考虑混凝土软化效应的钢筋与混凝土粘结强度计算模型  

A MODEL OF CALCULATING THE BOND STRENGTH BETWEEN REBARS AND CONCRETE CONSIDERING THE SOFTENING EFFECT OF CONCRETE

作　　者：兰官奇 王毅红[2] 刘乐 刘喜[2] 宋梅梅[1] LAN Guan-qi;WANG Yi-hong;LIU Le;LIU Xi;SONG Mei-mei(Xi'an Shiyou University,School of Mechanical Engineering,Xi’an,Shaanxi 710065,China;Chang'an University,School of Civil Engineering,Xi’an,Shaanxi 710061,China;China United Northwest Institute Co.,Ltd,Xi’an,Shaanxi 710077,China)

机构地区：[1]西安石油大学机械工程学院,陕西西安710065 [2]长安大学建筑工程学院,陕西西安710061 [3]中联西北工程设计研究院有限公司,陕西西安710077

出　　处：《工程力学》2022年第9期234-241,256,共9页Engineering Mechanics

基　　金：陕西省自然科学基础研究计划资助项目(2022JQ-301);西部绿色建筑国家重点实验室开放基金项目(LSKF202217);国家自然科学基金项目(51878054);陕西省自然科学基础研究计划一般项目(青年)(2021JQ-605)。

摘　　要：通过钢筋与混凝土拉式粘结试验,测试了高强度带肋钢筋与不同强度等级混凝土的粘结强度,分析了带肋钢筋与混凝土的粘结受力机理;采用双线性软化本构对开裂区的软化行为进行描述,建立了综合考虑开裂区及未开裂区混凝土影响的粘结强度理论计算模型;研究了开裂区不同径向位移分布对计算结果的影响,并将计算结果与试验结果进行对比,验证了计算模型的有效性。结果表明:模型采用基于等效弹性假设的开裂区径向位移分布时,计算值与试验值最为吻合,但却过高的估计了低强度混凝土试件的粘结强度;为确保有足够的安全储备,建议采用弹性假设作为开裂区混凝土径向位移分布。The bond strength between high-strength rebars and concrete with different strengths was tested by pull-out tests.The bonding mechanism between rebars and concrete was analyzed.The bilinear softening constitutive model was used to describe the softening behavior of concrete in the cracked zone,and the theoretical calculation model of the bond strength considering the influence of concrete in cracked and non-cracking zones were established.The effects of different radial displacement distributions in the cracked zone on the calculation results are studied.The validity of the calculation model was verified by comparing the calculated results with the experimental results.The results show that the computational model has the best accuracy when the radial displacement distribution in the fracture zone is assumed to be equivalently elastic.However,the bond strength of low-strength concrete specimens was overestimated under this assumption.It is suggested that the elastic assumption be used as the radial displacement distribution of concrete in the cracked zone to ensure adequate safety reserves.

关 键 词：钢筋混凝土 粘结锚固 破坏机理 粘结强度 力学模型 计算方法 

分 类 号：TU375[建筑科学—结构工程]