摘要
对高温后C70和C85两种高强混凝土的力学性能进行试验研究，包括不同温度后高强混凝土应力一应变曲线、峰值应力、峰值应变、弹性模量、泊松比等的变化情况。研究表明：随受火温度升高，高强混凝土的强度、弹性模量逐渐下降，峰值应变逐渐增大。通过回归分析，给出了相应的回归公式。随后，与普通混凝土进行了比较，发现在常温至500℃温度范围内，高强混凝土具有明显不同于普通混凝土的特点，快速升温时发生爆裂现象，其抗火性能低于普通混凝土。
The experimental research on the mechanical properties of C70 & C85 high shength concretes (HSCs) after high tempeature was conducted. The mechanical properties include stress - strain curve, peak stress, peak strain, modulus of elasticity, and poisson ratio of HSC after different high temperatures. The results showed that the compressive strength and modulus of elasticity decrease and the peak strain increases with the increase of fire temperature. By regression analysis, regression formulas were given. The result has shown that there are significant diffences between the performance of HSC at elevated temperature and that of ordinary concrete in the range from room temperature to 500℃. There is a higher potential of HSC specimens to fail by explosive spalling when subjected to rapid heating. The fire resistance of HSC is lower than that of the ordinary concerete.
出处
《土木工程学报》
EI
CSCD
北大核心
2000年第2期8-12,34,共6页
China Civil Engineering Journal
基金
国家自然科学基金!59678034
关键词
高温
高强混凝土
爆裂
力学性能
high temperature, high strength concrete, explosive spalling, mechanical property
