标准火灾作用后型钢混凝土构件的粘结滑移性能试验研究  

Experimental study on bond-slip behavior of steel reinforced concrete members after standard fire

作　　者：张华军 陶忠[2] 韩林海[3] 王志滨[4] ZHANG Huajun;TAO Zhong;HAN Linhai;WANG Zhibin(Hubei Jianke International Engineering Co.,Ltd.,Wuhan 430070,China;Western Sydney University Centre for Infrastructure Engineering,Penrith NSW 2751,Australia;Department of Civil Engineering,Tsinghua University,Beijing 100084,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]湖北建科国际工程有限公司,武汉430070 [2]西悉尼大学基础工程中心,Penrith NSW 2751 [3]清华大学土木工程系,北京100084 [4]福州大学土木工程学院,福州350108

出　　处：《建筑结构》2022年第6期111-118,110,共9页Building Structure

摘　　要：型钢混凝土构件的粘结滑移性能是型钢与混凝土两种性质完全不同的材料能够共同受力协同工作的基础。高温后型钢混凝土试件粘结性能的研究比较少。为了研究火灾作用后型钢混凝土的粘结滑移性能,进行了8个标准火灾(ISO-834)作用后型钢混凝土试件及3个常温对比试件的推出试验。通过试验考察了混凝土强度等级、混凝土保护层厚度、横向配箍率和受火时间等因素对粘结滑移性能的影响。结果表明:常温工况型钢混凝土的粘结力中,化学胶结力贡献较大;而受火后型钢混凝土的粘结力中,化学胶结力贡献明显减小。受火作用后,各试件刚度和极限荷载大幅降低,但是随着受火时间的增长,极限荷载反而有所增加。常温工况下,混凝土强度等级、混凝土保护层厚度、横向配箍率三个因素与粘结强度呈正比例关系。受火作用后,横向配箍率对极限粘结强度的影响显著,而其他各参数的影响则不明显。The bond-slip behavior of steel reinforced concrete members is fundamental for two materials with completely different properties, steel and concrete, to achieve work together under force. There are few studies on the bond properties of steel reinforced concrete specimens after high temperature. In order to study the bond-slip properties of steel reinforced concrete after fire, the push-out tests of 8 standard steel reinforced concrete specimens after fire(ISO-834) and 3 normal temperature comparison specimens were carried out. The effects of concrete strength grade, concrete protective layer thickness, transverse hoop ratio and fire exposure time on the bond-slip properties were investigated through experiments. The results show that the chemical bonding force contributes more to the bonding force of the steel reinforced concrete under normal temperature conditions, while the chemical bonding force contributes significantly reduced to the bonding force of the steel reinforced concrete after fire. After being exposed to fire, the stiffness and ultimate load of each specimen decreased significantly, but with the increase of fire time, the ultimate load actually increased. Under normal temperature conditions, the three factors of concrete strength grade, concrete protective layer thickness, and transverse hoop ratio are proportional to the bond strength. After being exposed to fire, the transverse hoop ratio has a significant effect on the ultimate bond strength, while the effects of other parameters are not obvious.

关 键 词：标准火灾 型钢混凝土 粘结滑移性能 推出试验 粘结强度 

分 类 号：TU398.7[建筑科学—结构工程]