CREEP EFFECT ON BEHAVIOR OF ECCENTRICALLY LOADED REINFORCED CONCRETE COLUMNS MADE OF HIGH-STRENGTH CONCRETE
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Abstract
The focus of the research is on eccentrically loaded reinforced concrete elements made of high-strength concrete with mineral additives such as fly ash and silica fume. The behavior of eccentrically loaded reinforced concrete elements was studied on a reinforced concrete column. At the age of 90 days the reinforced concrete column was subjected to a compressive force of 66 kN with an eccentricity of 12.5 cm. The loading duration was 245 days. During the tests, the average strains caused by eccentric loading, shrinkage, and creep concrete on the column were measured. In addition, the deflections and crack opening widths were measured. Experimental data were compared to theoretical data obtained using a stepwise version of the elastic solutions method (the stepwise method). In this method, the continuous change of stresses and strains of reinforced concrete elements under loading is replaced with a stepwise change. The considered loading time is divided into specific intervals (steps). Due to the creep of concrete, the conditions for compatibility of deformations are violated at the end of each step. The restoration of the conditions is carried out due to elastic deformations while simultaneously satisfying the conditions of static equivalence. The results of the comparison demonstrate that the stepwise meth-od adequately describes the changes of strains and deflections of eccentrically loaded reinforced concrete columns made from high-strength concrete over time. For the first time, the stepwise method was used to calculate the crack opening width. The calculation results are in good agreement with the experiments and show a significantly smaller increase in crack opening over time compared to that calculated according to Russian Building Codes.
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