An Aseismic Design Method For Preventing
Damage Of A Soil-pile Foundation-super
Structure System
Author(s)
K. Fuchida & T. Akiyoshi
Abstract
An effective aseismic design method for the conditions of ground improvement
is proposed for preventing liquefaction of ground and reducing damage of pile
foundations. The proposed method uses two existing computer programs; NUW2
for 2D effective stress analysis and WAP3 for simulation of the sand compaction
pile method. The analysis is extended to take the soil-pile interaction into
consideration. Numerical computations for responses of the ground and the pile
foundations are performed for the 22 ground models in the Kobe area. By using
the natural period of the ground as the key parameter, the critical conditions of
ground improvement are evaluated and related with the responses of pile and
superstructure on the ground. The main conclusion is that the proposed method is
effective for reducing pile stress under an allowable limit by ground
improvement in sandy layers, but the ground improvement is difficult to prevent
pile failure in soft clayey ones.
Keywords: effective stress analysis, liquefaction, pile, ground improvement,
interaction, aseismic design.
1 Introduction
Many damages of foundation structures and tilt of structures occurred at
reclaimed land during 1995 Hyogo-ken-nanbu Earthquake (AIJ [1]). The
characteristics of surface ground layers by strong ground motion and liquefaction
causes the damages of pile foundation. There are many countermeasures against
Keywords
effective stress analysis, liquefaction, pile, ground improvement,
interaction, aseismic design.
Related Book
Other papers in this volume
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