建筑钢结构进展2025，Vol.27Issue(12)：70-78,9.DOI:10.13969/j.jzgjgjz.20240703002
火灾后摩擦型高强螺栓连接抗滑移系数变化规律试验研究
Experimental Study on the Variation Law of Anti-slip Coefficient of Friction-Type High-Strength Bolts after Fire
摘要
Abstract
Anti-slip coefficient is one of the main factors affecting the bearing capacity of friction-type high-strength bolted connections.In order to study the residual bearing capacity of such connections after fire,a specimen composed of 10.9 grade M20 friction-type high-strength bolt and Q355B steel plate was designed for shear test,and the change rules of anti-slip coefficient and its reduction factor of the friction-type high-strength bolts were investigated after the natural cooling of the steel plate with different surface treatments and heating temperatures.The results show that the steel plate surface treatment will affect the anti-slip coefficient of friction-type high-strength bolt connection,and this effect will increase with the rise of the heating temperature.Under the same temperature condition,the connection with sandblasted surface treatment exhibits a higher anti-slip coefficient than that with metal deburring grinding surface treatment.When the heating temperature is not more than 300℃,the high temperature natural cooling process has little effect on the anti-slip coefficient.When the temperature is more than 300℃,the high temperature natural cooling process has a significant enhancing effect on the anti-slip coefficient.According to the test results,the reduction factors of the anti-slip coefficient for the specimens were fitted using a bilinear model.Calculation formulas and fitting curves of the reduction factors were proposed for friction-type high-strength bolted connections with both metal deburring grinding and sandblasted surface treatments.关键词
摩擦型高强螺栓/火灾/金属去毛刺打磨/喷砂/抗滑移系数/折减系数Key words
friction-type high-strength bolt/fire/metal deburring and grinding/sandblasting/anti-slip coefficient/reduction factor分类
建筑与水利引用本文复制引用
张菊,赵东拂,刘育民,符演,熊海江..火灾后摩擦型高强螺栓连接抗滑移系数变化规律试验研究[J].建筑钢结构进展,2025,27(12):70-78,9.基金项目
北京建筑大学研究生创新项目(PG2024029) （PG2024029）
