單跨樁基礎橋梁模型之振動台實驗研究

陳能鴻

doi:10.6342/NTU.2013.00094

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單跨樁基礎橋梁模型之振動台實驗研究

Shaking table study on a single span pile foundation bridge model

陳能鴻 , Masters　　Advisor：張國鎮　　

繁體中文 DOI： 10.6342/NTU.2013.00094

多重災害；振動台；樁基礎；沖刷效應；土壤結構互制；土壤彈簧； Multi-hazard ； Shaking table test ； Pile foundation ； Scouring effect ； Soil-structure interaction ； Soil spring

Abstract │ Reference (18) │ Times Cited (5) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

This study investigated the seismic performance and soil-structure interaction of a scoured bridge with exposed pile foundation by dual biaxial laminar shear boxes and shaking table tests. The simply-supported bridge model was comprised of an I-section girder representing the superstructure, and two portal frames with cap-beam and circular tubes as substructure, individually supported by a massive block and single pipe as pile cap and pile foundation. Underneath the girder, two elastomeric rubber pads at left end stand for hinge condition, while a set of three rolling bearings at right end behaved ideal roller. The material for the bent, pile, and soil is steel, aluminum, and dry silica sand with relatively density of 50%, respectively. The pile tip was bolted at the bottom of the shear box. However, the pile is designated to be scoured as a ratio pile diameter (D) at either hinge-end (H) or roller-end (R) Category: H0D-R0D, H0D-R3D, H3D-R3D, H3D-R6D, H6D-R6D. The input ground motions included white noise of 30gal, acceleration records from El Centro, TCU076 station in Chi-Chi earthquake, and one spectrum-compatible time history converted from TCU076. The peak ground acceleration started from 100 gal and achieved 350 gal. Strain gauges and accelerometers were positioned along the height of pile surface. The pile and pier moment can calculate by strain gauges, and check the demand capacity ratio of structure. Both acceleration and displacement at girder, cap-beam , pile cap and frame of shear-box were also measured, the structure responses can be observed.
  Based on the experimental results, the general observation demonstrated that the structural period shifted longer as the scoured depth increased, as an evidence to explain why the response of maximum displacement of girder and column is getting larger while the maximum acceleration is getting smaller. Therefore, structural safety issue on the allowable criteria of column ductility and pile strength should be addressed and verified from rigorous analytical simulations.

Reference ( 18 ) 〈TOP〉

[3]Kohji Tokimatsua, Hiroko Suzuki, Masayoshi Sato(2005),.「Effects of Inertial and Kinematic Interaction on Seismic Behavior of Pile with Embedded Foundation」,Soil Dynamics and Earthquake Engineering,25,pp.753-762(accepted on 2004/11)
連結：
[6]賴姿妤，「樁基礎沖刷橋梁模型之振動台試驗研究」，台灣大學土木工程學研究所碩士論文，民國100年6月
連結：
[7]張國鎮、王修駿、劉光晏、陳家漢，「樁基礎沖刷橋梁模型之振動台試驗研究(II)」，國家地震工程研究中心研究報告(報告編號：NCREE-12-026)，民國101年12月。
連結：
[13]Designation:D4253-00，「Standard Test Methods for Maximum Index Density and Unit Weight of Soils Using a　Vibratory Table」,ASTM.
連結：
[14]Designation:D4254-00，「 Standard Test Methods for Minimum Index Density and Unit Weight of Soils and Calculation of Relative Density」,ASTM.
連結：

Times Cited (5) 〈TOP〉

Altmetrics

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