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Modeling of Onset of Spalling of Concrete during Fire by Pore Pressure Rise

Research Project

Project/Area Number 12450235
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Architectural environment/equipment
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

HARADA Kazunori  Graduate School of Engineering, Assoc. Prof., 工学研究科, 助教授 (90198911)

Co-Investigator(Kenkyū-buntansha) TAKADA Satoru  Graduate School of Engineering, Instructor, 工学研究科, 助手 (20301244)
YAMAZAKI Masahiro  Graduate School of Engineering, Lecturer, 工学研究科, 講師 (60240826)
HOKOI Shuichi  Graduate School of Engineering, Professor, 工学研究科, 教授 (80111938)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥9,300,000 (Direct Cost: ¥9,300,000)
Fiscal Year 2002: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2001: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2000: ¥4,600,000 (Direct Cost: ¥4,600,000)
KeywordsConcrete / Spalling / Vapor Pressure / Thermal Stress / Heat and Mass Transfer / Stress Analysis / 空隙圧力 / 火災 / 高強度コンクリート / 含水率
Research Abstract

This work is concerned with; 1) Sensitivity analysis of thermal stress and pore vapor pressure upon the onset of spalling of concrete during fire, 2) experimental analysis by using small scale specimens and 3) development of computer code for simultaneous transfer of heat, mass (water vapor) and stress within concrete material. 1) As to the sensitivity analysis, a simple two-dimensional model for heat and mass transfer program was developed. Simulations were carried out for cylinders heated by standard time- temperature curve. The resulting thermal stress was calculated under the assumption of plane strain. It was found that the thermal stress is increased as the strength of concrete is increased. Comparing with thermal stress and pore pressure, thermal stress is dominant in magnitude. The effect of pore pressure may have certain effect, however pore pressure alone cannot be a main cause of spalling. Following the findings of sensitivity analysis. 2) experiments were conducted for cylindrical specimens of three different strength (40, 110 and 150 MPa). Axial loading and non-uniformity of heating were selected as parameters to be examined. The results showed at least qualitatively that frequency and degree of spalling is increased as strength is increased, that non-uniform heating cause the degree of spalling considerably and that existence of axial compression and end-restraint changes the depth of spalling to shallow layer. By summarizing above, it was suggested to analyze stress and pore pressure in the early stage of heating in three- dimensional field. Thus the simple model used in sensitivity analysis was extended into three dimensional model. In addition, the effect of pore pressure was explicitly taken into account by using the concept of uplift coefficient. The analytical results showed that the effect of non-uniform heating may cause large thermal stress in the early stage of heating.

Report

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

    (21 results)

All Other

All Publications (21 results)

  • [Publications] Fumie Arita, Kazunori Harada, Keiichi Miyamoto: "Thermal Spalling of High-Performance Concrete during Fire"Proceedings of the Second International Workshop on Structures in Fire(Christchurch). 253-271 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 有田史絵, 原田和典, 鉾井修一, 高田暁: "コンクリートの爆裂メカニズムに関する理論的考察"日本建築学会大会学術講演梗概集A-2. 11-12 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 有田史絵, 原田和典, 宮本圭一: "火災加熱を受けるコンクリートの内部亀裂に関する理論的考察"日本建築学会大会学術講演梗概集A-2. 29-30 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 有田史絵, 原田和典, 山崎雅弘: "火災加熱を受けるコンクリート材料内の熱水分応力伝達のモデル化"日本建築学会大会学術講演梗概集A-2. (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 有田史絵, 宮本圭一, 原田和典: "コンクリートの爆裂メカニズムに関する実験的研究-要因及び破壊性状について-"日本火災学会研究発表会概要集. 494-497 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Fumie Arita, Kazunori Harada, Keiichi Miyamoto: "Thermal Spalling of High-Performance Concrete during Fire"Proceedings of the Second International Workshop on Structures in Fire (Christchurch). 253-271 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Fumie ARITA, Kazunori HARADA, Shuichi HOKOI, Satoru TAKADA: "A Theoretical Consideration of Spalling Mechanism of Concrete"Summaries of Technical Papers, A2, Architectural Institute of Japan. (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Fumie ARITA, Kazunori HARADA, Keiichi MIYAMOTO: "A Theoretical Consideration of Internal Crack Initiations of Concrete during Fire"Summaries of Technical Papers, A2, Architectural Institute of Japan. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Fumie ARITA, Masahiro YAMAZAKI, Kazunori HARADA: "Modelling of Heat, Mass and Stress Transfer in Concrete During Fire"Summaries of Technical Papers, A2, Architectural Institute of Japan. in press. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Fumie ARITA, Keiichi MIYAMOTO, Kazunori HARADA: "Experimental Investigations on a Mechanism of Thermal Spalling of Concrete- Influencing Factors and the Failure Mode-"Proceedings of the Spring *nual Meeting, Japan Society of Fire Safety and Engineering. 494-497 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Fumie Arita, Kazunori Harada, Keiichi Miyamoto: "Thermal Spalling of High-Performance Concrete during Fire"Proceedings of the Second International Workshop on Structures in Fire (Christchurch). 253-271 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 有田史絵, 原田和典, 鉾井修一, 高田暁: "コンクリートの爆裂メカニズムに関する理論的考察"日本火災学会研究発表会概要集. 8-11 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] 有田史絵, 原田和典, 鉾井修一, 高田暁: "火災時におけるコンクリートの爆裂メカニズムに関する理論的考察"日本建築学会近畿支部研究報告集. 41号環境系. 201-204 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] 有田史絵, 宮本圭一, 原田和典: "コンクリートの爆裂メカニズムに関する実験的研究-要因及び破壊性状について-"日本火災学会研究発表会概要集. 494-497 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 有田史絵, 原田和典, 宮本圭一: "火災加熱を受けるコンクリートの内部亀裂に関する理論的考察"日本建築学会大会学術講演梗概集. A-2(防火). 29-30 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 有田史絵, 原田和典, 山崎雅弘: "コンクリート材料内の熱水分応力伝達のモデル化"日本火災学会研究発表会概要集. (採用決定). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Arita F., Miyamoto K., Harada, H.: "Thermal Spalling of High-Performance Concrete during Fire"Second International Workshop on Structures in Fire. 2002年3月(発表予定). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 有田史絵, 原田和典, 鉾井修一, 高田暁: "コンクリートの爆裂メカニズムに関する理論的考察"日本火災学会研究発表会概要集. 8-11 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 有田史絵,原田和典,高田暁,鉾井修一: "火災時におけるコンクリートの爆裂メカニズムに関する理論的検討"日本建築学会近畿支部研究報告集. 41号(発表予定). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 有田史絵,原田和典,高田暁,鉾井修一: "コンクリートの爆裂メカニズムに関する理論的検討"日本火災学会平成13年度春季研究発表会. (発表予定). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 有田史絵,原田和典,高田暁,鉾井修一: "コンクリートの爆裂メカニズムに関する理論的検討"日本火災学会平成13年度春季研究発表会. (発表予定). (2001)

    • Related Report
      2000 Annual Research Report

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

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