NONLINEAR BEHAVIOR OF RC I-SHAPED AND RECTANGULAR SHEAR WALLS

A numerical study using finite element analysis is performed to investigate the behavior of reinforced concrete shear walls with I-shaped and rectangular cross sections and subjected to combined axial force and monotonic lateral load. The specimens selected for calibration and verification include one framed wall where the boundary elements protrude from the surface of the wall (SW3) and one wall with rectangular cross section (SW5), which were tested under monotonic loading in the University of California. The analytical models are implemented in ABAQUS 6.6 to allow comparison between experimental and analytical results for the test specimens. The analysis results show excellent agreement with experimental measurements of the specimens. An important feature of the study focuses on capability of the model in predicting the mode of failure of the specimens, especially the out-of-plane deformations of the compression column observed in the experimental behavior of the rectangular wall (SW5). Actually, the failure of Specimen SW5 is accompanied by out of plane deformations which is a common phenomenon observed in plain rectangular walls, not having relatively stiff confined boundary elements. This mode of behavior is evaluated in comparison with the one of the Ishaped model (SW3) using distribution of the von Mises stress. A parametric study is also conducted to investigate sensitivity of the model to mesh refinement. Although using finer elements to mesh the model results in more accuracy of the response, the CPU time increases considerably as a result.

کلیدواژه ها:

Shear wall ، Finite element ، Nonlinear behaviour ، Test Specimens