振動台多層剪力砂箱實驗模擬橋梁基樁位於乾砂與飽和砂動力行為之分析與探討

Study on Dynamic Behavior of Bridge Pile in Dry and Saturated Sand Through Shaking Multi-Layer Shear Box Test

宋裕祺(Yu-Chi Sung) ； 張國鎮(Kuo-Chun Chang) ； 陳正興(Cheng-Hsing Chen) ； 翁作新(Tzou-Shin Ueng) ； 劉光晏(Kuang-Yen Liu) ； 陳家漢(Chia-Han Chen) ； 董學宜(Shiue-Yi Dung) ； 王修駿(Shiou-Chun Wang) ； 邱毅宗(Yi-Tsung Chiu)

《中國土木水利工程學刊》 26卷2期 (2014/06) Pp. 127-139

https://doi.org/10.6652/JoCICHE.201406_26(2).0004

摘要

本文探討樁基礎橋梁位於乾砂與飽和砂且基樁無裸露之受震反應。根據國家地震工程研究中心所進行之縮尺橋梁單樁試體砂箱振動台實驗，採用OpenSees（Open System for Earthquake Engineering Simulation）進行動力分析，探討以相對密度、單層及雙層土層剪力波速方式決定之土壤參數，對於結構與土壤反應預測之準確性。經比較實驗結果顯示，本文研提分析模式可有效預測上部結構之最大相對位移、絕對加速度歷時反應、樁頂彎矩，以及飽和砂之超額孔隙水壓變化。相關研究成果可提供橋梁樁基礎之耐震設計與檢核參考。

關鍵字

雙軸向多層剪力砂箱 ； 振動台實驗 ； 土壤結構互制 ； 超額孔隙水壓

並列摘要

This etcpaper intends to study the interaction of dynamic response between bridge pile and soil surrounding through shaking table test of sandbox. The experimental dynamic responses of the bridge pier with pile located at dry and saturated sand, respectively, were obtained through the experiment model including mass block, bridge column and pile embed in sandbox conducted by National Center of Research on Earthquake Engineering (NCREE). The experimental results were served as the database for investigation. In additional to a deeper discussions on the differences between experimental results of dry sand and saturated sand, this paper used software of OpenSees to establish a three dimensional finite element model for nonlinear time history analysis. Through comparing the analytical results and experimental results, the accuracy of the model established was able to be assured so that the soil structure interaction between pile and soil (dry sand / saturated sand) can be better understood and served as prediction for the similar cases in practical engineering application.

並列關鍵字

sandbox ； shaking table test ； soil-structure interaction ； excess pore pressure