No

No

No

No / This paper presents a numerical investigation into the behaviour of headed shear stud in composite beams with profiled metal decking. A three-dimensional finite element model was developed using general purpose finite element program ABAQUS to study the behaviour of through-deck welded shear stud in the composite slabs with trapezoidal deck ribs oriented perpendicular to the beam. Both static and dynamic procedures were investigated using Drucker Prager model and Concrete Damaged Plasticity model respectively. In the dynamic procedure using ABAQUS/Explicit, the push test specimens were loaded slowly to eliminate significant inertia effects to obtain a static solution. The capacity of shear connector, load-slip behaviour and failure modes were predicted and validated against experimental results. The delamination of the profiled decking from concrete slab was captured in the numerical analysis which was observed in the experiments. ABAQUS/Explicit was found to be particularly suitable for modelling post-failure behaviour and the contact interaction between profiled decking and concrete slabs. It is concluded that this model represents the true behaviour of the headed shear stud in composite beams with profiled decking in terms of the shear connection capacity, load-slip behaviour and failure modes.

No

Part A of two Project Reports; Part B can be found at: http://hdl.handle.net/11375/17692 / <p> A number of recently published papers have been critical of the values of CE and Cλ by the ICRU as absorbed dose conversion factors for ionization chambers used in electron or photon beams.</p> <p> This report examines the subject in light of these recent works. Presented is a review of both theoretical and experimental results published to date along with the results of experimental work carried out at this facility. The present study concentrated on the measurement of the absorbed dose conversion factors for electrons and 25 NW photons. It also attempted to determine how the conversion factors might be influenced by such factors as chamber design buildup cap thickness and composition, and phantom composition.</p> <p> Measurements were made using electrons with 10 to 32 MeV initial energy and a 25 MeV photon beam, all produced by a Sagittaire Model Therac 40 linear accelerator. Checks on the stability of the measurement system were made using a 60Co source. Fricke ferrous sulfate dosimetry was used for absorbed dose measurement in the determination of CE.</p> <p> The results of the study would indicate that there is little or no effect on the measured values of CE or Cλ introduced by either the sleeves or phantoms for the radiation qualities studied. The results of the absorbed dose conversion factor study would indicate that the values recommended by the ICRU are sufficiently accurate for use in most instances. The data would tend to support the arguement that if there is an error in one of the ICRU derivations, the error in theory lies in the CE determination rather than that for Cλ.</p> / Thesis / Master of Engineering (MEngr)

Two types of tests are reported in this thesis: (1) tests of push -out specimens and (2) tests of composite cellular T -beams. The components of the composite members tested were short lengths of steel I -beams and concrete ribbed slabs. The ribbed slabs were formed by the inclusion of cellular sheet steel decking. Various rib sizes were used by varying the cell height and cell width of the decking. The components of a specimen were tied together by stud shear connectors. The tests were made to investigate the influence of cell geometry on the behaviour of composite cellular members and to provide a rational approach to their design. / Thesis / Master of Engineering (MEngr)

<p> A detailed synopsis of the state-of-the-art in the field of the Structural Analysis of sandwich beams is presented. Deficiencies, inaccuracies, lack of clarity, and the imposition. of unnecessary assumptions of behaviour found -in the related bibliography are presented in a comparative fashion. A method of analysis with obvious advantages over the others studied in this thesis is derived, and its use is suggested. The presentation of all methods of analysis is made under the most general cases of dimensions and loadings to make them as applicable as possible to the common cases encountered in sandwich components for the building industry. </p> <p> Experimental work carried out on several materials with some potential to be used in sandwich members for buildings and the tests carried out on some sandwich beams and beam-columns are reported. </p> / Thesis / Master of Engineering (MEngr)

No description available.

No description available.