Banca de DEFESA: OLIMPIA LOURES VALE PUJATT

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : OLIMPIA LOURES VALE PUJATT
DATE: 10/07/2020
TIME: 14:30
LOCAL: Videoconferência
TITLE:

PARAMETRIC ANALYSIS OF DISTRIBUTION OF THE BENDING MOMENT AND SUPPORT REACTIONS DUE TO THE LIVE LOAD IN SKEWED BRIDGES OF DECKS WITH MULTIPLE GIRDERS AND SLABS

KEY WORDS:

Skewed Bridges; Crossbeams; Rigidity of the deck bridges; Finite Element Method.

PAGES: 148
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

The structural analysis of the bridges with skew longitudinal geometry presents greater complexity when compared to a straight bridge. Therefore, there is a 0shortage of research on the subject both nationally and internationally. The objective of this work was to perform a parametric study of the bending moment distribution according to the moving load and the support reactions in skew bridges made with grid and slab. To reach this purpose, numerical models were constructed for structural systems of bridges with trays in beams molded in loco and in slab, using the Finite Element Method using the computer program CSiBridge v21, in order to acheive: (a) the influence of the addition of supporting and intermediate crossbeams on the bending moment distribution and on the support reactions of skewed bridges with multiple grids and, (b) the distribution of bending moments and support reactions on the skewed bridges with slabs. The analysis proposal recommended by the American Association of State Highway and Transportation Officials (AASHTO LRFD, 2017) was also applied, in order to compare the results with those obtained in the modeling. The results showed in the situations of the orthogonal bridge with longitudinal girders a symmetrical distribution of the bending moment distribution factor (BMDF’s) due to the mobile load. In all the situations studied on the bridges with side members, with the introduction of the angle of skewed, changes occurred in the distribution of the bending moments. The global analytics of the support reactions due to the mobile load showed that in the orthogonal bridge models, the reactions were evenly distributed, presenting equal values for the supports positioned at the same distance in relation to the central axis. The introduction of obscurity generated an uneven behavior of the reactions, with an increasing trend towards the obtuse angle. For some models, the percentage variation between the support close to the obtuse angle and the support used as a reference, close to the acute angle reached almost 50%. In the hidden bridges in slab, in all the cases analyzed, the ix obscurity generated a significant reduction in the reaction of the support close to the acute angle, with an increasing trend towards the obtuse angle, presenting itself higher in the support closer to the obtuse angle. When the behavior of the bending moment was analyzed, it was also possible to observe a change in its behavior with the introduction of skews. In general, the Mx and My moment, in module, became larger close to the obtuse angle. Finally, the percentages and variations observed for the slab model were much higher than those observed in the grid models.

BANKING MEMBERS:
Presidente - 1515200 - JOSE NERES DA SILVA FILHO
Externo à Instituição - JOÃO DA COSTA PANTOJA - UnB
Interno - 2087565 - RODRIGO BARROS