高溫作用後鋼纖維活性粉混凝土殘留強度與變形性能

Residual Strength and Deformation of Steel Fibre Reinforced Reactive Powder Concrete after Elevated Temperature

戴毓修(Yuh-Shiou Tai) ； 潘煌鍟(Huang-Hsing Pan) ； 龔盈年(Ying-Nien Kung)

《中國土木水利工程學刊》 22卷1期 (2010/03) Pp. 43-54

https://doi.org/10.6652/JoCICHE.201003_22(1).0004

摘要

當結構物承受地震或衝擊荷重時，有可能因火災而伴隨高溫。對於承受高溫後的結構物，力學性質會有一定程度的折減，有鑑於此，本研究希望藉由對高溫作用後之活性粉混凝土在擬靜態荷重下的應力－應變行為進行研究。研究的過程主要是針對 ϕ50 × 100 mm 之活性粉混凝土，在常溫及200℃ ~ 800℃高溫加熱後之圓柱試體進行試驗。結果顯示活性粉混凝土在加熱至200℃ ~ 300℃後，抗壓強度會提升，但在300℃之後會隨著溫度增加，抗壓強度也隨之下降；峰值應變在200℃時隨著溫度升高而逐漸增加，尤其在400℃ ~ 500℃間的應變增加的速率最快，而在500℃之後則趨於緩和；彈性模數會隨著溫度上升迅速折減，當溫度超過600℃高溫作用後，折減幅度逐漸趨緩。此外，本研究迴歸出高溫後的力學性能預測公式，研究結果將可提供工程應用與設計之參考。

關鍵字

高溫 ； 活性粉混凝土 ； 應力－應變曲線

並列摘要

When the buildings are under the earthquakes or the impact of a projectile that may induce the fire, high temperature due to the fire will cause a certain decrease of mechanical properties to the building. This research is to investigate the stress-strain relationship of RPC in the quasi-static loading after elevated temperature. The cylinder specimens of RPC with ϕ 50 × 100 mm were examined at the room temperature and after 200℃ ~ 800℃. Results show that the residual compressive strength of RPC after heating 200℃ ~ 300℃ will increase compared with that at room temperature, but, then, decrease dramatically when the temperature was heated after 300℃. The residual peak strains of RPC also first increase up to 400℃ ~ 500℃, and then gradually decrease after 500℃. Meanwhile, the residual Young elastic modulus will reduce when the temperature raise. Through the regression analysis, we also propose the regression formula to predict the mechanical properties of RPC after elevated temperature, and these formulae provide a reference for the industrial applications and design.

並列關鍵字

elevated temperature ； reactive powder concrete ； stress-strain curve