This thesis presents a refinement of the conventional theory of sheer deflection of beams in the elastic range. The author's theory allows for discontinuity of sheer distortions of sections in the vicinity of vertical loads and also for the effect of vertical compression of the beam at the point of application of the vertical load. The writer does not investigate normal and shearing stresses but deals only with the effects considered as they influence deflection. The theory was tested experimentally on an aluminum alloy I-beam and a rectangular steel beam. The beam was rested on three supports and the load was applied at two points symmetrical to the central support, producing a statically indeterminate condition. Due to smallness of sheer deflections, the comparison between the theories was made in terms of statically unknown reactions rather than deflections themselves. These reactions were calculated from strains determined experimentally. The reactions computed in conformity with the two theories were then compared with the ones found from the electric strain gage readings. Attempt was made to find experimentally the effect of the proximity of the load on the strain gage readings. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate

In this study, the feasibility of utilizing the spin casting technique with structural Fibre-Reinforced Polymer (FRP) tubes and eliminating steel reinforcement is explored for the first time. This would make spun-cast FRP tubes (SCFTs) desirable in pole applications, as they are relatively light-weight, protected from deicing salts and other elements by the tube, and have similar flexural resistance to the completely filled FRP tubes (CFFTs). This study evaluates the flexural and bond performances of SCFTs through experimental and analytical investigations. The experimental investigation included a total of nine beam specimens, approximately 330 mm in diameter and 2.85 m in length, tested in three and four-point bending. Glass-FRP (GFRP) tubes with different wall thicknesses and proportions of fibres in the longitudinal and hoop directions were used in eight specimens. One control specimen was cut from a conventional prestressed spun-cast pole and tested for comparison. Also, one specimen was essentially a control CFFT. The main parameters studied were tube laminate structure, concrete wall thickness, and the effect of additional steel rebar in SCFTs. The experimental investigation also included six push-off stub specimens tested to examine the bond behaviour of SCFTs. An analytical model predicting the flexural response of SCFT beams was developed, verified, and used in a parametric study to examine a wider range of tube laminate structures, concrete wall thicknesses and FRP tube thicknesses. The study demonstrated the feasibility of fabrication of SCFTs in conventional precast plants. SCFTs were shown to have similar flexural strength to conventional prestressed spun-cast poles of an equivalent reinforcement index but are less stiff due to the lower modulus of FRP and lack of prestressing. SCFTs with inner-to-outer diameter ratio (Di/Do) up to about 0.6 achieved the same flexural strength as the CFFT specimen. However, the parametric study showed that this optimum (Di/Do) ratio is dependent on tube thickness and laminate structure and is generally smaller in thicker tubes or tubes stiffer in the longitudinal direction. / Thesis (Master, Civil Engineering) -- Queen's University, 2007-04-19 15:49:45.19

Thesis--University of Minnesota, 1979. / Bibliography: leaves 37-39.

No description available.

The load-deflection behavior of a US Army Corps of Engineers available sandwich plates in three-point bending with glass phenolic facings and balsa wood core is being investigated under room and elevated temperatures. Test data on bending rigidity, critical interfacial failure (skin-to-core interface) and shear stress are collected and analyzed. The load-deflection curves plots up to the point of failure initiation are being studied. The effects of the span and the radius of the loading nose on the bending modulus and strength are examined systematically. Theoretical calculations from a modified beam theory of sandwich structure are applied and the effect of the shearing rigidity of the core is studied, and the propensity with respect to the span is also investigated. A finite element model is developed to study the flexural and stress analysis. Based on the results, this thesis proposes a desirable analytical approach that correlates theory with experiment as defined below.

Thesis (M.S.)--Ohio University, March, 2001. / Title from PDF t.p.

Thesis (M.S.)--Ohio University, November, 1993. / Title from PDF t.p.

Thesis (Ph. D.)--University of Texas at Austin, 2008. / Vita. Includes bibliographical references.

Thesis (Ph.D.)--University of Nebraska-Lincoln, 2009. / Title from title screen (site viewed July 21, 2009). PDF text: xv, 386 p. : ill. (some col.) ; 10 Mb. UMI publication number: AAT 3352204. Includes bibliographical references. Also available in microfilm and microfiche formats.

Thesis--University of Wisconsin-Madison. / Vita. Photocopy of typescript. Ann Arbor, Mich. : University Microfilms International, 1979. -- 21 cm. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 148-150).