Quantitative evaluation method for seismic control effects due to the sidewall of embedded foundation

预埋基础侧壁抗震效果定量评价方法

• 批准号: 01550442
• 负责人: YOSHIDA Ngayuki
• 金额: $ 1.28万
• 依托单位: Hiroshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550442/
• 关键词: Earthquake; Dynamic interaction; Impedance; Seismic exciting force; Embedded foundation; Backfilled soil; Separation; Sliding; 地盤; 基礎; 相互作用; 境界積分方程式法; 制震

The present research developed a new analytical method for the three dimensional dynamic interacion in the frequency domain which can deal with arbitrary shapes of embedded foundation and visco-elastic multi-layered soil by using a 32bit high quality WORK STATION.The summary of the method is as follows. The outer domain of a soil is analyzed by indirect boundary integral equation method in the thin layered soil model. The inner domain which contains an irregular soft soil is discretized using the axi-symmetric isoparametric finite elements. Combining equations for the total domain are obtained by applying the principle of virtual displacements to the stiffness equation of the outer domain.The results obtained by numerical analyses are as follows. The rigidly backfilled soil reduces the maximum response of the superstrucure with the relatively short natural period. Convesely the softly backfilled soil is usefull for the structure with the relatively long natural period.To investigate the effects of the sidewall on the actual responses of the embedded structure to real earthquake, we obtained the observed data of a reinforced concrete tower with acceleration seismographes and soil pressure guages, and globally evaluated the effects of the sidewalls by comparison of the response spectra of the tower with the theoretical results in the frequency range obtained by using a parameter representing the effective degree of soil pressure along the sidewall.

本文在32位高性能工作站上建立了一种新的三维动力相互作用频域分析方法，该方法可以处理任意形状的埋置基础和粘弹性多层地基。在薄层土模型中，采用间接边界积分方程法对土的外部区域进行了分析。采用轴对称等参元对含有不规则软土的内域进行离散。将虚位移原理应用于外区域的刚度方程，得到了全区域的组合方程，并进行了数值分析。刚性回填土降低了上部结构的最大反应，自振周期相对较短。为了研究侧壁对埋置结构在真实的地震作用下的实际反应的影响，采用加速度地震仪和土压力计对一钢筋混凝土塔楼进行了观测，并通过比较塔的反应谱与通过使用代表反应谱的参数获得的频率范围内的理论结果，土压力沿侧墙沿着的有效程度。

项目成果

吉田 長行: "結合解法による地盤と基礎の3次元動的相互作用解析" 日本建築学会 構造系論文報告集. 421. (1991)

Nagayuki Yoshida：“使用耦合解法对地面和基础进行三维动态相互作用分析”日本建筑学会结构系统论文报告421。（1991）

吉田長行: "結合解法による地盤と基礎の3次元動的相互作用解析" 日本建築学会 構造系論文報告集.

Nagayuki Yoshida：《使用耦合解法进行地基与地基的三维动态相互作用分析》日本建筑学会结构研究论文集。

Nagayuki Yoshida,: "Dynamic response characteristics of a rigid cylindrical foundation with the backfilled soil" Journal of structural and construction engineering. 405. 103-113 (1989)

Nagayuki Yoshida，“回填土的刚性圆柱形基础的动力响应特性”结构与建筑工程杂志。

Nagayuki Yoshida,: "Three-dimensional dynamic interaction analysis of soil and foundation with a hybrid metod" Journal of structural and construction engineering. 421. 89-99 (1991)

Nagayuki Yoshida，：“使用混合方法进行土壤和地基的三维动态相互作用分析”结构与建筑工程杂志。

吉田 長行: "埋戻し土を考慮した円筒剛基礎の動的応答特性" 日本建築学会 構造系論文報告集. 405. 103-113 (1989)

Nagayuki Yoshida：“考虑回填土的圆柱形刚性基础的动力响应特性”日本建筑学会结构论文报告405. 103-113（1989）