首页> 外文会议>World conference on earthquake engineering;WCEE >A STUDY ON THE CHARACTERISTICS OF DYNAMIC HORIZONTALSUBGRADE REACTION FOR DIFFERENT TYPES OF GROUND BYCENTRIFUGE MODEL EXPERIMENTS USING SINGLE PILE MODELS
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A STUDY ON THE CHARACTERISTICS OF DYNAMIC HORIZONTALSUBGRADE REACTION FOR DIFFERENT TYPES OF GROUND BYCENTRIFUGE MODEL EXPERIMENTS USING SINGLE PILE MODELS

机译:基于单桩模型的离心模型试验研究不同类型地面的动态水平路基反应特性

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In pile foundation seismic design, it is necessary to appropriately evaluate the response ofdynamic interaction of piles and the ground and vibration characteristics (natural period)depending on ground conditions. In this study, static horizontal loading and dynamic vibrationtests of single pile models were conducted using centrifuge model tests in a 50 G field for sandysoil ground, as well as for clayey soil ground and volcanic ash ground. Accordingly, basicearthquake-proof evaluation focused on the pile ground spring constant was conducted. The p-δmethod, which focuses on the relative displacement of piles and ground during earthquakes, andthe eigenvalue analysis method for calculation of dynamic subgrade reaction from the naturalfrequency of piles were used as analysis methods. Results showed that the dynamic coefficientKhe of the horizontal subgrade reaction of piles must be properly determined by comprehensiveevaluation based on differences in strength characteristics and other earthquake performance foreach ground type rather than only determining Khe from the relationship with the staticcoefficient Kh of horizontal subgrade reaction (Kh = α Khe), or from shear elastic waves and otherfoundation strength constants.
机译:在桩基抗震设计中,有必要根据地面情况适当评估桩与地面的动力相互作用的响应以及振动特性(自然周期)。在这项研究中,单桩模型的静态水平荷载和动态振动测试是在50 G田地的砂土地面,黏性土壤地面和火山灰地面上使用离心模型试验进行的。因此,进行了以桩基的地弹簧常数为中心的基本抗震性评价。以地震过程中桩与地面的相对位移为重点的p-δ法,以及根据桩的固有频率计算动态路基反应的特征值分析法。结果表明,必须根据每种地面类型的强度特性和其他抗震性能的差异,通过综合评估适当确定桩的水平路基动力系数Khe,而不仅仅是根据与水平路基静力系数Kh(Kh =αKhe),或来自剪切弹性波和其他基础强度常数。

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