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Experimental Study on Influence of Stress Levels on Compressive Deformation Performances of Concrete Exposed to Ultralow Temperatures
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摘要: 通过对不同初始预压应力水平的混凝土分别进行-40,-80,-120,-160 ℃超低温作用试验,探讨应力水平对混凝土超低温下受压变形性能的影响。结果表明:不同初始预压应力水平的混凝土的轴向受压变形在各降温区间,随作用的低温降低,且基本上均呈不断地增大趋势,随降温点及其温均点超低温的降低也呈增大趋势。但不同初始预压应力水平的混凝土经历各超低温作用的轴向受压变形变化幅度有所不同。较低和较高初始预压应力水平的混凝土的轴向受压变形始终大于中等初始预压应力水平混凝土。试验结果可为低温储罐类预应力混凝土结构的设计和安全评估提供参考。Abstract: Through experiments of the concrete with different initial preloading stress levels (IPSLS) that experienced different low temperatures (-40 ℃, -80 ℃, -120 ℃ and -160 ℃), the effect of IPSL on the compressive deformation performances of concrete exposed to ultralow temperatures was discussed. The test results showed that the compressive deformation of concrete with different IPSL increased continually with the decrease in temperature during each temperature ranged from room temperature to given ultralow temperature. Similarly, the compressive deformations of concrete at the cooling target point and the temperature uniformity target point showed an increase trend with the decrease in temperature for these temperature ranges. But there existed difference among the changing rates of the compressive deformation for concrete with different IPSL. The compressive deformations of concrete with lower and higher IPSL were larger than that of concrete with a medium IPSL from beginning to end. The results could provide reference to the design and safety evaluation of prestressed concrete structures as LNG storage tanks.
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