Mechanical properties of high-strength HTRB600 steel bars under high temperature
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摘要: 為研究600 MPa級高強鋼筋高溫下的力學性能,對HTRB600級熱處理高強鋼筋進行高溫下的拉伸試驗,分別測得其在20,200,300,400,500,600,700及800℃高溫下的彈性模量、比例極限、屈服強度、極限強度及應力-應變曲線.試驗結果表明:HTRB600級高強鋼筋高溫下屈服強度、極限強度、比例極限與彈性模量均隨著溫度的升高而顯著降低.500℃時其高溫下的彈性模量、比例極限、屈服強度與極限強度降低為不足常溫下的50%,800℃時已不足常溫下的10%.高溫下HTRB600級高強鋼筋應力-應變曲線隨溫度的升高逐漸趨于圓滑,當溫度達到200℃時,屈服臺階就已消失.600 MPa級鋼筋高溫下屈服強度和極限強度的降低程度明顯大于其他鋼筋500 MPa以下強度的鋼筋.最后提出了適用于HTRB600級高強鋼筋的高溫下應力-應變曲線簡化計算模型.
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關鍵詞:
- HTRB600高強鋼筋 /
- 高溫下 /
- 力學性能 /
- 簡化計算模型
Abstract: Tensile testing of HTRB600 steel bars under high temperature was conducted to determine the mechanical properties of the steel under high temperature. The elastic modulus, proportional limit, yield strength, ultimate strength, and stress-strain curves of steel bars at 20, 200, 300, 400, 500, 600, 700, and 800℃ were obtained. The experimental results show that the elastic modulus, proportional limit, yield strength, and ultimate strength of the bars obviously decrease with increasing temperature. The yield strength, ultimate strength, proportional limit, and elastic modulus of the steel bars at 500 and 800℃ decrease to less than 50% and 10%, respectively, of those of the sample at room temperature. The stress-strain curve of the steel bars smoothens as the temperature increases, and the yield terrace disappears at 200℃. The degree of decrease in yield strength and ultimate strength of the 600 MPa steel bar is obviously larger than that of the < 500 MPa steel bar. Finally, a simplified calculation method to determine the stress-strain curve of HTRB600 steel bars under high temperature was proposed. -
參考文獻
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