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Effects of geometric nonlinearity and cracking on concrete planar frames
Reinforced concrete structures are commonly designed, for non-slender members, using elastic analysis methods assuming a fully effective cross-section. In this study the effects of geometric nonlinearity, with and without cracking of the concrete cross-section under tension, are investigated. The theory underlying geometric nonlinear analysis, stability functions, and reduction of the effective stiffness of concrete members due to cracking is presented. A method of analysis, incorporating these effects for planar concrete structures, is proposed and a computer program developed. The computer program is used to perform two parametric studies. The first parametric study is for a freestanding cantilevered column, of constant cross-section and reinforcing ratio, acted on by axial and transverse loads. The free parameter is the number of column elements. The second parametric study is for a freestanding cantilevered column of constant cross-section acted on by axial and transverse loads. The free parameter is the reinforcement ratio of the column. The computer program produces results for linear analysis, linear analysis with concrete cracking, nonlinear analysis, and nonlinear analysis with concrete cracking. The parametric study results are compared with accepted design methods based on linear analysis and uncracked members.
Effects of geometric nonlinearity and cracking on concrete planar frames
Reinforced concrete structures are commonly designed, for non-slender members, using elastic analysis methods assuming a fully effective cross-section. In this study the effects of geometric nonlinearity, with and without cracking of the concrete cross-section under tension, are investigated. The theory underlying geometric nonlinear analysis, stability functions, and reduction of the effective stiffness of concrete members due to cracking is presented. A method of analysis, incorporating these effects for planar concrete structures, is proposed and a computer program developed. The computer program is used to perform two parametric studies. The first parametric study is for a freestanding cantilevered column, of constant cross-section and reinforcing ratio, acted on by axial and transverse loads. The free parameter is the number of column elements. The second parametric study is for a freestanding cantilevered column of constant cross-section acted on by axial and transverse loads. The free parameter is the reinforcement ratio of the column. The computer program produces results for linear analysis, linear analysis with concrete cracking, nonlinear analysis, and nonlinear analysis with concrete cracking. The parametric study results are compared with accepted design methods based on linear analysis and uncracked members.
Effects of geometric nonlinearity and cracking on concrete planar frames
Brantley, R. (author) / Fafitis, A. (author)
1998
10 Seiten, 7 Quellen
Conference paper
English
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