Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Rock-filled concrete columns under axial loads
Rock-filled concrete (RFC) was initially developed in China primarily for large-scale structures, particularly hydraulic structures. However, it raises questions about its suitability for use in more straightforward structural elements, such as columns. The challenges lie in determining the construction sequence methods and assessing its filling capacity when applying RFC to these structural components. This study investigated the behavior of 10 RFC columns under axial loading in terms of their mechanical properties through experimental and numerical analyses. The optimal design of a self-compact concrete (SCC) mix to fit the components of the structural elements was studied, and then the sequence of RFC column construction was proposed. A modified random rock model of RFC columns based on their position and rotation as an ellipsoid was developed. This model considers the mutual influence of factors such as crack patterns, rock volume, rock percentages, and yield stress of the steel bars on the loading capacity of the columns. The criteria used to assess the differences between the results of experimental and numerical studies are the load capacity and crack pattern. However, in this methodology, the crack pattern does not accurately represent the underlying reasons for this discrepancy. The output indicates that the capacity load is in line with the computational load through the Abaqus program; however, the path of the crack differs slightly without affecting the failure mode. Increasing the rock percentage led to a decrease in the strength of the section. The yield stress of the steel bars and their curvature in specific places were influenced by the spatial changes in large rocks. To improve the efficiency of the RFC section, the use of excessively large or disproportionately sized rocks should be avoided. This suggests that the average rock diameter should not exceed 42% of the minimum length of the section occupied.
Rock-filled concrete columns under axial loads
Rock-filled concrete (RFC) was initially developed in China primarily for large-scale structures, particularly hydraulic structures. However, it raises questions about its suitability for use in more straightforward structural elements, such as columns. The challenges lie in determining the construction sequence methods and assessing its filling capacity when applying RFC to these structural components. This study investigated the behavior of 10 RFC columns under axial loading in terms of their mechanical properties through experimental and numerical analyses. The optimal design of a self-compact concrete (SCC) mix to fit the components of the structural elements was studied, and then the sequence of RFC column construction was proposed. A modified random rock model of RFC columns based on their position and rotation as an ellipsoid was developed. This model considers the mutual influence of factors such as crack patterns, rock volume, rock percentages, and yield stress of the steel bars on the loading capacity of the columns. The criteria used to assess the differences between the results of experimental and numerical studies are the load capacity and crack pattern. However, in this methodology, the crack pattern does not accurately represent the underlying reasons for this discrepancy. The output indicates that the capacity load is in line with the computational load through the Abaqus program; however, the path of the crack differs slightly without affecting the failure mode. Increasing the rock percentage led to a decrease in the strength of the section. The yield stress of the steel bars and their curvature in specific places were influenced by the spatial changes in large rocks. To improve the efficiency of the RFC section, the use of excessively large or disproportionately sized rocks should be avoided. This suggests that the average rock diameter should not exceed 42% of the minimum length of the section occupied.
Rock-filled concrete columns under axial loads
Mohamed S. Khalafalla (Autor:in) / Jin Feng (Autor:in)
2025
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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