Mechanism and Prevention of Dynamic Failure of Concrete Structures Due to Destructive Earthquakes

破坏性地震混凝土结构动力破坏机理及防治

• 批准号: 09044178
• 负责人: TANIMURA Shinji
• 金额: $ 1.98万
• 依托单位: Osaka Prefecture University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 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-09044178/
• 关键词: Great Hanshin-Awaji Earthquake; Failure; Numerical Analysis; Bi-Characteristic Method; Finite Element Method; Discrete Element Method; Near Source Earthquake; Transitional Response; 阪神・淡路大震災; 低速度衝撃; 三次元動的有限要素法; T型長柱; 鋼製門型橋脚

The Great Hansthn-Awaji Earthquake which occurred on January 17, 1995 caused destructive failures in many buildings and architectural structures. In such failures, several specific destructive patterns emerged, that have not been observed in usual earthquakes which occurred in the past.The characteristic patterns of failures due to this earthquake are, for example, the crack initiation and development in horizontal direction in many buildings, and compressive fractures in concrete structures with reinforced bars. Such phenomena are not explained by static loading and/or the vibration mechanics, therefore an analysis in the term of the dynamic mechanics and dynamic fracture mechanics may be necessary to clarify the mechanism of those failures and to find out the method to prevent them.In the present research deformation and failure of reinforced concrete structures subjected to dynamic loading were both numerically and experimentally investigated, and based on the analytical results we … More tried to c1arify the mechanism of dynamic failure of concrete structures due to destructive earthquakes such that prevention measures can be taken.Numerical analyses for T-type column models and Gate-type column models were performed by using the bi-characteristics^<(2)(4)(6)> method and dynamic finite element method, DYNA-2D and 3D^<(9)(12)> In the bi-characteristic method analyses, we introduced a new algorism to treat the stress pmpagation in an anisotropic medium^<(1)(5)(11)> and also to treat partial impact^<(3)(7)(8)> or eccentric impact problems^<(10)>, and the obtained numerical results were then compared with the corresponding experimental results. It was found that the rate of applied force against the time in the initial and final stage of impact and the boundary conditions of the target medium deeply influence the magnitude of the stress concentration in anisotropic bodies. As for the partial impact problem of long bars with rectangular cross sections, a new numerical algorithm was found to work reasonably and the calculated magnitudes and positions of stress concentration showed fairly good agreement with the experimental results.In the analyses by DYNA 2D and DYNA 3D, it was found that the values of the dynamic stress induced in the structures are affected not only by the magnitude of the oscillation of the ground motion but also by the time derivatives of the ground velocity, the boundary conditions between the column and its upper structure^<(9)>. Less

1995年1月17日发生的汉森-淡路大地震导致许多建筑物和建筑结构遭到破坏。在此类破坏中，出现了几种在过去发生的普通地震中未曾观察到的特定破坏模式。这次地震导致的破坏的特征模式是，例如，许多建筑物在水平方向上裂纹萌生和发展，以及钢筋混凝土结构中的压缩断裂。这种现象无法用静载和/或振动力学来解释，因此可能有必要进行动态力学和动态断裂力学方面的分析，以阐明这些失效的机理并找出防止它们的方法。在目前的研究中，对动载下钢筋混凝土结构的变形和失效进行了数值和实验研究，并根据分析结果，我们尝试... 更多 利用双特征^<(2)(4)(6)>法和动力有限元法、DYNA-2D和3D^<(9)(12)>双特征法对T型柱模型和门型柱模型进行数值分析。 通过分析，我们引入了一种新的算法来处理各向异性介质中的应力传播^<(1)(5)(11)>以及处理部分冲击^<(3)(7)(8)>或偏心冲击问题^<(10)>，并将获得的数值结果与相应的实验结果进行了比较。研究发现，冲击初始和最终阶段的施加力速率与时间的关系以及目标介质的边界条件深刻影响各向异性体中应力集中的大小。针对矩形截面长杆的局部冲击问题，发现一种新的数值算法能够合理工作，计算出的应力集中大小和位置与试验结果吻合较好。通过DYNA 2D和DYNA 3D分析发现，结构中诱发的动应力值不仅受到地震动振荡幅度的影响，还受到结构振动的影响。 地面速度的时间导数，柱与其上部结构之间的边界条件^<(9)>。较少的

项目成果

K.Liu, X.Li and S.Tanimura: "“Two-Dimensional Stress Wave Propagation in a Transversely Isotropic Cylinder"" JSME International Journal. 40-2, Ser.A. 128-134 (1997)

K.Liu、X.Li 和 S.Tanimura：“横向各向同性圆柱体中的二维应力波传播”，JSME 国际期刊 40-2，Ser.A。

K.Liu and S.Tanimura: "“Numerical Analysis of Dynamic Stress Concentration in a Square Block Due to Impact"" International Journal of Impact Engineering. 19-8. 653-666 (1997)

K.Liu 和 S.Tanimura：“方形块因冲击而产生的动态应力集中的数值分析”，《国际冲击工程学报》19-8 653-666 (1997)。

K.Liu, X.Li, Y.Tan and S.Tanimura: "“Stress Wave Propagation in a Layered Orthotropic Medium"" Proceedings of the 3rd International Symposium on IMPACT ENGINEERING'98. (1998)

K.Liu、X.Li、Y.Tan 和 S.Tanimura：““层状正交各向异性介质中的应力波传播””第三届冲击工程国际研讨会98 论文集。（1998 年）

K.Liu, K.Mimura and S.Tanimura: "Dynamic Behavior of Rectangular Bars Due to Eccentric Lomgitudinal Impact Loading" Proceedings of the 3rd International Symposium on IMPACT ENGINEERING'98, Singapore. (1998)

K.Liu、K.Mimura 和 S.Tanimura：“偏心纵向冲击载荷引起的矩形杆的动态行为”第三届冲击工程 98 国际研讨会论文集，新加坡。

K.Liu, S.Xie and S.Tanimura: "Two-Dimensional Torsional Weve Propagation in Layered Transversely Isotropic Cylinders" JSME International Journal. 41-2, Ser.A. 107-115 (1998)

K.Liu、S.Xie 和 S.Tanimura：“层状横向各向同性圆柱体中的二维扭转编织传播”JSME 国际期刊。