Title:
Response and Modelling of Slender Wall Subjected to Lateral and Axial Loading
Author(s):
Austin Martins-Robalino, Alessandro Paglia, and Dan Palermo
Publication:
Symposium Paper
Volume:
365
Issue:
Appears on pages(s):
93-112
Keywords:
reinforced concrete, slender shear wall, reverse cyclic loading, axial loading, nonlinear finite element analysis (NLFEA)
DOI:
10.14359/51746686
Date:
3/1/2025
Abstract:
Experimental testing of a reinforced concrete shear wall subjected to combined axial load and reverse cyclic lateral displacements was conducted to investigate rocking and sliding observed in a companion wall tested without axial loading, and to assess the effect of axial load on residual drifts. The application of 10% axial load resulted in greater lateral load capacity and stiffness, as well as increased ductility. The presence of axial load contributed to satisfying lower residual drift limits at higher transient drifts. Further analysis was conducted to disaggregate the total lateral displacement into sliding, rocking, shear, and flexure mechanisms. Comparison to the companion wall demonstrated that the present wall had significantly greater contribution from flexural effects with the axial load delaying the influence of rocking until crushing of the concrete. A complementary numerical study of the wall with axial load was conducted, and a modelling methodology was presented to better capture the fracture phenomena of steel reinforcement. This methodology accounted for local fracture of reinforcement and a reduction of reinforcement area due to the presence of strain gauges. The simulation of failure and the predicted lateral displacement capacity were significantly improved compared to a model that did not consider these phenomena.