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dc.contributor.authorParekh, Jagannath P.en
dc.date.accessioned2019-02-15T14:15:49Z
dc.date.available2019-02-15T14:15:49Z
dc.date.issued1927
dc.identifier.urihttp://hdl.handle.net/1842/33453
dc.description.abstracten
dc.description.abstractThe main object of these experiments was to determine how columns behave before collapse under axial loading. The original title of the research was "An investigation into the factors determining the strength of built-up steel struts". The title had to be amended as the testing machines necessitated the use of "model" sections.en
dc.description.abstractIn mathematical investigations the columns considered are taken as ideal, and therefore materially different from actual columns. To some extent this difference could be attributed to the difference between theoretical assumed conditions of elasticity and those found in actual metals as manufactured. A more important cause of the difference is the varying nature of the end conditions employed. The results of the accurate researches of such men as Tetmajer, Hodgkinson, Christie and Howard, who brought with them not only ripe experience but careful and clear methods of experimenting are a testimony to the difficulty of reconciling theory and experiment.en
dc.description.abstractIn the enthusiasm generated more than 150 years ago by the work of Euler, mathematical formulae were established with the purpose of making allowance for the imperfections existing in a practical column. So far a 3 the author is aware the subject has been treated only mathematically and no one has approached it experimentally, except to determine the effects of the direct eccentricity of loading. Despite the many minute mathematical investigations made, the comparative accuracy and even the validity of them is still doubtful. The a uthor’s discussions on the "Imperfection tests" show that the only variant of noteworthy consequence is the eccentricity of loading: the other imperfections, unless of a critical magnitude, having practically negligible effects on the ultimate strength of a column.en
dc.description.abstractAmong the most notable features of the au t h o r ’s work could be considered the collective view of the stress-strain diagrams, thejintroduction of the virtual coefficients of elasticity, the definite divisions of the column graph, quantitative data about "permanent set", "imperfection tests" and the method for the adequate allowance in area due to rivet holes in a built-up piece.en
dc.description.abstractThe bending formulae determined for long columns represent more accurately most of the experimental results. The yield range,- represented by a straight line law,- has not been definitely formulated. This is due to the fact that the exact values of the critical compressive and the tensile stress determining the range were not known with sufficient accuracy for the materials used by the earlier experimenters. No one, except Robertson, has carried out crushing tests with a view to determine the exact compressive stress-strain relations. It can be stated that the yield range will be represented by an equation of the formen
dc.description.abstractp = A + B - Cx2/k , where A - a constant depending on the material. B = a constant depending on the end conditions, C =a reducing factor depending on the end conditions.en
dc.description.abstractThe behaviour of built-up columns has been the subject of world-wide discussion. The author’s views regarding the "non-homogeneous" action of the columns and the reduction in area for rivet holes are fully described in this Thesis.en
dc.description.abstractThough the present investigations embrace only a’”limited part of the vast field of experimental columns, the author feels that similar methods applied to full-sized sections will give results of value to the practical designer. A programme of column tests should include not only tension tests but also crushing tests with a view to determine the primary stress-strain relations. More "rivetreduction" experiments are needed to test the conclusions arrived at for the adequate allowance in area due to rivet holes.en
dc.publisherThe University of Edinburghen
dc.relation.ispartofAnnexe Thesis Digitisation Project 2019 Block 22en
dc.relation.isreferencedbyen
dc.titleOn the strength of columnsen
dc.typeThesis or Dissertationen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePhD Doctor of Philosophyen


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