Title: Seismic Design of Columns and Walls on Weak First Floor in Piloti-Type Bearing Wall Buildings
Author(s): Seung-Jae Lee and Tae-Sung Eom
Publication: Structural Journal
Appears on pages(s): 183-193
Keywords: nonlinear static analysis; piloti; seismic design; soft story; torsional irregularity; wall; weak story
This study investigated the seismic vulnerability of piloti-type bearing wall buildings supported by columns and walls on a weak first floor. Linear and nonlinear static analyses were performed to investigate the contributions of the columns and walls to lateral strength and stiffness, depending on torsional irregularity. The results show that the columns and walls were dominated by flexure and in-plane shear, respectively. Before yielding, the walls resisting in-plane shear mainly contributed to the stiffness and strength of the buildings; as shear cracking and yielding of the walls occurred, the contribution of the columns to the strength increased. Thus, during the inelastic behavior, the columns significantly contributed to the peak strength and ductility. Based on the results, design and detailing requirements for the columns and walls on a weak first floor were proposed. The validity of the proposed method was verified
through nonlinear static and dynamic analyses.