Thermal stress estimation in relation to spalling of high strength concrete restrained with steel rings at high temperatures

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420459
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Gunma University
• Principal Investigator: Ozawa Mitsuo 群馬大学, 大学院理工学府, 准教授 (80313906)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: コンクリート / リング拘束試験 / 爆裂 / 耐火性

Outline of Final Research Achievements

This paper reports on an experimental study regarding the behavior of restrained High Performance Concrete (HPC) in response to the type of extreme heating associated with fire. The study was intended to support estimation of thermal stress from the strain in a restraining steel ring and vapour pressure in restrained concrete under the conditions of a RABT 30 rapid heating curve. Thermal stress calculation was based on the thin-walled cylinder model theory. A spalling failure model based on a tensile strain failure model was also proposed. The results indicated that such modeling enables estimation of the point at which spalling initiates during heating and the consequent spalling depth.

Free Research Field

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