李文博a,b,王乾峰a,b,彭 刚a,b,赵 茗a,b,程卓群a,b
李文博,王乾峰,彭刚,等.单侧压对冻融混凝土劈拉损伤特性的影响[J].混凝土与水泥制品,2022(6):21-26.
LI W B,WANG Q F,PENG G,et al.Influence of Unilateral Pressure on the Split Tensile Damage Characteristics of Freeze-thaw Deteriorated Concrete[J].China Concrete and Cement Products,2022(6):21-26.
单侧压对冻融混凝土劈拉损伤特性的影响
李文博a,b,王乾峰a,b,彭 刚a,b,赵 茗a,b,程卓群a,b
李文博,王乾峰,彭刚,等.单侧压对冻融混凝土劈拉损伤特性的影响[J].混凝土与水泥制品,2022(6):21-26.
LI W B,WANG Q F,PENG G,et al.Influence of Unilateral Pressure on the Split Tensile Damage Characteristics of Freeze-thaw Deteriorated Concrete[J].China Concrete and Cement Products,2022(6):21-26.
摘 要:对冻融混凝土进行了不同单侧压下的劈拉试验,分析了冻融循环次数和单侧压对混凝土劈拉性能的影响,并结合声发射技术研究了混凝土在劈拉过程中的损伤发展,建立了混凝土损伤演化方程。结果表明:随着冻融循环次数的增加,混凝土冻融劣化程度加深,峰值应力明显降低;相同冻融循环次数下,单侧压越大,混凝土的峰值应力越大;经历冻融循环后的混凝土损伤发展速度加快,单侧压的存在对混凝土的损伤发展起到延阻作用;考虑冻融循环次数和单侧压作用的混凝土劈拉损伤演化曲线均可分为损伤初始发展阶段、损伤稳定发展阶段和损伤快速发展阶段。
Abstract: The split tensile test of freeze-thaw concrete under different unilateral compression was carried out. The influence of the number of freeze-thaw cycles and unilateral compression on the split tensile performance of concrete was analyzed, and the damage of concrete during the split tensile process was studied by acoustic emission technology. The concrete damage evolution formula was established. The results show that as the number of freeze-thaw cycles increases, the degree of freeze-thaw degradation of concrete deepens, and the peak stress decreases significantly. Under the same number of freeze-thaw cycles, the greater the unilateral pressure, the greater the peak stress of concrete. The development speed of concrete damage after the freeze-thaw cycles is accelerated, and the existence of unilateral pressure has an effect of extending resistance on concrete damage. The split tensile damage evolution curve of concrete considering the number of freeze-thaw cycles and unilateral pressure can be divided into initial damage development stage, stable damage development stage, and rapid damage development stage.
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