CAJ | 학술논문

目前地震作用下桩基水平动力响应一直是岩土工程界和地震工程领域关注的热点研究问题之一。本文基于振动台试验，通过不同的台面输入波形，引入 FBG 传感系统对土-群桩-承台结构水平动力响应特性及 P-Y 曲线主干线变化规律进行研究，并将群桩中各基桩和单桩 P-Y 曲线主干线与 API 规范推荐方法进行对比研究。结果表明：对于非液化土试验，各承台的加速度和位移较台面放大倍数普遍不大；饱和砂土试验单桩承台加速度和位移比群桩大2~3倍，群桩承台加速度和位移幅值分别是非液化土的2~3倍；非液化土试验桩基 P-Y 曲线主干线倾斜度与 API 规范方法符合较好，而饱和砂土中无论是单桩还是群桩 P-Y 主干线均需将 API 规范方法进行适当的折减。
목전지진작용하장기수평동력향응일직시암토공정계화지진공정영역관주적열점연구문제지일。본문기우진동태시험，통과불동적태면수입파형，인입 FBG 전감계통대토-군장-승태결구수평동력향응특성급 P-Y 곡선주간선변화규률진행연구，병장군장중각기장화단장 P-Y 곡선주간선여 API 규범추천방법진행대비연구。결과표명：대우비액화토시험，각승태적가속도화위이교태면방대배수보편불대；포화사토시험단장승태가속도화위이비군장대2~3배，군장승태가속도화위이폭치분별시비액화토적2~3배；비액화토시험장기 P-Y 곡선주간선경사도여 API 규범방법부합교호，이포화사토중무론시단장환시군장 P-Y 주간선균수장 API 규범방법진행괄당적절감。
The horizontal dynamic response of pile foundations in liquefiable soil has always been an important research question in the geotechnical field and the field of earthquake engineering. Based on the shaking table test with different input waveforms,the horizontal dynamic interaction responses of the soil-pile-slab system and the variation of the P-Y curve were analyzed using the FBG system.The P-Y curves of each pile in the pile group and single piles were compared with the API specification method.The research results showed that magnification of cap acceleration and displacement was small in general for non-liquefied tests.The cap acceleration and displace-ment of single piles were 2 to 3 times greater than for piles in the pile group,while the cap accel-eration and displacement of piles in the pile group were 2 to 3 times greater than for non-liquefied cases.The slope of the P-Y curve for non-liquefied tests agreed well with the API specification method;however,the P-Y curves for both single piles and piles in the group were needed to re-duce the API method appropriately in saturated soil.