CAJ | 학술논문

为了研究群桩基础在水平荷载作用下地基土及桩身进入非线性状态后桩身内力变化过程和应力分布规律，通过对群桩基础缩尺比例模型进行拟静力试验，分析研究桩基础的破坏机制、承载能力及桩身应力分布；采用M 塑性铰模拟墩的弹塑性、PMM 塑性铰模拟变轴力作用下桩身的弹塑性和日本规范中推荐的方法模拟土的非线性建立有限元模型，对群桩承台墩整体结构进行 PUSHOVER 分析。结果表明：(1)水平荷载作用下，各桩受力不均匀，外排桩的桩身应力大于内排桩的桩身应力；(2)高承台桩桩身最大应力点位于土面以下2~4倍桩径范围内。
위료연구군장기출재수평하재작용하지기토급장신진입비선성상태후장신내력변화과정화응력분포규률，통과대군장기출축척비례모형진행의정력시험，분석연구장기출적파배궤제、승재능력급장신응력분포；채용M 소성교모의돈적탄소성、PMM 소성교모의변축력작용하장신적탄소성화일본규범중추천적방법모의토적비선성건립유한원모형，대군장승태돈정체결구진행 PUSHOVER 분석。결과표명：(1)수평하재작용하，각장수력불균균，외배장적장신응력대우내배장적장신응력；(2)고승태장장신최대응력점위우토면이하2~4배장경범위내。
In order to study the change process of internal forces and distribution rule of stress of pile considering nonlinear behaviors of pile shaft and subsoil under lateral loads, the pseudo-static test on scale model are carried out to study failure mechanism, bearing capacity and stress distribution of pile. A nonlinear static calculation model of pile group foundations is put forward to conduct Pushover analysis on pile-pile cap-pier structure, in which the elastoplasticity of pier shafts is simulated by M plastic hinge, pile shafts in variable axial loads issimulated by distributed PMM plastic hinge and nonlinearity of subsoil is simulated by the method given in Japan Railway Code. The results show that:(1) Under lateral loads, piles are not loaded uniformly,and the stress of outer row of pile is greater than the inside row of pile. (2)The maximum stress point of tall platform pileis located at the depth of about 2 ~ 4 radius.