published_or_final_version / Civil Engineering / Master / Master of Philosophy

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The overall objective of this thesis is to develop a methodology which can be used to investigate the in-service performance of reinforced concrete members subject to shear loading, in order to update assessments of the shear capacity (and therefore the remaining life) of reinforced concrete bridges. To achieve this end tests have been carried out on two types of reinforced concrete members under different types of loading, with the principal response measured being the relative displacement of the top and bottom faces of the member, which has been referred to throughout as the “through-depth displacement”. The first member tested was a two-span continuous beam containing some web reinforcement in its central shear spans. This was loaded in a series of cycles to progressively increasing peak loads, with a few cycles to lower peak loads being carried out after the application of the higher peak loads.

A Dissertation submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the Degree of the Master of Science / Drilled specimens from four types of rocks, namely Quartzite, Norite, Sandstone and Coal encountered in the South African mining environment were tested to determine their fracture toughness coefficients, using International Society for Rock Mechanics (I...) standards. The tests were conducted using a MTS servo-controlled testing machine in displacement control mode. (Abbreviation abstract) / Andrew Chakane 2018

A research report submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, in partial fulfilment of the requirements for the degree of Master of Science in Engineering. Johannesburg, 2016 / Since mining platinum started at Unki Mine in 2005, large and small geologically controlled falls of ground (FOG) have been problematic especially in 2011 where a FOG caused a fatality. This study is about determining the rock properties at Unki Mine and then using the results to design and recommend robust support to reduce the FOG problems that are continuously happening. The study analysed all the FOG data from the mine database from 2010 to 2015 using statistical methods. Rock properties of the hangingwall, ore zone and footwall were determined from the laboratory tests. The geological structures were also mapped carefully. The results were then used as input data to the numerical modelling softwares Phase2 and J-Block. The J-Block program was used to determine the number of keyblocks that were stable, unstable and failed with support in designated and specified bords. A probabilistic approach was used to evaluate the stable span with special reference from small to large hangingwall instabilities for different mining scenarios. It was found out using Phase2 that large spans at Unki Mine are possible provided appropriate and robust support system is adopted. To fully address the issue of FOG problem at Unki Mine, a probabilistic approach is recommended as this is considered to be more appropriate than a deterministic approach that has been the traditional design approach so far. / MT2017

This manuscript predicts the behavior of a doubly reinforced concrete beam with a circular opening at its midspan by closely analyzing traditional beam theory and design. It then confirms these predictions with finite element modeling software while providing design suggestions. The analysis is limited to the tensile and compressive stresses and cracking behavior. The objectives are to determine the stress distribution around a circular opening that agrees with conventional beam theory. The beam behavior is examined from zero load to failure load. ANSYS is utilized in lieu of real world testing, and the appendix includes the finite element results for a beam including design recommendations. The results lay the foundation for a possible new design procedure of concrete beams with single or multiple circular openings. This research offers useful information that was unavailable previously. More research can be conducted to help designers to design lighter, more efficient concrete beams. / by Heather R. Anesta. / Thesis (M.S.C.S.)--Florida Atlantic University, 2010. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2010. Mode of access: World Wide Web.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Includes bibliographical references. / by Vasantha Mohan Narendran. / M.S.

Thesis. 1975. M.S.--Massachusetts Institute of Technology. Dept. of Civil Engineering. / Includes bibliographical references. / M.S.