Banca de DEFESA: YNGRID RAYANE FREITAS DO NASCIMENTO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : YNGRID RAYANE FREITAS DO NASCIMENTO
DATE: 21/10/2021
TIME: 08:00
LOCAL: meet.google.com/tpe-pxiv-myc
TITLE:

Widened curved bridges: an analysis of the distribution of bending moments and shear forces due to the live load.

KEY WORDS:

Live Load. Concrete Strength. Curved Bridges. Bridge Widening. FEM.

PAGES: 214
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Estruturas
SPECIALTY: Estruturas de Concreto
SUMMARY:

A significant fraction of Brazilian bridges is at risk of becoming functionally obsolete and structurally deficient if they are not reinforced and widened to conform to the new dimensional and load patterns. Still, technical literature mainly focuses on designing and constructing new structures, leaving the field of bridge widening relatively unexplored. In this context, this research aims to analyze the distribution of bending moments and shear forces due to the mobile load in curved bridges that have undergone a process of widening. This approach allows an analysis of how the transverse variation of stiffness affects bending moment and shear force distribution. The study considered the variation of additional segment's concrete strength, curvature radius, girder number, and cross-section type, as well as diaphragm insertion, 72 models were developed. The results were based on Bending Moment (BMDF) and Shear Force Distribution Factor (SFDF), which were obtained through FEM, using the CsiBridge v22. The analysis considered the design truck in two different positions on the deck, constituting the load cases 01 and 02. Additionally, this work contemplates two approximated analytical methods (V-Load and M/R), whose results were confronted with those determined through FEM. In conclusion, the variations tend to grow with the strengthening of the additional segments. Regarding load case 02, in general, stresses relocate toward the additional and stiffer areas, relieving the original girders. However, concerning load case 01, more often than not, the additional internal girders also experience stress reduction, which is not desirable. In relation to the curvature radius, it was found that this parameter does not alter the effects provoked by transverse stiffness variation. Comparing the results from MEF with those from the V-Load Method, it was verified that the divergences tend to increase with the reduction of curvature radius. Also, this comparison is not significantly affected even in models with variable stiffness along the cross-section. The M/R method was found inadequate, considering that its results for the internal girders tend to be unconservative.

BANKING MEMBERS:
Presidente - 1515200 - JOSE NERES DA SILVA FILHO
Interno - 2087565 - RODRIGO BARROS
Externo à Instituição - GILBERTO GOMES - UnB
Externo à Instituição - LEANDRO MOUTA TRAUTWEIN - UNICAMP