冻融循环后带栓钉连接件型钢混凝土界面剪力传递性能研究  

Study on force transfer behavior of SRC members with stud shear connectors after freezing and thawing

作　　者：王峥 李俊华[1] 姚志成 WANG Zheng;LI Junhua;YAO Zhicheng(College of Civil and Environment Engineering,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学土木与环境工程学院,浙江宁波315211

出　　处：《混凝土》2021年第12期27-30,35,共5页Concrete

基　　金：国家自然科学基金/面上项目(51978344)。

摘　　要：带栓钉连接件型钢与混凝土的黏结主要通过化学胶着力、界面摩擦力以及机械咬合力共同作用实现,冻融循环作用将削弱界面的黏结性能。通过将静水压理论有机的融入混凝土冻融循环破坏过程,结合混凝土界面力学、黏着摩擦理论,分析冻融循环作用对两者界面黏结性能破坏的作用机理。结果表明:型钢混凝土受冻时界面产生的静水压力是胶着力、摩擦力破坏的主因,混凝土受冻胀裂导致栓钉抗剪承载能力下降,使冻融后两者界面的黏结强度迅速降低。基于常温下带栓钉连接件型钢混凝土推出试件的相关计算,提出了冻融循后带栓钉连接件型钢混凝土推出试件的承载能力计算式,计算式计算成果偏于安全。The bond between steel with stud connectors and concrete mainly includes gumming force,interface friction and mechanical bite force.The bond can be weakened after freezing and thawing.Based on the theory of hydrostatic pressure,bond friction and concrete interface mechanics,the mechanism of bond degradation after freeze-thaw cycling was investigated.The result show that the hydrostatic pressure on the interface between steel with stud connectors and concrete after freezing and thawing damages adhesion and friction,concrete cracking leading to a decrease in the shear capacity of the stud,which is the main reason of bond strength decreasing.According to the bearing capacity of steel concrete with stud connectors at state of nature,the calculation formula about freeze-thawing are put forward.The calculation results by the formula generally agree with the test results to a safe extent.

关 键 词：型钢混凝土 栓钉连接件 剪力传递 承载力 黏结退化机理 

分 类 号：TU528.01[建筑科学—建筑技术科学]