CAJ | 학술논문

基于黏弹性人工边界，建立上部结构-桩-土的共同作用三维有限元模型，分析地震作用下预应力混凝土管桩的运动响应特性。分别针对预应力混凝土管桩的桩径、双层软硬土剪切波速比值、上覆土层厚度、上部结构荷载等影响因素进行数值计算。参数分析表明：在地震作用下，桩径的增大会导致桩身整体弯矩相应增加，特别是桩身土层分界面处增大明显；软硬土层剪切波速比及上覆土层厚度的增加，引起土层分界面处桩身峰值弯矩增加；固定桩头条件下，桩头与桩身软硬土层分界面处均会产生较大的运动弯矩；上部结构的惯性荷载对固定桩头的内力有着较大影响，对桩身深处段弯矩影响较小。本文研究结论可为预应力混凝土管桩抗震设计提供有益的理论参考。
기우점탄성인공변계，건립상부결구-장-토적공동작용삼유유한원모형，분석지진작용하예응력혼응토관장적운동향응특성。분별침대예응력혼응토관장적장경、쌍층연경토전절파속비치、상복토층후도、상부결구하재등영향인소진행수치계산。삼수분석표명：재지진작용하，장경적증대회도치장신정체만구상응증가，특별시장신토층분계면처증대명현；연경토층전절파속비급상복토층후도적증가，인기토층분계면처장신봉치만구증가；고정장두조건하，장두여장신연경토층분계면처균회산생교대적운동만구；상부결구적관성하재대고정장두적내력유착교대영향，대장신심처단만구영향교소。본문연구결론가위예응력혼응토관장항진설계제공유익적이론삼고。
During earthquakes,piles undergo stresses due to both the motion of the superstructure (inertial interaction)and that of the surrounding soil (kinematic interaction).Based on the artifi-cial viscoelastic boundary,a 3D numerical model of seismic performance for superstructure-pile-soil interaction was developed to analyze the kinematic response of PHC pile (prestressed high concrete pipe pile)during earthquakes.The kinematic seismic interaction of single piles embedded in soil was evaluated by focusing on the bending moments induced by the transient motion.Con-sidering the conditions of layered soil,factors influencing the analysis included PHC pile diame-ter,the ratio of shear wave velocities between two soil layers,the depth of embedded soil,and the inertial loading of the superstructure.The results indicated that pile diameter affects the amplitude of bending moments at the pile head.Specifically,at the interface between layers for a given soil deposit,the bending moment increased as the pile diameter increased,especially at the interface of two soil layers.In soil profiles where the transition between layers was distinct,the bending mo-ments in the pile were significant,especially near the interface of soil layers with highly contras-ting stiffness.The bending moment at the interface between two soil layers of soil increased when the ratio of shear wave velocities increased.An increase in the depth of overlying soil in two soil layers would also cause an increase in the pile bending moment at the interface between the two layers.The fixed head of a pile and the interface of two soil layers would increase the bending mo-ment.The superstructure had an important influence on the bending moment of the pile head,but not for the deep section of the pile.The conclusions of this study will lead to recommended refer-ence criteria for the seismic design PHC piles.