OasisLMS

Abstract: Development of drilled shaft construction methods with specific application as foundation support for high rise buildings is being actively pursued in Japan. Some of these developments include the use of large diameter (about 1 to 3 meters) drilled shaft with the bottom diameter enlarged to about 4 to 6 meters (13 to 20 feet) to provide large end bearing resistance and the use of steel pipe in the upper part of the shaft for earthquake-resistant design to resist high bending moment and shear forces from the inertia forces of the building during an earthquake. In addition, in order to resist the large uplift (pull-out) force in high rise buildings, drilled shafts with multi-stage enlarged nodules along the shaft have been developed and used in high rise buildings.

In this paper, we present various drilled shaft methods and types and introduce an example of a building that uses a drilled shaft with enlarged bottom in combination with multi-stage enlarged nodules.

Dr. YUSUKE HOMMA; Engr. Dr. Yujiro Tanaka

Annual Conference Proceedings