Study on Torsional Behavior of Composite Foundation |
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- Simple Estimation Method of Bending Moment at Pile Head - |
Hiroto NISHIO, Toshiaki NAGAO and Masato MAJIMA |
This paper propose a simple estimation method of the pile head bending moment of composite foundation where a spread foundation and pile are combined. In the method, the influences of load switchover due to difference in foundation rigidity and torsional behavior on pile head bending moments are considered. To confirm the validity of the method, within the regions of elastic behavior, comparisons with the three dimensional FEM analyses were carried out for 18 cases where number of pile and weight balance of the building were varied in the two kinds of ground conditions with and without dip bearing stratum. The results shows that the proposed simple method gives accurate pile head bending moment, within the error of 20%. |
keywords: |
pile foundation, spread foundation, dip bearing stratum, simple method, FEM analysis, torsion |