Analytical Study on Prestressed Steel I-Beam Strengthened in Compression by Angles

Raju, P.; Vipparthy, Ravindra

doi:10.1007/s40030-013-0049-4

Cited by 2 publications

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“…The experimental results showed that the prestressing efficiency of steel beams with corrugated webs increased more significantly than that of the steel beam with a typical web, and it is verified that the proposed methods are very simple and provide good agreements with the experimental results. Ponnada and Vipparthy (2013) [36] compared the performance of prestressed steel I-beam and that strengthened in compression by welding two angles. The study of the variation among different parameters revealed that the load carrying capacity is not directly proportional to the prestressing force in case of an unsymmetrical I-section for eccentricities less than a minimum value.…”

Section: Literature Reviewmentioning

confidence: 99%

Computerized Optimum Dimensioning of Prestressed Homogenous Steel I-Beam

Raju¹,

Vipparthy²

2017

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Abstract. The economy of a prestressed steel beam can be realized only when relevant parameters of optimum magnitude are chosen. The present work aims at finding out the optimum dimensions of a simply supported, laterally unsupported, prestressed steel Ibeam for a given span and load carrying capacity. The span of the beam was limited to 12 m while the load carrying capacity was limited to 100 kN/m in this study. A straight tendon configuration over the whole span is considered and the losses occurring in the tendon are neglected. The safety of various sets of dimensions ranging from the minimum dimensions of I-section in IS-Hand Book-1 to their maximum dimensions for different pre-stressing forces and eccentricities are checked. The set with minimum cross sectional area is chosen. Iterative calculations involved in analysis were performed with the help of a 'C' program developed by the authors in Turbo 'C' Environment. It was observed that the ratio of top fiber stress at working loads to the permissible stress is more than 0.9 for all the spans for the finalized cross-sections. This means that the cross-section is being effectively utilized. For a given load carrying capacity and span, eccentricity to depth ratio has to be in between 0.45 to 0.7 for optimum utilization of the available cross section. It is also observed that the maximum pre-stressing force equal to 0.25 times the permissible bending compressive stress can be applied.

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Section: Literature Reviewmentioning

confidence: 99%