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Study on Aseismic Design of High Ductility Aseicmic Joint Spliced Pile Foundation

高延性抗震接缝拼接桩基础抗震设计研究

基本信息

批准号：
09555146
负责人：
MIURA Fusanori
金额：
$ 2.69万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555146/
关键词：
Pile Foundation Aseismic Design High Ductility Aseismec Joint Liquefaction Lateral ground movements Level 2 earthquake motion Geometric nonlinearity Material nonlinearity 側方流動耐震ジョイント非線形解析動的解析連成解析

项目摘要

Instead of traditional welding splicer, a new High Ductility Aseismic Joint (HDAJ) was developed. We first, conducted a series of bending experiments to elucidate the characteristics of the new splicing. Then, we simulated the results of the experiments by using a nonlinear finite element method which took into account both geometric and material nonlinearities to show the validity of the method. By using the method, we performed parametric study to investigate the effectiveness of HDAJ spliced piles when subjected to liquefaction-induced large ground displacements. The numerical analyses revealed that the pile structure would sustain ground displacements almost twice the magnitude of that sustained by ordinary Pre-stressed High strength Concrete (PHC) piles for a given load.Although the effectiveness of HDAJ spliced pile when subjected to liquefaction-induced large ground displacements was shown, dynamic response analyses must be done. Because the HDAJ spliced pile is extremely deferr … More able, large response displacements might be caused by strong earthquake motions and exceed the allowance, which becomes a drawback of the HDAJ spliced pile. On the contrary, if the response displacement is same or less level compared with that of PHC. Piles, the bending moment induced in the HDAJ spliced pile would be extremely reduced. This means that the HDAJ spliced pile will be sustain the strong earthquake motion while ordinary piles will yield plastic hinges due to excess bending moments.From this point of view, we performed dynamic response analyses to investigate the effectiveness of HDAJ spliced piles subjected to strong earthquake motions by using nonlinear FEM. Prior to the numerical analyses, we conducted cyclic bending tests under axial loads of HDAJ spliced piles and PHC piles. By modeling the bending moments-rotational angle relationships from the experiments, we carried out parametric dynamic analyses, by changing ground models, input motions, and so on. The main results are:(1)The maximum response displacements of HDAJ spliced piles are not larger than those of ordinary PHC piles.(2)The maximum bending moments induced in piles are remarkably reduced by introducing the HDAJ which means that the HDAJ increases the safety of pile foundation system. Less

开发了一种新型高延性抗震接头 (HDAJ)，取代了传统的焊接接头。我们首先进行了一系列弯曲实验来阐明新型拼接的特性。然后，我们利用考虑几何和材料非线性的非线性有限元方法对实验结果进行了模拟，以证明该方法的有效性。通过使用该方法，我们进行了参数研究，以研究 HDAJ 拼接桩在遭受液化引起的大地面位移时的有效性。数值分析表明，在给定荷载下，该桩结构可承受的地面位移几乎是普通预应力高强混凝土 (PHC) 桩所承受地面位移的两倍。虽然 HDAJ 拼接桩在承受液化引起的大地面位移时的有效性已得到证明，但仍必须进行动力响应分析。由于HDAJ拼接桩具有极强的延缓能力，强震时可能会引起较大的响应位移，超出允许范围，这成为HDAJ拼接桩的一个缺点。相反，如果响应位移与PHC的响应位移相同或更低。 HDAJ拼接桩中引起的弯矩将大大减少。这意味着HDAJ拼接桩将承受强地震作用，而普通桩将因过度弯矩而产生塑性铰。从这一点出发，我们利用非线性有限元法进行动力响应分析，研究HDAJ拼接桩在强地震作用下的有效性。在进行数值分析之前，我们对HDAJ拼接桩和PHC桩进行了轴向载荷下的循环弯曲试验。通过对实验中的弯矩-旋转角度关系进行建模，我们通过改变地面模型、输入运动等进行参数化动态分析。主要结果为：(1)HDAJ拼接桩的最大响应位移不大于普通PHC桩。(2)引入HDAJ后，桩内最大弯矩显着降低，提高了桩基系统的安全性。较少的