper with interest. The unusual architectural features of the structure remind me of arguments used by F Leonhardt in an article I read several years ago.