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Centrifuge shaking table tests on composite caisson-piles foundation
| Content Provider | Scilit |
|---|---|
| Author | Liang, F. Jia, Y. Zhang, H. Chen, H. Huang, M. |
| Copyright Year | 2018 |
| Description | Book Name: Physical Modelling in Geotechnics |
| Abstract | To study the dynamic soil-foundation-structure interaction, centrifuge shaking table tests on a composite caisson-piles foundation (CCPF) were carried out. A series of 1:50 scaled models were designed to simulate a 2 × 2 pile group connected with caisson. The infinite boundary was simulated by a laminar shear box with rubber film inside to eliminate the reflected wave. The results show that the peak bending moment of pile shaft increases gradually from pile tip to pile head for CCPF in both homogeneous and layered soils. Due to the nonlinearity of the system under strong seismic excitations, the maximum bending moments increase with the input PGA growing yet at reduced rate. Sympathetic vibration may generate in CCPF embedded in layered subgrade consisting of hard soil underlain by soft soil, which will lead to larger acceleration of superstructure and larger bending moment of piles compared with CCPF embedded in homogenous soft soil subgrade. This chapter performs dynamic centrifuge tests on composite caisson-piles foundation embedded in homogeneous clayey silt or layered soil consisting of medium sand underlain by clayey silt. The gravity level was set as 50 g. The Chi-Chi earthquake wave, which is of abundant frequency components, was employed as input motion. The CCPF model is composed of a caisson and a 2× 2 pile group rigidly connected to the caisson. The superstructure was simplified as lumped mass and connecting columns. The accelerations of soil and superstructure, the pile bending moments are analyzed. The test results are of reference value to the design of composite caisson-piles foundation. The chapter presents the dimensions and test results in prototype units unless otherwise noted. The centrifuge tests were carried out with centrifuge facility TLJ-150 at Tongji University. The CCPF and the superstructure model were made of aluminum alloy, of which the elastic modulus, Poisson's ratio and density were 70 GPa, 0.33 and 2.7g/cm3, respectively. |
| Related Links | https://content.taylorfrancis.com/books/download?dac=C2018-0-86960-X&isbn=9780429438646&doi=10.1201/9780429438646-22&format=pdf |
| Ending Page | 914 |
| Page Count | 6 |
| Starting Page | 909 |
| DOI | 10.1201/9780429438646-22 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2018-07-11 |
| Access Restriction | Open |
| Subject Keyword | Book Name: Physical Modelling in Geotechnics Geological Engineering Acceleration Pile Group Caisson Centrifuge Tests |
| Content Type | Text |
| Resource Type | Chapter |
