高温后混凝土静动态力学性能试验研究
发布时间：2019-07-30 14:28
【摘要】：用高温加热系统对C30、C50两种强度等级混凝土在不同温度条件下进行均匀加热,经自然冷却后用Φ75mm SHPB(Split-Hopkinson Press Bar)实验装置、超声波测量技术及试验压力机对高温前后混凝土试件进行动态冲击与静态抗压试验。结果表明,随温度升高纵波波速、弹性模量及静态抗压强度均出现不同程度减小,总体趋势一致;损伤随温度升高不断增大,在温度400℃、700℃处为明显变化转折点;经不同高温冷却后,混凝土动态破坏强度不断降低、峰值应变不断增大、应力-应变曲线趋平缓,出现塑性流动现象且随温度升高愈加明显。
[Abstract]:The concrete of C30 and C50 strength grades was uniformly heated under different temperature conditions by a high-temperature heating system. After natural cooling, 桅75mm SHPB(Split HopkinsonPressBar)test device was used. The results showed that the longitudinal wave velocity, elastic modulus and static compressive strength decreased to different degrees with the increase of temperature. The damage increases with the increase of temperature, which is a significant change turning point at 400鈩，
本文编号：2520949
[Abstract]:The concrete of C30 and C50 strength grades was uniformly heated under different temperature conditions by a high-temperature heating system. After natural cooling, 桅75mm SHPB(Split HopkinsonPressBar)test device was used. The results showed that the longitudinal wave velocity, elastic modulus and static compressive strength decreased to different degrees with the increase of temperature. The damage increases with the increase of temperature, which is a significant change turning point at 400鈩，
本文编号：2520949
本文链接：https://www.wllwen.com/kejilunwen/sgjslw/2520949.html
