高温后横向压力对带肋钢筋与高强混凝土间粘结的影响

Effect of transverse pressure on bond between ribbed bars and HSC after elevated temperatures

摘要:

配制了C100高强混凝土，分别浇筑了混凝土立方体抗压试块和特制的粘结损伤试块。对立方体试块和粘结试件进行了200℃、300℃、400℃、500℃、600℃的高温试验，测量了不同温度经历高强混凝土的残余抗压强度和基于损伤的粘结强度，并分析了横向压力与粘结强度的关系。对高温后高强混凝土的表观特征和带肋钢筋与高强混凝土粘结强度的退化机理进行了系统和细致的研究，为火灾后高强混凝土结构鉴定及加固维修提供技术支持和理论依据。

Abstract:

Cube specimens and special bond damage specimens were designed and cast with C100 high-strength concrete (HSC). Residual compressive strength of concrete cubes as well as bond strength based on damage testing were examined after being exposed to 200℃, 300℃, 400℃, 600℃ and 800℃, and the relationship between transverse pressure and bond strength was analyzed. Furthermore, the detailed investigations were carried out on the appearance characteristics of specimens and degradation for mechanism of bond strength, which could provide technical support and theoretical basis for both evaluating or strengthening and repairing the concrete structure after fire.