ブックタイトル竹中技術研究報告書No70

概要

竹中技術研究報告書No70

TAKENAKA TECHNICAL RESEARCH REPORT No.70 2014竹中技術研究報告No.70 2014Fig. 9 Relationship between horizontal acceleration and shear force at pile headFig. 10 Relationship between shear force of pile head and lateral resistance of raft5.2 Estimation of Lateral Load BalanceLateral load balances are shown in Fig. 11 when the inertial force of the building is maximum or minimum. The times A andB in Fig. 11 correspond to those shown in Fig. 8. These figures also show the measured bending moment of the piles and animage of deflection of the piles. The shear force at the pile head and the frictional resistance beneath the raft was workingagainst the inertial force of the building. The embedded side walls were also working against the inertial force.6 CONCLUSUIONSSeismic observations on the piled raft foundation subjected to unsymmetrical earth pressure were performed since after the2011 off the Pacific Coast of Tohoku Earthquake. Accelerations of the building, dynamic sectional forces of piles and dynamicearth pressures on both sides of the embedded foundation and beneath the raft were observed at maximum acceleration of 0.322m/s 2 . Based on the seismic records, it was confirmed that a lateral inertial force of the building was supported by frictionalresistance beneath the raft as well as shear forces of piles. The embedded side walls were also working against the inertial force.48