Abstract
Recent developments in computer technology have made possible the use of finite element methods for 3D modeling and analysis of reinforced concrete structures. In this study, the failure behavior and crack formation of an R/C frame under monotonic and reversed-cyclic lateral loading are studied by 3D nonlinear finite element analysis using ANSYS software. Modeling the nonlinear behavior of concrete material as well as the reinforcing steel embedded within concrete is a difficult task. Different methodologies and modeling options are considered in the computer model. The application of reversed cyclic displacement loading and the execution of nonlinear analyses are explained in detail. Load-displacement relationships and concrete crack profiles are obtained in order to compare with the experimental data and observed crack profile. The analysis results compared well with the experimental data based on the comparison of load-displacement graphs. The failure mode of the frame is identified by the crack profiles displayed on the structure.
Highlights
In order to properly design Reinforced Concrete (R/C) structures to withstand lateral loads resulting from earthquakes as well as high winds, the failure behavior is usually investigated through laboratory tests
Due to the difficulties faced during the fabrication and testing of real size models of R/C buildings and frames within a laboratory, Finite Element (FE) analysis of the computer models of R/C structures is quite popular among researchers
This work is focused on FE modeling and analysis of R/C frames with ANSYS [1] since it is a sophisticated software with a 3D eight-node isoparametric FE element which can be used to model concrete material and its cracking behavior
Summary
In order to properly design Reinforced Concrete (R/C) structures to withstand lateral loads resulting from earthquakes as well as high winds, the failure behavior is usually investigated through laboratory tests. Due to the difficulties faced during the fabrication and testing of real size models of R/C buildings and frames within a laboratory, Finite Element (FE) analysis of the computer models of R/C structures is quite popular among researchers. This work is focused on FE modeling and analysis of R/C frames with ANSYS [1] since it is a sophisticated software with a 3D eight-node isoparametric FE element which can be used to model concrete material and its cracking behavior. The FE model of an R/C frame fabricated and experimentally tested by Akin [13] at Selcuk University, Civil Engineering Structures Laboratory is constructed and analyzed under monotonic and reversed-cyclic lateral loading. The crack profiles obtained at various stages of the reversed-cyclic loading are significant in the identification of the failure modes of the R/C frames
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