A STUDY ON THE SEISMIC FORCE RESISTING MECHANISM OFA MULTI-STORY SHEAR WALL SYSTEMCONSIDERING THE INTERACTION BETWEENWALL, SLAB, FOUNDATION BEAM, AND PILE ELEMENTS

摘要

Two 1/5 scale specimens were designed and constructed as basic structural assemblage models extractedfrom a practical six-story shear wall system. Those specimens consisted of a bottom two-story part of theshear wall system, a foundation beam, slabs, and two piles. Static lateral load was applied withproportionally varying vertical load to simulate loading conditions of the prototype six-story shear wallsystem under earthquakes.The foundation beam resisted by itself and the contribution from the piles and shear wall was less thanexpected. This caused unexpected shear cracking to spread extensively over the foundation beam.However, longitudinal bars in slabs worked together with the upper longitudinal reinforcement in thefoundation beam. Transition of shear transfer mechanisms at the shear wall base was observed from thestrain distribution of longitudinal reinforcement in foundation beams and those strain distributions ofdifferent loading stage were predicted accurately. The lateral load–drift relations obtained experimentallywas simulated well with a simple superposition of flexure and shear elements.