Título: | NUMERICAL ANALYSIS AND EXPERIMENTAL MECHANICAL BEHAVIOR OF UHPC BEAMS WITH OPTIMIZED CROSS-SECTION | ||||||||||||
Autor: |
PAULO HENRIQUE MARANGONI FEGHALI |
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Colaborador(es): |
FLAVIO DE ANDRADE SILVA - Orientador PABLO AUGUSTO KRAHL - Coorientador |
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Catalogação: | 11/NOV/2024 | Língua(s): | ENGLISH - UNITED STATES |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=68593&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=68593&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.68593 | ||||||||||||
Resumo: | |||||||||||||
Ultra-high performance concrete is a material which has been developed in the last
decades to fulfill modern structures need for a more resistant and durable material. Its
highly nonlinear characteristics in both tension and compression leads to a complex
behavior. In addition to that, the inhomogeneous distribution of the fibers and the high
tensile strength when compared to conventional concrete result in reduced ductility for
UHPC beams. Finite element analysis is shown to be an adequate tool to represent UHPC
structural element s response but the model calibration must be correctly applied and
coherent modeling techniques must be used to correctly model the post-peak branches of
load-displacement curves for UHPC beams subjected to four-point load bending tests. An
extensive material characterization in both tension and compression was conducted.
Monotonic axial tests were conducted to obtain stress-strain curves in compression and
stress-crack opening in tension and cyclic tests were made to determine the experimental
damage evolution in compression and in tension. These data served as input to calibrate
uniaxial models and damage evolution models according to analytical expressions
available in the literature. Heterogeneous models simulating the material dispersion of
the mechanical properties of the UHPC over structural beams were used to obtain a cross-section that presented optimized resistance while maintaining target ductility. Finally,
five beams were tested, with different shapes and reinforcement ratios and the modeling
strategies were benchmarked to the beams experimental data.
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