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本文研究了瞬时高温对高强砼的强度和荷载变形性能的影响。砼强度从31.1～89兆帕不等,暴露的温度为23～800℃。在暴露于高温之前先对试件预加荷载,借以模拟在真实结构中存在的荷载。当暴露的温度为100～300℃时,高强砼的抗压强度降低了15～20％。当温度为400～800℃时,砼的抗压强度就降低到室温时强度的30％左右。在加热期间的暴露状态中,大约有三分之一预加荷载的试件破坏了。然而其余的试件同未加应力的试件相比,其强度的损失较少。无论砼的强度和预加荷载的条件如何,暴露在高温中的砼之弹性模量也下降了。
This paper studies the effect of transient high temperature on the strength and load deformation performance of high-strength crucibles. The intensities ranged from 31.1 to 89 MPa and the exposure temperature was 23 to 800°C. The specimen is preloaded before exposure to high temperatures to simulate the presence of loads in the real structure. When the exposure temperature is 100 to 300°C, the compressive strength of the high-strength crucible is reduced by 15 to 20%. When the temperature is 400 ~ 800 °C, the compressive strength of the crucible is reduced to about 30% of the strength at room temperature. In the exposed state during heating, approximately one-third of the preloaded specimens were destroyed. However, the remaining specimens have less loss of strength than unstressed specimens. Regardless of the strength of the crucible and the preload conditions, the elastic modulus of the crucible exposed to high temperatures also decreased.