Wzmacnianie konstrukcji żelbetowych stanowi jedną z najtrudniejszych i bardziej odpowiedzialnych dziedzin inżynierii budowlanej. W pracy przedstawiono problem projektowania słupów żelbetowych wzmacnianych taśmami i matami CFRP. W referacie opisano dwa modele teoretyczne opracowane przez Wanga oraz Camipone i Miraglia. Na podstawie własnych wyników badań zaproponowano rozszerzenie i modyfikację modelu, opracowanego przez Camipone i Miraglia.
EN
The strengthening of reinforced concrete structures is one of the most difficult and important tasks of civil engineering. The problem of designing the RC columns strengthened with CFRP composites has been presented in this paper. Two theoretical models elaborated by Wang and Camipone with Miraglia have been described. An expansion and modification of the model elaborated by Camipone and Miraglia has been proposed on the basis of own test results.
3
Dostęp do pełnego tekstu na zewnętrznej witrynie WWW
Under the action of earthquake, the reinforced concrete (RC) columns may subject to torsional moment, and the existence of torsion will change the failure mode of RC columns. Moreover, the torsional fracture of RC columns often presents a brittle fracture pattern, and thus may have an obvious size effect. In this work, a three-dimensional meso-scale simulation approach was utilized to study the torsional failure of RC columns. The influence of structural size, longitudinal reinforcement ratio, stirrup ratio and cross-sectional shape on torsional failure of RC columns was investigated. The results show that: (1) the tested RC columns show brittle failure patterns, the nominal torsional strength presents obvious size effect; (2) the longitudinal reinforcement presents little influence on the size effect; (3) columns with square cross-section present stronger size effect than the ones with circular shape; (4) stirrups can improve the torsional strength, while they would weaken the size effect on torsional strength. In addition, a novel size effect law that can describe the quantitative influence of stirrup ratio was established. Finally, based on the variable angle truss model, the formulas for calculating the pure torsional capacity of RC columns were modified, considering the quantitative influence of the stirrup ratio on the size effect.
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.