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

开发了一种新的高延展性无性抗震动关节（HDAJ），而不是传统的焊接拼接器。我们首先进行了一系列弯曲实验，以阐明新剪接的特征。然后，我们使用非线性有限元方法模拟了实验的结果，该方法考虑了几何和材料非线性以显示该方法的有效性。通过使用该方法，我们进行了参数研究，以研究HDAJ剪接的钢琴的有效性，当时受到液化诱导的大地面位移的影响。数值分析表明，该桩结构将维持地面位移的数量几乎是普通的预压力高强度混凝土（PHC）钢琴所维持的幅度的两倍。因为HDAJ剪接桩极为延迟……更有能力，因此大型响应位移可能是由强烈的地震运动引起的，并且超过了允许量，这成为HDAJ剪接的桩的缺点。相反，如果响应位移与PHC相比相同或更少。桩，HDAJ剪接桩中引起的弯矩将极大地减少。这意味着HDAJ剪接的桩将维持强烈的地震运动，而普通的钢琴将产生由于超出弯矩而产生的塑料铰链。从这种观点来看，我们进行了动态反应分析，以研究HDAJ剪接的钢琴的有效性，该钢琴的有效性是使用非线性的fire使用非线性em firafe the The HDAJ。在进行数值分析之前，我们在HDAJ剪接钢琴和PHC钢琴的轴向载荷下进行了环状弯曲测试。通过对实验的弯曲矩旋转角度关系进行建模，我们通过更改地面模型，输入运动等进行了参数动态分析。主要结果是：（1）HDAJ剪接钢琴的最大响应位移不高于普通PHC钢琴的最大响应位移。（2）通过引入HDAJ，这意味着HDAJ会提高桩基粉底系统的安全性，从而大大降低了钢琴中诱导的最大弯矩。较少的