Development of interaction surfaces for RCC columns subjected to axial load and biaxial bending reinforced with Fe550 steel
By: Patrekar, Shweta R
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Contributor(s): Kumbhar, Popat D.
Publisher: Mumbai ACC LTD 2023Edition: Vol.97(5), May.Description: 23-31p.Subject(s): Civil EngineeringOnline resources: Click here
In:
Indian Concrete Journal - ICJSummary: RCC elements subjected to axial load and biaxial bending generally come across in design practice; a corner column in an RCC-framed structure is a typical example. Failure of any column subjected to bending, for a particular axial load, can be shown by a failure surface called an interaction surface. This interaction surface is required for designing columns subjected to axial load and bending. An interaction diagram is a vertical section of the interaction surface showing a plot of the axial load a column could carry against its moment capacity. In recent years, higher grades of concrete and steel (Fe550, Fe550D) are being used in many construction projects. With the introduction of such new grades of materials, it has become necessary to develop interaction surfaces and diagrams to meet the design requirements. This paper presents the interaction surfaces developed using ETABS and MATLAB software for RCC columns of different sizes subjected to axial load and biaxial bending considering M20, M25, and M30 concrete grades and Fe415, Fe500, and Fe550 steel grades. Results indicate that for the same column size and concrete grade, the moment-carrying capacity of the column increases by 18.22 % and 29.81 % for Fe500 and Fe550 steels respectively when compared to the column with Fe415 steel. Also, for the same column size and steel grade, the moment-carrying capacity of the column increases by 7.91 % and 13.26 % for M25 and M30 concrete grades respectively when compared to the column with M20 concrete grade. As the developed interaction diagrams are not available in the SP16 code for Fe550 steel, it would be beneficial for designers to verify if the designed column is safe or unsafe.
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School of Engineering & Technology (PG) Archieval Section | Not for loan | 2023-0961 |
RCC elements subjected to axial load and biaxial bending generally come across in design practice; a corner column in an RCC-framed structure is a typical example. Failure of any column subjected to bending, for a particular axial load, can be shown by a failure surface called an interaction surface. This interaction surface is required for designing columns subjected to axial load and bending. An interaction diagram is a vertical section of the interaction surface showing a plot of the axial load a column could carry against its moment capacity. In recent years, higher grades of concrete and steel (Fe550, Fe550D) are being used in many construction projects. With the introduction of such new grades of materials, it has become necessary to develop interaction surfaces and diagrams to meet the design requirements. This paper presents the interaction surfaces developed using ETABS and MATLAB software for RCC columns of different sizes subjected to axial load and biaxial bending considering M20, M25, and M30 concrete grades and Fe415, Fe500, and Fe550 steel grades. Results indicate that for the same column size and concrete grade, the moment-carrying capacity of the column increases by 18.22 % and 29.81 % for Fe500 and Fe550 steels respectively when compared to the column with Fe415 steel. Also, for the same column size and steel grade, the moment-carrying capacity of the column increases by 7.91 % and 13.26 % for M25 and M30 concrete grades respectively when compared to the column with M20 concrete grade. As the developed interaction diagrams are not available in the SP16 code for Fe550 steel, it would be beneficial for designers to verify if the designed column is safe or unsafe.
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