FRCU - GIMCE: Grupo de Investigación de Mecánica Computacional y de Estructuras - Artículoshttp://hdl.handle.net/20.500.12272/8082024-03-28T08:23:09Z2024-03-28T08:23:09ZMechanical behavior of reinforced concrete hybrid beams made with normal concrete, foamed cellular concrete and fber reinforced foamed cellular concretehttp://hdl.handle.net/20.500.12272/101692024-03-27T11:13:53Z2023-10-13T00:00:00ZMechanical behavior of reinforced concrete hybrid beams made with normal concrete, foamed cellular concrete and fber reinforced foamed cellular concrete
Cellular concrete has increased in popularity in the construction industry due to its particular characteristics. It is classifed as lightweight concrete and its structural behavior is consistent with this defnition, showing less rigidity and more brittleness
compared to normal concrete. In this work, experimental results obtained through bending tests on hybrid beams formed by two layers, one of normal concrete and the other of foamed cellular concrete, reinforced with polypropylene fbers, are presented. In this way, it was sought to increase the rigidity of the elements subjected to bending, through the incorporation of the normal density concrete layer and, in addition, to reduce the fragility of the foamed cellular concrete, through the addition of polypropylene fbers. Furthermore, the interface between both layers was treated with chemical glue for concrete, to achieve a better structural behavior of the elements. Characterization of the materials used was also carried out. In this way, the mechanical properties of the diferent concrete are analyzed and compared and the bending behavior of the hybrid beams is evaluated. Conclusions are drowned.
2023-10-13T00:00:00ZEstudio numérico probabilístico de la capacidad resistente de tubos de HRFA con distribución aleatoria de fibrashttp://hdl.handle.net/20.500.12272/101042024-03-26T15:35:25Z2023-04-10T00:00:00ZEstudio numérico probabilístico de la capacidad resistente de tubos de HRFA con distribución aleatoria de fibras
En este trabajo, se presenta un estudio numérico para evaluar la capacidad de carga de tubos de HRFA considerando una orientación y distribución de fibras aleatoria. Para ello, se simuló el ensayo de tres aristas a través de un modelo de elementos finitos 3D en combinación con el método de Monte Carlo. Las fibras son representadas como elementos discretos distribuidos aleatoriamente en
la masa de hormigón. El fenómeno de arrancamiento es considerado a través de una modificación del modelo constitutivo del acero. Además, se realizó un estudio paramétrico considerando variaciones en el dosaje de fibras y la clase de hormigón. Los resultados mostraron que la aleatoriedad en la distribución y orientación de las fibras afecta significativamente la carga máxima alcanzada con los tubos de HRFA. Sin embargo, esta carga máxima no varía sensiblemente cuando la distribución sigue una función de probabilidad uniforme, siendo la clase de hormigón el parámetro predominante.; In this paper, a numerical study is carried out to assess the bearing capacity of SFRC pipes considering random orientation and distribution of the fibers. For this purpose, the three edge bearing test (TEBT) is simulated through a 3D finite element model in
combination with the Monte Carlo method. The fibers are represented as discrete elements randomly distributed in the concrete mass. The pull-out phenomenon is considered by means of a modification of the steel constitutive model. In addition, a parametric study considering variations in the dosage of fibers and concrete class is conducted. Results shown that the randomness in the distribution and orientation of the fibers significantly affects the maximum load achieved by SFRC pipes. However, this maximum load does not vary significantly when the fiber distribution follows a uniform probability function; in this case the concrete class is the predominant parameter.
2023-04-10T00:00:00ZAnálisis experimental del comportamiento mecánico de tubos de hormigón reforzado con fibras híbridashttp://hdl.handle.net/20.500.12272/100992024-03-26T14:53:03Z2022-03-09T00:00:00ZAnálisis experimental del comportamiento mecánico de tubos de hormigón reforzado con fibras híbridas
El hormigón reforzado con dos o más tipos fibras se denomina hormigón reforzado con fibras híbridas (HRFH). En este trabajo se evalúa el desempeño mecánico del HRFH, de acero y de polipropileno, en su aplicación en tubos de 600 mm de diámetro. Para ello, se determinan experimentalmente, a través del ensayo de compresión diametral, la capacidad de carga y el modo de falla de tubos de
HRFH (THRFH) elaborados con dos dosificaciones distintas de fibras. Los resultados son comparados con los obtenidos del ensayo de tubos de hormigón reforzado con fibras de acero (THRFA), también elaborados con dos dosificaciones distintas de fibras, y tubos de hormigón armado (THA) con armadura tradicional de barras de acero. Los THRFH con las dosis de fibras híbridas utilizadas alcanzaron una resistencia equivalente a los THA y, además, mostraron un modo de falla dúctil, sin desprendimiento de hormigón o aplastamiento diametral luego de la rotura.; Concrete reinforced with two or more types of fibers is called hybrid fiber reinforced concrete (HFRCP). In this paper, the mechan- ical performance of HFRC, steel (SF) and polypropylene (PPF), in their application in 600 mm diameter pipes is evaluated. For it, the bearing capacity and failure mode of HRFH (HFRCP) pipes, elaborated with two different fiber dosages, are experimentally determined by means of the diametral compression test. The results are compared with those obtained from the test of steel fiber reinforced concrete pipes (SFRCP), also elaborated with two different fiber dosages, and reinforced concrete pipes (RCP) with tra-ditional steel bar reinforcement. The HFRCP, with the doses of hybrid fibers used, reached a load capacity equivalent to the RCP and, in addition, they showed a ductile failure mode, without concrete detachment or diametral crushing after failure.
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