A Study on Amplification Characteristics of Seismic Ground Motions on Irregularly Layered Structures

不规则层状结构地震动放大特性研究

• 批准号: 01420033
• 负责人: KURIBAYASHI Eiichi
• 金额: $ 6.66万
• 依托单位: Toyohashi University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01420033/
• 关键词: Array System for Strong Earthquake Motions; Irregularly Layered Structures; Seismic Waves; Boundary Element Method; Response Analysis; Aseismatic Design; Reflectively Method; Amplification Characteristics of Seismic Ground Motions; 常時微動観測

l. Details of researchTo elucidate the effects of topography and underground conditions in behavior of ground motions is an important task in earthquake engineering. In order to prove the effects of topographical and geological conditions in behavior- of ground motions, an array system foiseismic ground motion was set up around Toyohashi University of Technology as the investigated area, and until now eight times of earthquake have been recorded in total. These data were analyzed in time and frequency domain. Further more, response analysis based on actual ground conditions of the investigated area has been performed. The results of comparison between experimental and theoretical analysis are as follows.2. Results of research(1) The resonance frequency with maximum amplitude does not depend on the local depth of the soft soil.(2) Amplitudes are the largest at the center of the valley, and are getting smaller as nearing on the both ends of the valley.(3) Amplification characteristics of the valley are not influenced by the incident angle of the wave and the impedance of the ground.(4) At present, to calculate the three-dimensional response of complicated layered structures, the extending Aki-Larner technique is carried out.3. Research program for the futureIn 1992 academic year, an accelerometer was installed on the basis and three-dimensional model of the investigated area is designed. So the system is completed as the ai-ray system for strong ground motion observation to investigate the amplification characteristic of seismic ground motions- on irregularly layered structures.In the future, we will practice the ground motion observation and experimental and theoretical analyses.

L.研究的细节阐明地形和地下条件对地震动特性的影响是地震工程中的一项重要任务。为了验证地形地质条件对地震动特性的影响，以丰桥工业大学为研究区域，建立了地震动台阵系统，迄今为止共记录到8次地震。这些数据进行了分析，在时域和频域。并根据研究区的实际地基条件进行了响应分析。实验结果与理论分析的对比结果如下.研究结果表明：（1）最大振幅共振频率与局部土层深度无关。(2)山谷中心的振幅最大，越靠近山谷的两端，振幅就越小。(3)山谷的放大特性不受波的入射角和地面阻抗的影响。(4)目前，对于复杂层状结构的三维响应计算，主要采用扩展的Aki-Larner方法. 1992学年，在基础上安装了加速度计，并设计了调查区的三维模型。该系统作为研究不规则层状结构地震动放大特性的强地震动观测系统，将在今后的工程实践中进行地震动观测、实验和理论分析。

项目成果

栗林 栄一: "Study of an Assessment for Site Effect of Seismic Strong Motion" Proc.,5th International Conference on Soil Dynamics and Earthquake Eng.,Karlsruhe,Germany. 23-33 (1991)

Eiichi Kuribayashi：“地震强震场地效应评估研究”，第五届土壤动力学和地震工程国际会议，德国卡尔斯鲁厄，23-33 (1991)。

小松 広和: "Study on Lateral Resistance of Minipile" Proc.,The Eighth Japan Earthquake Eng.,Symposium. 2. 1245-1250 (1990)

小松博和：“微型桩的侧向阻力研究”，第八届日本地震工程研讨会，2. 1245-1250 (1990)。

栗林 栄一: "Engineering Tactics on Lifelines Safety Against Earthquake" Proc.,Third U.S.Conference on Lifeline Earthquake Eng.,Los Angeles,CA,ASCE. 927-936 (1991)

Eiichi Kuribayashi：“抗震生命线安全工程策略”，第三届美国生命线地震工程会议，洛杉矶，CA，ASCE 927-936 (1991)。

西岡 省三: "地盤の不整形性が地震動特性へ与える影響に関する研究" 平成2年度土木学会年次講演会講演概要集. 1. 1090-1091 (1990)

Shozo Nishioka：“地面不规则性对地震运动特性的影响研究”1990年日本土木工程师学会年会摘要1. 1090-1091（1990）。

Shozo Nishioka: "A Study on Amplification Characteristics of Seismic Ground Motions on Irregularly Layered Structures" Proc., 45th Annual Conference of the Japan Society of Civil Engineers. 1. 1090-1091 (1990)

Shozo Nishioka：“不规则层状结构地震地面运动放大特性的研究”，第 45 届日本土木工程学会年会。