栓钉连接件、锚固及降温方式对高温喷水后型钢再生混凝土界面剪力传递的影响  

Effect of Stud Shear Connector,Anchorage and Cooling Method on Interfacial Shear Transfer of Steel Reinforced Recycled Aggregate Concrete after High Temperature and Water Spraying

作　　者：陈宗平[1,2] 戴上秦 王成 周济 CHEN Zongping;DAI Shangqin;WANG Cheng;ZHOU Ji(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of the Ministry of Education,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《防灾减灾工程学报》2022年第2期362-371,共10页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51578163);广西重点研发计划项目(2017AB02006);广西八桂学者专项研究项目([2019]79号);广西科技基地与人才专项(桂科AD21075031);中央引导地方科技发展资金项目(桂科ZY21195010)资助。

摘　　要：为研究降温方式、锚固长度、栓钉连接件(焊接栓钉)及其位置对高温喷水后型钢再生混凝土界面剪力传递的影响,设计了12个高温喷水后型钢再生混凝土试件和2个高温后型钢再生混凝土试件进行推出试验。试验过程中观察了型钢再生混凝土试件的推出过程及破坏形态,获取了各试件的荷载滑移曲线及其特征点参数,分析了变化参数对其特征点参数的影响规律。结果表明,高温喷水后带栓钉型钢再生混凝土破坏后会在栓钉所在处产生横向裂缝,其加载端与自由端荷载滑移曲线的差异也很大;高温喷水后型钢再生混凝土的黏结强度和弹性黏结抗剪刚度均随历经最高温度的上升而下降;历经最高温度为400℃时,高温喷水后型钢再生混凝土的黏结强度和弹性黏结抗剪刚度低于高温后型钢再生混凝土,la=250 mm的高温喷水后型钢再生混凝土黏结强度和弹性黏结抗剪刚度也低于la=400 mm的高温喷水后型钢再生混凝土,历经最高温度为600℃时则反之;栓钉连接件对高温喷水后型钢再生混凝土界面剪力传递性能的提高显著,特别是将其设置在型钢腹板处。In order to study the influence of cooling method,anchorage length,stud connector(welding stud)and its position on the interfacial shear transfer of steel reinforced recycled aggregate concrete after high temperature and water spraying,12 steel reinforced recycled aggregate concrete specimens after high temperature and water spraying and 2 steel reinforced recycled aggregate concrete specimens after high temperature were designed for push-out test.During the test,the failure process and failure form of the test specimens were observed,the load-slip curve of each specimen and its characteristic parameters were obtained,and the influence law of changing parameters on its characteristic parameters was analyzed.The results show that after the failure of steel reinforced recycled aggregate concrete with stud subjected to high temperature and water spraying,the transverse cracks will occur near the stud,and the load-slip curves of the loading end and the free end are also quite different.The bonding strength and elastic bond shear stiffness of steel reinforced recycled aggregate concrete suffered high temperature and water spraying decreases with the increase of the peak temperature.When the peak temperature reaches 400℃,the bonding strength and elastic bond shear stiffness of steel reinforced recycled aggregate concrete after high temperature and water spraying is lower than that of steel reinforced recycled aggregate concrete only experienced high temperature,the bonding strength and elastic bond shear stiffness of steel reinforced recycled aggregate concrete with la=250 mm is also lower than that of steel reinforced recycled aggregate concrete with la=400mm after high temperature and water spraying,and vice versa when the peak temperature is 600℃.Stud connector has a great impact on improving the interfacial shear transfer of steel reinforced recycled aggregate concrete went through high temperature and water spraying,especially in the steel web position.

关 键 词：高温喷水 型钢再生混凝土 栓钉连接件 锚固长度 降温方式 界面剪力传递 

分 类 号：TU521.1[建筑科学—建筑技术科学]