Concrete Column Interaction Diagram Software __TOP__
the first-order and second-order analysis methods, including simplified method using only the maximum moment method, simplified method using second-order analysis, and long column reduction factor method are compared with each other. in each case, the results of the first-order analysis are represented by diamond symbols.
Concrete Column Interaction Diagram Software
in current study, the design basis for steel reinforcement was 0.45 mm in diameter for beams and columns and 0.2 mm for shear webs. the specified reinforcement ratio is 24% (equal to 4.8 mm in diameter for beam and 1.6 mm for column and shear webs) which is consistent with commonly used in the construction industry. in this study, the number of reinforcement bars is three and four for beams and columns, respectively. the design of the column shows a general flexural-torsional zone with rectangular cross section. the main objective of the study was to analyze the capacity of the beam and column using a second-order analysis model. an equivalent rc column was constructed for studying the effect of eccentricity, slenderness ratio, and steel ratio on the nonlinear behavior of the beam and column.
multistranded steel reinforcement is usually used in reinforced concrete columns. for example, in the present study, steel reinforcement was designed in an elliptical shape and the reinforcement ratio was 24%. in this study, the use of elliptical reinforcement is as a result of the analysis of the eccentricity and slenderness ratio effect on the capacity of the beam and column. the following assumptions were made for the continuous model: (1) a sectional plane was considered, and the midpoint of the section was assumed to be the neutral axis. (2) the concrete material was assumed to be isotropic and homogeneous, without damage. (3) the shear cracks were considered in order to support local loads. (4) the concrete material was modeled as a transversely isotropic material, where the local behavior of the material is related to the axis of interest by means of a couple stress. concrete and steel were modeled as isotropic materials with linear elastic and elastic-plastic behavior, respectively. (5) the bars were considered to have a rectangular shape with constant cross section. (6) the design of the reinforcement bars was taken into consideration, i.e. 0.45 mm for the beams and 0.2 mm for the columns and shear webs. the effect of slenderness ratio was studied for two different eccentricities: 0% and 5%. the eccentricity of the column was controlled by reducing the length of the column by 5% or 10%. the results of this study showed that the capacity of the beam and column increased as the eccentricity increased. this is in agreement with the results of earlier studies. in this study, the effect of the eccentricity was studied in terms of the capacity of the column and beam.
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