A NONLINEAR STATIC ANALYSIS STUDY OF AN RC STRUCTURE WITH WALLS
Date Issued
2016
Date
2016
Author(s)
Chen, Hsin-Hung
Abstract
Knowing the lateral load-lateral displacement of an RC (reinforced concrete) wall is an important but difficult work for nonlinear static analysis and seismic capacity evaluation. However, up to now the simulation about nonlinear behavior of an RC wall has not obtained yet an accurate and unified way. In this research, the moment–bending displacement response of an RC wall under an axial load and moment is obtained from moment–curvature analysis using the wall’s proper plastic hinge length. Furthermore, the shear-shear displacement response of the RC wall under axial load and shear with considering the effect of the height-depth ratio of the RC wall (Hin/Lw) was established by means of two regressed factor Cs(regressed by 21 tests'' data) and Cd(regressed by 23 tests'' data) to modify the shear force and the shear displacement respectively calculated by the modified compression-field theory (MCFT). By integrating the moment–bending displacement and the shear–shear displacement responses, the lateral load–lateral displacement response of the RC wall under axial load–moment–shear interaction can be reasonably determined. To confirm the reliability of the proposed method, the analysis results of a further 44 tests along with a blind test, and are then compared with the experimental results. From the statistical results of the 67 tests, it was shown that the proposed method provides a good prediction of the lateral ultimate load but somewhat underestimates the lateral ultimate displacement. Thus, using Cs and Cd to adjust the shear and shear displacement obtained from the modified compression-field theory, respectively, to reflect the influence of Hin/Lw is acceptable. In addition, to provide an application illustration for engineers, this article establishes a 6 floor RC structure (pure RC frame), a 6 floor RC structure with walls and a 6 floor RC structure with walls containing windows to explain how to use an equivalent column model and set plastic hinges to simulate an RC wall in SAP2000 or ETABS nonlinear static analysis. Through the nonlinear static analysis result of the above three RC structures, the influence and contribution of RC walls on the RC structures are discussed in this article.
Subjects
reinforced concrete wall
lateral load-lateral displacement
nonlinear static analysis
seismic capacity evaluation
height-depth ratio
equivalent column
Type
thesis
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