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
张菊 , 赵东拂 , 刘育民 , 符演 , 熊海江
建筑钢结构进展 ›› 2025, Vol. 27 ›› Issue (12) : 70 -78.
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
抗滑移系数是影响摩擦型高强螺栓连接承载力的主要因素之一。为研究火灾后摩擦型高强螺栓连接的剩余承载力,本文设计了由10.9级M20摩擦型高强螺栓和Q355B钢板组成试件的受剪试验,研究了钢板不同表面处理方式、不同加热温度自然冷却后摩擦型高强螺栓的抗滑移系数及其折减系数的变化规律。研究结果表明:钢板表面处理方式会影响摩擦型高强螺栓连接的抗滑移系数,且这种影响会随着加热温度的升高有所增大,加热温度相同时采用喷砂表面处理方式螺栓连接的抗滑移系数比采用金属去毛刺打磨表面处理方式螺栓连接的抗滑移系数更大;当加热温度不超过300 ℃时,高温冷却过程对摩擦型高强螺栓连接的抗滑移系数影响不大,超过300 ℃后,高温冷却过程对螺栓连接的抗滑移系数有显著提高作用,且对采用金属去毛刺打磨表面处理方式螺栓连接的抗滑移系数的提高作用比采用喷砂表面处理方式螺栓连接的抗滑移系数的提高作用大。根据试验结果采用双折线模型对试件的抗滑移系数折减系数进行拟合,给出了采用金属去毛刺打磨和喷砂两种表面处理方式的摩擦型高强螺栓连接抗滑移系数折减系数的计算公式和拟合曲线。
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.
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北京建筑大学研究生创新项目(PG2024029)
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