• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Behavior up to Ultimate State and Analysis of Unbonded Prestressed Simple and Continuous Beams

Research Project

Project/Area Number 06650503
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 土木材料・力学一般
Research InstitutionOsaka Institute of Technology

Principal Investigator

KOBAYASHI Kazuo  Osaka Institute of Technology, Engineerig, Professor, 工学部, 教授 (10021586)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1995: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1994: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsUnbonded prestressing steel / Simple-span beam / Continuous-span beam / Flexural loading test / Behavior at ultimate state / Theoretical analysis / アンボンドPC
Research Abstract

The pesent study consists of two test series. The purpose of series A tests is to examine the structural behavior at the ultimate state including falling branch region after the maximum strength of unbonded beams without bond of prestressing steel in comparison with those of bonded beams. In series B tests, on the other hand, the load carrying behavior up to the ultimate state of two-span continuous unbonded prestressed concrete beams was studied experimentally and theoretically.
It was shown from series A studies on simple beams that 1) maximum resisting flexural moment decreased with increasing shear span length at a given total span length/effective depth ratio (L/d) in unbonded beams, 2) reduction in the maximum flexural strength of unbonded beam in comparison with bonded beam became remarkable with increasing L/d ratio, 3) effect of location of load-points on attainable stress in unbonded prestressing steel at the maximum ultimate moment was significant in case of low L/d ratio. 4) … More maximum flexural strength of unbonded beam scarcely reduced even when subjected to pre-loading up to 75% of the maximum ultimate moment at a short shear span extremely different from post-loading, and then 5) load carrying behavior in particular at the ultimate state including falling branch of unbonded beams could be estimated well by an analitical method considering compatibility condition of elongation in unbonded steel and concrete over total span length.
Nextly, series B studies on continuous-span beams showed that 1) ultimate flexural strength of unbonded beam was lower by 10-20% than that of comparable bonded beam, which could be estimated well by using appropriate value of compatibility factor for unbonded prestressing steel and applying limit analysis, 2) member rigidity and stress increase in prestresing steel after flexural cracking were considerably small in unbonded beam than bonded one, 3) moment redistribution initiated after flexural cracking, but no significant difference could be recongnized in load-moment relations at loading point or intermediate support between unbonded and bonded beams, and 4) structural behavior up to the ultimate state after cracking of prestressed concrete continuous beams such as moment redistribution, prestressing steel stress and deflection could be estimated well applying nonlinear analysis, in which compatibility factor for prestressng steel was set to be 1.0 and 0.2 for bonded beam and unbonded beam, respectively. Less

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 政氏信之、小林和夫 他: "アンポンドPCはり部材の耐荷特性に関する一考察" コンクリート工学年次論文報告集. 16巻、2号. 925-930 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 西永卓司、小林和夫 他: "アンポンドPCを適用した連続はりの耐荷特性に関する一考察" コンクリート工学年次論文報告集. 17巻、2号. 713-718 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 西永卓司、小林和夫 他: "アンポンドPC連続はりの終局状態までの耐荷挙動に関する研究" コンクリート工学年次論文報告集. (予定). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] N.Masauji, K.Kobayashi et al.: "Study on Load Carrying Behavior of Unbonded Prestressed Cncrete Beams" Proc.of Japan Concrete Institute. Vol.16, No.2. 925-930 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Nishinaga, K.Kobayashi et al.: "Study on Load Carrying Behavior of Unbonded Prestressed Concrete Continuous Beams" Proc.of Japan Concrete Institute. Vol.17, No.2. 713-718 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Nishinaga, K.Kobayashi et al.: "Study on Load Carrying Behavior up to Ultimate State of Unbonded Prestressed Concrete Continuous Beams" Proc. of Japan Concrete Institute. Vol.18 (in contribution). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 政氏信之、小林和夫 他: "アンボンドPCはり部材の耐荷特性に関する一考察" コンクリート工学年次論文報告集. 16巻、2号. 925-930 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] 西永卓司、小林和夫 他: "アンボンドPCを適用した連続はりの耐荷挙動に関す一考察" コンクリート工学年次論文報告集. 17巻、2号. 713-718 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 西永卓司、小林和夫 他: "アンボンドPC連続はりの終局状態までの耐荷特性に関する研究" コンクリート工学年次論文報告集. (予定). (1996)

    • Related Report
      1995 Annual Research Report

URL: 

Published: 1994-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi