|
|
|
| SIMPLIFIED ANALYTICAL METHOD FOR SEISMIC RESPONSE OF COMPOSITE CAISSON-PILES FOUNDATIONS |
| ZHONG Rui1，2，HUANG Maosong1，2 |
| (1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China) |
|
|
|
|
Abstract Seismic response of a new type of foundation，the composite caisson-piles foundation，is studied through a simplified analytical method. The focus is the contribution of the piles beneath the caisson in increasing the earthquake resistance of the foundation-superstructure system. Firstly，considering the interaction between the soil and foundation with dynamic Winkler model，the equation of kinematic response of the composite foundation under S-wave is derived. Secondly，a simplified model for the seismic response of the foundation-column-lumped mass system in frequency domain is built；and with Fourier transformation this method is applied to transient seismic problems. Thirdly，with an example of soil-foundation-superstructure seismic behavior，this proposed method is validated by comparison against 3D dynamic FEM modeling，in which domain reduction method(DRM) is utilized. Lastly，the significance and mechanism of adding piles in improving the earthquake resistance of the foundation and superstructure are analyzed through examples in different soil conditions. Discovery in this study is that adding piles under the caisson is an efficient way to increase the seismic resistant capability of the soil-foundation-superstructure system；and the main mechanism is the elimination of the pseudo-resonance.
|
|
Received: 04 October 2012
|
|
|
|
| [1] 过 超，龚维明，徐国平，等. 沉箱–钢管桩逆作法复合基础试验[J]. 解放军理工大学学报：自然科学版，2009，10(5)：472–477.(GUO Chao，GONG Weiming，XU Guoping，et al. Experimental research on complex foundation of caisson-steel pile in top-down order[J]. Journal of PLA University of Science and Technology：Natural Science，2009，10(5)：472–477.(in Chinese))
[2] 钟 锐，黄茂松. 沉箱加桩复合基础的振动特性[J]. 世界地震工程，2010，26(增1)：167–171.(ZHONG Rui，HUANG Maosong. Vibration of composite foundation made up of caisson and pile group[J]. World Earthquake Engineering，2010，26(Supp.l)：167–171.(in Chinese))
[3] 黄茂松，钟 锐，任 青. 层状地基中沉箱加桩复合基础的水平-摇摆振动[J]. 岩土工程学报，2012，34(5)：790–797.(HUANG Maosong，ZHONG Rui，REN Qing. Lateral vibration of caisson-pile composite foundation in layered soils[J]. Chinese Journal of Geotechnical Engineering，2012，34(5)：790–797.(in Chinese))
[4] MYLONAKIS G，GAZETAS G. Kinematic pile response to vertical P-wave seismic excitation[J]. Journal of Geotechnical and Geoenviromental Engineering，2002，128(10)：860–867.
[5] MAKRIS N，GAZETAS G. Dynamic pile-soil-pile interaction. Part II：lateral and seismic response[J]. Earthquake Engineering and Structural Dynamics，1992，21(2)：145–162.
[6] GEROLYMOS N，GAZETAS G. Winkler model for lateral response of rigid caisson foundations in linear soil[J]. Soil Dynamics and Earthquake Engineering，2006，26(5)：347–361.
[7] VARUN，ASSIMAKI D，GAZETAS G. A simplified model for lateral response of large diameter caisson foundations—linear elastic formulation[J]. Soil Dynamics and Earthquake Engineering，2009，29(2)：268–291.
[8] VARUN. A simplified model for lateral response of caisson foundations[M. S. Thesis[D]. Athens，Greece：Georgia Institute of Technology，2006.
[9] MYLONAKIS G，NIKOLAOU S，GAZETAS G. Footings under seismic loading：analysis and design issues with emphasis on bridge foundations[J]. Soil Dynamics and Earthquake Engineering，2006，26(9)：824–853.
[10] TSIGGINOS C，GEROLYMOS N，ASSIMAKI D et al. Seismic response of bridge pier on rigid caisson foundation in soil stratum[J]. Earthquake Engineering and Engineering Vibration，2008，7(1)：33–44.
[11] MYLONAKIS G，NIKOLAOU A，GAZETAS G. Soil-pile-bridge seismic interaction：kinematic and inertial effects. Part 1：soft soil[J]. Earthquake Engineering and Structural Dynamics，1997，26(3)：337–359.
[12] BIELAK J，LOUKAKIS K，HISADA Y，et al. Domain reduction method for three-dimensional earthquake modeling in localized regions. Part I：theory[J]. Bulletin of the Seismological Society of America，2003，93(2)：817–824.
[13] YOSHIMURA C，BIELAK J，HISADA Y. Domain reduction method for three-dimensional earthquake modeling in localized regions. Part II：Verification and examples[J]. Bulletin of the Seismological Society of America，2003，93(2)：825–840.
[14] JEREMI? B，JIE G Z，PREISIG M et al. Time domain simulation of soil-foundation-structure interaction in non-uniform soils[J]. Earthquake Engineering and Structural Dynamics，2009，38(5)：699–718. |
|
|
|
2013, Vol. 32 
