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Abstract(s)
Neste trabalho é estudada a ductilidade de vigas de betão armado submetidas à torção pura,
em particular vigas com secção retangular cheia e vazada.
Para tal, foi compilada informação sobre os resultados experimentais de vigas ensaiadas por
diversos autores e encontrados na literatura consultada. Ao todo, juntou-se informação
acerca de 120 vigas para este trabalho.
No início é feita uma análise comparativa do comportamento experimental das vigas de
referência com o comportamento global teórico previsto para as mesmas. Posteriormente é
feita a análise da ductilidade através da definição de um índice de ductilidade em torção.
Analisa-se e discute-se, de uma forma global, a influência de vários parâmetros
característicos das vigas na evolução da ductilidade. Em causa estão a resistência do betão à
compressão, a taxa total de armadura de torção, o desequilíbrio de armaduras, o fator de
escala da secção e o tipo de secção (cheia ou vazada).
Os vários resultados são confrontados com as previsões de alguns documentos normativos
internacionais, nomeadamente europeus, americanos e canadiano. É feita a verificação da
adaptação das disposições normativas com o comportamento último observado para as vigas
sujeitas à torção analisadas neste trabalho.
In this thesis the ductility of reinforced concrete beams under pure torsion is studied, particularly, beams with plain and hollow rectangular sections. For this, information about several experimental results of beams tested under torsion, from several authors found in the consulted literature, was compiled. In overall, information about 120 beams was gathered for this work. An initial comparative analysis is made between the experimental behaviour of the reference beams and their global expected theoretical behaviour. Afterwards, the ductility analysis is performed by defining a torsional ductility index. Then, the influence of several variable studies on the ductility is analysed and discussed, namely: the concrete compressive strength, the total reinforcement ratio for torsion, the unbalance level of reinforcement, the scale factor of the cross section and the geometrical section type (plain or hollow). The results are compared with the predictions of international standard codes, namely Europeans, Americans and Canadian. The confirmation of the normative clauses with the ultimate behaviour observed for reference beams under torsion is then analysed.
In this thesis the ductility of reinforced concrete beams under pure torsion is studied, particularly, beams with plain and hollow rectangular sections. For this, information about several experimental results of beams tested under torsion, from several authors found in the consulted literature, was compiled. In overall, information about 120 beams was gathered for this work. An initial comparative analysis is made between the experimental behaviour of the reference beams and their global expected theoretical behaviour. Afterwards, the ductility analysis is performed by defining a torsional ductility index. Then, the influence of several variable studies on the ductility is analysed and discussed, namely: the concrete compressive strength, the total reinforcement ratio for torsion, the unbalance level of reinforcement, the scale factor of the cross section and the geometrical section type (plain or hollow). The results are compared with the predictions of international standard codes, namely Europeans, Americans and Canadian. The confirmation of the normative clauses with the ultimate behaviour observed for reference beams under torsion is then analysed.
Description
Keywords
Ductilidade Em Torção Resistência à Torção Torção Vigas de Betão Armado