Banca de DEFESA: PEDRO MITZCUN COUTINHO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : PEDRO MITZCUN COUTINHO
DATA : 11/10/2019
HORA: 14:30
LOCAL: A definir.
TÍTULO:

Comparative numerical analysis between integral and conventional

reinforced concrete bridges subject to indirect actions of temperature,
shrinkage and creep.

PALAVRAS-CHAVES:

Integral Bridges; Integral Abutment Bridges; Thermal Effects; Creep;

Shrinkage; Time Dependence.

PÁGINAS: 232
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
RESUMO:

This research presents a comparative study between the structural
behavior of reinforced concrete integral bridges and a conventional
bridge, in order to analyze the variation of efforts and displacements
generated in the structure due to indirect actions such as creep, shrinkage
and temperature variation. To do this, the soil deformability through soil-
structure interaction (ISE) was considered using p-y curves where the
neighboring soil is represented by a set of horizontal springs with
nonlinear behavior. In addition, a three-dimensional numerical analysis
of three-span bridges was performed using a software based on Finite
Element Method (FEM), analyzing 03 (three) different structural
systems: (a) integral bridge; (b) integral abutment bridge and (c)
conventional bridge, the latter consisting of isostatic spans separated by
expansion joints. Finally, a comparison was made between the results
obtained with the integral bridge systems and the conventional bridge
and a comparison of the results obtained from the FEM with analytical
models, using NBR 6118 (2014), NBR 7187 (2003) and NBR 7187
(1987) to check temperature action and the Eurocode 2 (2004) model for
creep and shrinkage. The results showed that the thermal gradient action
resulted in significant negative bending moments in the bridge end
regions, especially in the abutment region, where the moment presented
its maximum absolute value. Regarding the creep and shrinkage effects,
for both types of integral systems studied, it was found that these actions
caused unfavorable effects in the bridge end span generating the addition
of significant bending moments, with maximum percentage variation of
9.3%. In the abutment section, this effect was favorable, resulting in a
reduction in the absolute value of bending moment, with a maximum
percentage variation of 22.8%. However, although favorable, a greater
influence of rheological effects on the ends of integral bridges was
noticed. Finally, by analyzing the displacements in the end span of each
model, it was possible to verify that the amplification factor of the
deformations was always higher for the integrals bridges models,

showing that in this structural system, the effects of creep and shrinkage
are more significant and should be taken into account in the design.

MEMBROS DA BANCA:
Externo à Instituição - SERGIO HAMPSHIRE DE CARVALHO SANTOS - UFRJ
Presidente - 1515200 - JOSE NERES DA SILVA FILHO
Interno - 2087565 - RODRIGO BARROS