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A Study of Estimation for Steel Bridge Piers considering torsion effects

Research Project

Project/Area Number 12450183
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 構造工学・地震工学
Research InstitutionNagoya University

Principal Investigator

USAMI Tsutomu  Grad.School of Eng., Nagoya Univ., Professor, 工学研究科, 教授 (50021796)

Co-Investigator(Kenkyū-buntansha) KASAI Akira  Grad.School of Eng., Nagoya Univ., Research Assoc., 工学研究科, 助手 (20303670)
GE Hanbin  Grad.School of Eng., Nagoya Univ., Assoc.Professor, 工学研究科, 助教授 (90262873)
ITOH Yoshito  Center for Integrated Research in Sci.and Eng., Nagoya Univ., Professor, 理工科学総合研究センター, 教授 (30111826)
SUZUKI Moriaki  Grad.School of Eng., Aichi Institute of Technology, Assoc.Professor, 工学部, 助教授 (90273276)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥15,000,000 (Direct Cost: ¥15,000,000)
Fiscal Year 2002: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 2001: ¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 2000: ¥4,200,000 (Direct Cost: ¥4,200,000)
KeywordsSteel Bridge Piers / Local Buckling / Torsional deformation / Seismic Performance / Elasto-plastic Analysis / Cyclic loading tests / Out-of-plane deformation / Serviceability / 弾塑性有限変立解析
Research Abstract

The present study is aimed at an estimation of steel bridge piers subjected to out-of-plane cyclic loading. For this purpose, Elastoplastic analysis was carried out at fast considering torsion effect Next, these numerical results were verified by the seismic performance tests of Inverted L-shaped steel bridge piers. Finally, the experimental functions estimating the strength and deformation capacity for steel bridge piers subjected to out-of-plane cyclic loadings are developed. The following conclusions can be obtained :
1) With the increase in eccentric distance, the loading-carrying capacity of the columns is greatly reduced.
2) Comparison of the buckling modes indicates that the out-of-plane bending moment dominates the hysteretic behavior of the columns, and the inward deformation on the eccentric side is attributed to the effect of the cyclic twisting moment.
3) The seismic performance testing system for inverted L-shaped steel bridge piers was developed.
4) The eccentricity ratio e/r is selected as 0, 2 and 3, and its influences on the inelastic behavior, ultimate strength and ductility are investigated. It is found that the Inverted L-shaped steel bridge pier deformaed largly in the in^plane direction although the pier was loaded in the out-of-plane direction.
5) From the analytical results, it is realized that the eccentric vertical load and cyclic loading pattern will cause a significant in-plane displacement, and in the case of inverted L-shaped piers, strength deterioration is greater than that of T-shaped piers.
6) An extensive parametric analysis is performed to propose empirical formulas in order to evaluate strength and ductility of inverted L-shaped box-section steel bridge piers.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 葛漢彬, 高聖彬, 宇佐美勉: "鉛直荷重が偏心して作用する鋼製橋脚の操り返し弾塑性挙動に関する数値解析的研究"土木学会論文集. No.654/I-52. 271-284 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Shengbin Gao, Tsutomu Usaim, Hanbin Ge: "Eccentrically Loaded Steel Columns under Cyclic Out-of-plane Loading"Journal of Structural Engineering. Vol.126, No.8. 974-981 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 青木微彦, 錦木真一, 渡辺俊輔, 鈴木森晶, 宇佐美勉, 葛漢彬: "面外繰り返し水平力を受ける逆L型鋼製箱形断面橋脚の強度と変形能に関する実験的研究"土木学会論文集. No.724/I-62. 213-223 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 葛漢彬, 渡辺俊輔, 宇佐美勉, 青木徹彦: "面外繰り返し外力を受ける逆L形鋼製箱形断面橋脚の耐震性能に関する解析的研究"土木学会論文集. (登載予定).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ge, H., Gao, S.and Usami, T.: "Numerical Study on Cyclic Elastoplastic Behavior of Eccentrically Loaded Steel Bridge Piers"J.of Struct.Mech.and Earthquake Eng., JSCE. No.654/I-52. 271-284 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Gao, S., Usami, T.and Ge, H.: "Eccentrically Loaded Steel Columns under Cyclic Out-of-plane Loading"J.of Structural Engineering, ASCE. Vol.126, No.8. 974-981 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Aoki, T., Suzuki, S., Watanabe, S., Suzuki, M., Usami, T.and Ge, H.: "Experimental Study on Strength and Deformation Capacity of Inverted L-Shaped Steel Bridge Piers Subjected to Out-of-Plane Cyclic Loading"J.of Struct.Mech.and Earthquake Eng., JSCE. No.654/I-52. 271-284 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ge, H., Wataname, S., Usami, T., and Aoki, T.: "Analytical Study on Strength and Deformation Capacity of Inverted L-Shaped Steel Bridge Piers Subjected to Out-of-Plane Cyclic Loading"J.of Struct.Mech.and Earthquake Eng., JSCE. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 青木徹彦, 鈴木真一, 渡辺俊輔, 鈴木森晶, 宇佐美勉, 葛漠彬: "面外繰り返し水平力を受ける逆L型鋼製箱形断面橋脚の強度と変形能に関する実験的研究"土木学会論文集. No.724/I-62. 213-223 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Liu, Q., Kasai, A., Usami, T.: "Two hysteretic models for thin-walled pipe-section steel bridge piers"Engineering Structures. Vol.23. 186-197 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 宇佐美勉, 織田博孝: "鋼構造物の耐震解析法および耐震照査法に関する研究展望"土木学会論文集. No.668/I-54. 1-16 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Chusilp, P., Usami, T.: "New elastic stability formulas for multiple-stiffened shear panels"Journal of Structural Engineering,ASCE. (掲載予定). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Chusilp, P., Usami, T., Ge, H.B.: "Analytical study on strength and ductility of stiffened box-shaped steel members subjected to shear loading"Journal of Structural Engineering,JSCE. (掲載予定). (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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