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Seismic fault model for calculating exactly the dynamic motion in the stick phase and generation of short-period seismic motion

Research Project

Project/Area Number 15560483
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Building structures/materials
Research InstitutionTohoku University

Principal Investigator

KURITA Satoshi  Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (90195553)

Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2004: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2003: ¥2,700,000 (Direct Cost: ¥2,700,000)
KeywordsFault model / Friction / Seismic motion / Stopping phase / Stick phase / Finite element method
Research Abstract

This research project proposed a numerical method for calculating the enact motions in the stopping phase on fault planes that the hitherto developed methods are incapable of simulating. The method was applied to the simulation of the observed motions obtained by a frictional experiment.
First, the review of the analytical methods for the dynamic motions in the slippage and stopping phases on fault planes was performed The review clarified the numerical problems in analyzing the dynamic frictional behavior of fault planes : 1.the number of degree of freedom of the nodes on a fault plane is different between the stopping phase and sliding phase, 2.artificial short-period seismic motions are produced by the inaccuracy of the estimated time when a sliding will stop. 3.the numerical accuracy of dynamic motions in bi-directional sliding is worse than that in one-directional sliding. Secondly, in order to solve problem 1.a novel idea was found out. The idea is that the motions of the two body contacted in the stick phase are the same as those of the two body in the sliding phase which are slipping at the slip velocity of zero. From the idea, the identical equation of motion for the stick and the sliding phases were derived. For solving the problem 2.the definition was introduced that the slippage velocity and acceleration reach to zero simultaneously when the slippage ceases. By applying the definition to the Newmark's integration method, a numerical method to calculate the exact time when the slippage ceases without iteration was proposed. Finally, the accuracy of the proposed numerical methods were validated by simulating a sliding experiment that had been performed for sliding bearings for base isolated buildings. This experimental data were adapted since there was no experimental data seismic fault slippage including the motions in the stoppingphase.

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (3 results)

All 2003 Other

All Journal Article (2 results) Publications (1 results)

  • [Journal Article] 剛滑り支承免震建物のせん断多質点系応答解析法2003

    • Author(s)
      栗田 哲, 千葉大輔, 杉村義広
    • Journal Title

      日本建築学会構造系論文集 574

      Pages: 69-75

    • NAID

      110004092370

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] NUMERICAL TECHNIQUE FOR RESPONSE ANALYSIS OF SHEAR BUILDINGS OF MULTI-DEGREE OF FREEDOM ISOLATED WITH SLIDING BEARINGS2003

    • Author(s)
      Satoshi KURITA, Daisuke CHIBA, Yoshihiro SUGIMURA
    • Journal Title

      JOURNAL OF STRUCTURAL AND CONSTRUCTION ENGINEERING 574

      Pages: 69-75

    • NAID

      110004092370

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] 栗田 哲, 千葉大輔, 杉村義広: "剛滑り支承免震建物のせん断多質点系応答解析法"日本建築学会構造系論文集. 574. 69-75 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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