Girders with corrugated steel web are preferred and widely used in recently constructed bridges and industrial buildings. Sandwich core girders with corrugated web are constructed by adding two plates (skins) to the corrugated web. This study aims to investigate the shear span-to-depth ratio impact on the performance of sandwich core steel girders with corrugated web. Three span-to-depth ratios (a/d): 1.0, 1.833 and 2.5, were examined. The test includes three girders with sandwich web thickness of 30 mm, three girders with 60 mm sandwich web thickness, and three girders with conventional flat webs. A total of nine simply supported steel girders subjected to a concentrated load were fabricated and tested up to failure. The responses of the examined girders are presented in term of the load deflection curves, the ultimate load, and the maximum displacement. Among the conclusions drawn in this study that girders with sandwich core thickness of 30 mm demonstrate higher ultimate load capacity than girders with sandwich core of 60 mm, the maximum difference in the ultimate load capacity was about 20% and can be seen at a/d equals to 1.0. The results also pointed out that the behavior of the beams was noticeably impacted by the shear span-to-depth ratio.
ResumoHigh strength concrete (HSC) has found many applications in civil engineering structures such as in high-rise buildings, and bridges. The mechanical properties of HSC are sometimes different than of normal strength concrete (NSC). In particular, HSC possess lower creep strains compared to NSC. As a result, members constructed using HSC have been found to deflect less under sustained long-term loads. However, formulas used by current codes of practice such as ACI (318) code and Australian standard (AS-3600) for predicting the long-term deflections don't account for effects of HSC. This study aims to present a theoretical formula to calculate the long-term deflections for reinforced concrete beams made from NSC and HSC, taking into account the influence of HSC. The formula was derived from curve fitting analysis of long-term deflections obtained from several experimental tests available in literature. The presented equation considers the effects of several factors, such as compressive strength of concrete, and reinforcement at compressive zone, found in the experiments to have a significant impact on long-term deflections. The results of the equation were compared with experimental results of other researchers, and a good agreement was obtained. Following a parametric study, the long-term deflections were found to decrease to about 50% when increasing the concrete's compressive strength from 20 to 100 MPa. The compressive steel reinforcement was found less effective in the case of HSC.El hormigón de alta resistencia (HSC) ha encontrado muchas aplicaciones en estructuras de ingeniería civil, como en edificios de gran altura y puentes. Las propiedades mecánicas de HSC son a veces diferentes de hormigón de fuerza normal (NSC). En particular, HSC posee cepas de fluencia más bajas en comparación con la NSC. Como resultado, los miembros construidos con HSC se han encontrado para desviar menos bajo cargas sostenidas a largo plazo. Sin embargo, las fórmulas utilizadas por los códigos de práctica actuales, como el código ACI (318) y el estándar australiano (AS-3600) para predecir las desviaciones a largo plazo, no tienen en cuenta los efectos de HSC. Este estudio tiene como objetivo presentar una fórmula teórica para calcular las deflexiones a largo plazo para vigas de hormigón armado hechas de NSC y HSC, teniendo en cuenta la influencia de HSC. La fórmula se derivó del análisis de ajuste de curvas de las deflexiones a largo plazo obtenidos de varias pruebas experimentales disponibles en la literatura. La ecuación presentada considera los efectos de varios factores, como la resistencia a la compresión del hormigón, y el refuerzo en la zona de compresión, que se encuentra en los experimentos para tener un impacto significativo en las deflexiones a largo plazo. Los resultados de la ecuación se compararon con los resultados experimentales de otros investigadores, y se obtuvo un buen acuerdo. Después de un estudio paramétrico, se descubrió que las deflexiones a largo plazo disminuían a aproximadamente 50% cuando aumentaba...
Steel coupling beam (SCB) is a substantial member of the hybrid coupled walls system. When coupled walls are linked by SCB rather than conventionally reinforced or diagonally reinforced coupling beams, the system's strength and energy dissipation capacities are greatly enhanced. A corrugated web may be used in SCB instead of a flat web o improve these characteristics even more. This paper presents an experimental and numerical investigation of the shear-carrying capacity and energy-dissipating capability of steel coupling beams with both types of webs (flat and corrugated). Full-scale specimens of hybrid coupled walls with SCB made with flat web and SCB with corrugated web were prepared and tested under monotonic loading. Finite elements software (ABAQUS) was used to implement the numerical analysis. Good agreement was noticed between the experimental and the numerical results. The results of this study are promising that to the possibility to enhance the load-carrying and ductility capacities of SCB using a corrugated plate instead of a flat plate as a web.
Steel coupling beam (SCB) is a substantial member of the hybrid coupled walls system. When coupled walls are linked by SCB rather than conventionally reinforced or diagonally reinforced coupling beams, the system's strength and energy dissipation capacities are greatly enhanced. A corrugated web may be used in SCB instead of a at web o improve these characteristics even more. This paper presents an experimental and numerical investigation of the shear-carrying capacity and energy-dissipating capability of steel coupling beams with both types of webs ( at and corrugated). Full-scale specimens of hybrid coupled walls with SCB made with at web and SCB with corrugated web were prepared and tested under monotonic loading. Finite elements software (ABAQUS) was used to implement the numerical analysis.Good agreement was noticed between the experimental and the numerical results. The results of this study are promising that to the possibility to enhance the load-carrying and ductility capacities of SCB using a corrugated plate instead of a at plate as a web.
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