Browsing by Author "King, W H"

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    An analysis of residential trip generation in Cape Town
    (1974) Pas, Eric Ivan; King, W H
    Some of the factors contributing to the growth of a 'transportation problem' in Cape Town are outlined, and the main trends are illustrated. A brief introduction to the Urban Transportation Planning Process is presented, and the importance of the trip generation sub-model within the conventional traffic forecasting model is highlighted. A review of past and current practice in the analysis of residential trip generation is presented. The least-squares and category analysis techniques are compared, and the dummy variable method is briefly described. The unit of analysis to be used in the development of residential trip generation models is discussed. The independent variables frequently incorporated in models of residential trip-making are examined, and their effects on home-based trip generation are analysed. Some of the problems associated with the development of regression models are examined. The planning and execution of a home questionnaire survey of households in the Cape Town area is described.
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    Open Access
    The effects of elevated temperature on the bond between concrete and reinforcing steel bars
    (1974) Cawood, Robin John; King, W H
    This investigation forms part of a larger programme undertaken to determine the mechanical, thermal, and time dependent property behaviour of concrete subjected to elevated temperature. A literature review covering the mechanics of bonding, viz. chemical adhesion, frictional effects and mechanical interaction is presented. Parameters which influence bond are discussed. These are properties of the steel reinforcing bar, properties of the concrete, embedment length, casting position of the reinforcing bar and temperature. The research reported herein is primarily concerned with the effects of elevated temperature on the bond between concrete and steel. In this regard, a pullout bond test was used.
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    Modal split analysis for the journey to work
    (1974) Aplin, William Neil; King, W H
    The choice of travel mode for the journey to work is an important aspect in the planning of adequate transportation systems in urban areas. This choice process is complex and consequently a generalized theoretical basis for modal choice is difficult to construct. Nevertheless, empirical modeling of modal choice behaviour has enabled transportation planners to predict future travel demands for different modes. Furthermore, such models have led to a body of knowledge which has allowed researchers to explore the modal choice decision on a more theoretical basis. This study involves the analysis of the modal choice process for White commuters in Cape Town. The investigation of the role of modal split in transportation planning is provided to illustrate the relevance of this sub-process in the overall transportation planning process. An investigation of some of the theoretical and applied literature in this field indicates, that to obtain suitable and simple planning tools for modal split analysis, an empirical approach to modelling is probably the best alternative. The theoretical approaches are still in an embryonic stage and require more research before they offer a practical solution to modal split modelling. The data collection technique used in this study involved the distribution of a questionnaire survey to a sample of employees at their workplace. The technique provided an excellent response rate and can be performed with a minimum of resources. Other detailed travel time studies are described and once again all appreciable amount of data was able to be collected with a minimum of funds and manpower.