Thesis (MScEng)--Stellenbosch University, 2011. / ENGLISH ABSTRACT: A construction method that proves to be the best today will not necessarily be the best method for
application in 20 years. Therefore, with changing circumstances, engineers have to consider all
the options before selecting a specific method. Options that are weighed in this study are in-situ
concrete construction and hybrid concrete construction.
Hybrid concrete construction is the combination of in-situ and precast concrete in structures, with
the purpose to exploit the advantages of each to its full potential. This construction method gained
popularity in the United States and in Europe due to its distinctive benefits. However, the increase
of its application in some countries (including South Africa) has been slow and possible reasons for
this are investigated in this study. With the intention of improving the South African construction
industry, a model is developed for decision making between hybrid concrete construction and insitu
concrete construction.
The main purpose of a larger research project is to assist project teams in the decision making
between precast concrete and in-situ concrete in building construction projects. This decision
making is not based on decision making models with mathematical output, since the decision of a
construction method is influenced by many variables that may not all be quantifiable.
Consequently, instead of prescribing a decision making method, the relevant information is to be
provided for the decision maker. The aim of this study is to identify the relevant parameters and to
set a framework for further in depth investigation by subsequent theses.
A decision making process in any field normally involves having a list of advantages and
disadvantages of the different options. Therefore this study includes the following managerial
discussion topics: factors that influence hybrid concrete construction, as well as benefits, barriers
and other aspects to consider, structural systems and elements, decision making methods and
important factors that will be the basis of the decision making process.
Traditionally the most important factors for decision making between construction methods were
construction cost and duration, but more recently sustainability is becoming increasingly important.
It is the civil duty of all parties involved in a project to foresee that most of the criteria of
sustainability are met. Sustainability covers all the aspects of economic, social and environmental
impacts. Furthermore quality is identified as an important aspect in the decision making process
for a construction method. The comparison of precast and in-situ concrete construction is
therefore discussed, considering all the abovementioned criteria and investigating possible
quantification methods. This information, together with information from future studies, would then
allow the project team to consider each aspect involved in the decision making process. / AFRIKAANSE OPSOMMING: Die beste konstruksiemetode vandag sal nie noodwendig die beste metode oor 20 jaar wees nie.
Met veranderende omstandighede, moet ingenieurs altyd al die moontlike opsies oorweeg voordat
‘n spesifieke konstruksiemetode gekies word. Opsies wat in hierdie studie bestudeer word, is in-situ betonkonstruksie en hibriede betonkonstruksie. Hibriede betonkonstruksie is die kombinasie van in-situ en voorafvervaardigde beton elmente in strukture, ten einde die voordele van elke metode ten volle te benut. As gevolg van sy voordele,
het hierdie konstruksiemetode al hoe meer gewild geraak in Amerika en Europa. Nietemin is die
toename in die gebruik van hierdie metode in sommige lande (insluitend Suid-Afrika) traag en
moontlike redes hiervoor word in hierdie studie ondersoek. Met die voorneme om die Suid-
Afrikaanse konstruksie-industrie te bevorder, is ‘n model vir besluitneming tussen hibriede
betonkonstruksie en in-situ betonkonstruksie ontwikkel. Die hoofdoel van ‘n groter navorsingsprojek is om projekspanne te help met die besluitneming
tussen voorafvervaardigde en in-situ beton in konstruksieprojekte vir geboue. Hierdie besluitneming is nie gebaseer op besluitnemingsmodelle wat wiskundige resultate lewer nie, want
die keuse van ‘n konstruksiemetode word deur te veel veranderlikes, wat nie altyd kwantifiseerbaar
is nie, beïnvloed. Gevolglik word relevante inligting aan die besluitnemer verskaf, eerder as om ‘n
gekwantifiseerde besluitnemingsmetode voor te skryf. Die doel van hierdie studie is om relevante
aspekte te identifiseer en om ‘n raamwerk te skep vir verdere, in diepte studies van volgende
tesisse. ‘n Besluitnemingsproses in enige veld word gewoonlik gebaseer op ‘n lys van voordele en nadele
van die verskillende opsies. Daarom sluit hierdie studie die volgende bestuursaspekte in: faktore
wat hibriede betonkonstruksie beïnvloed, asook voordele, beperkings en ander aspekte om te
oorweeg, strukturele sisteme en –elemente, besluitnemingsmetodes en belangrike faktore wat die
basis van die besluitnemingsproses sal wees. Tradisioneel was die belangrikste faktore vir besluitneming tussen konstruksiemetodes die koste
en tydsduur daaraan verbonde, maar deesdae word volhoubaarheid al hoe meer belangrik geag.
Dit is die plig van alle persone betrokke by ‘n projek om te sorg dat die projek aan so veel as
moontlik van die kriteria van volhoubaarheid voldoen. Volhoubaarheid sluit al die aspekte van
ekonomiese-, sosiale- en omgewingsimpakte in. Verder is kwaliteit ook geϊdentifiseer as ‘n
belangrike aspek in die besluitnemingsproses van ‘n konstruksiemetode. Die vergelyking van
voorafvervaardigde- en in-situ betonkonstruksie word dus bespreek met die oog op al die
bogenoemde kriteria en, sover moonlik, word die kwantifisering van hierdie aspekte ondersoek. Met hierdie inligting en die inligting van toekomstige studies, kan die projekspan dan elke aspek in
die besluitnemingsproses oorweeg.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/17804 |
| Date | 12 1900 |
| Creators | Lombard, Adele |
| Contributors | Wium, J. A., Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering. |
| Publisher | Stellenbosch : Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | Unknown |
| Type | Thesis |
| Format | 93 p. : ill. |
| Rights | Stellenbosch University |
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