Rocking Shear Wall Foundations in Regions of Moderate Seismicity

摘要

This paper presents an investigation to reduce the size of shear wall foundations for earthquakernforces in region of moderate seismicity. The approach taken is to allow rocking of the shear wallrnfoundation and to include the frame action of the structure to assist as lateral force resisting system.rnAn initial feasibility study is presented where the shear wall foundation and the structural frame arerntheoretically modelled as a single degree of freedom system, subjected to base accelerations fromrnrecorded ground motions. An example building is studied with the shear wall foundation designedrnfor 40%, 60%, 80% and 100% of the design overturning moment from the seismic event. Timernhistory analyses are performed with input from five earthquakes. It is shown that the concept isrnfeasible and the next phase will consist of improved modelling to allow for distribution of massrnover the height of the structure as well as shear wall stiffness.