摘要
为了实现全寿命周期内钢-混凝土组合梁中栓钉连接件滑移量的精确计算,开展栓钉连接件在任意疲劳循环次数下的荷载-滑移计算模型研究。设计并制作了11个栓钉推出试件进行了静力滑移量试验、疲劳滑移量试验及剩余滑移量试验。通过试验结果分析了栓钉连接件在疲劳及静力作用下全过程的滑移量增长和分布特征。在单调荷载作用下,基于统计数据建立了考虑极限滑移量的指数型栓钉荷载-滑移模型。在此基础上,考虑疲劳损伤对栓钉直径及滑移量折减,同时计入栓钉连接件滑移量的累积增长和其自身承载力退化,建立了在任意次数疲劳荷载作用下,栓钉连接件全过程荷载-滑移计算模型,并通过试验值进行验证。结果表明:栓钉连接件的滑移量可分为疲劳加载过程中的累积滑移量和疲劳加载后的剩余滑移量。在疲劳加载过程中,栓钉累积滑移量呈“快速-缓慢-急速”的三阶段增长。在疲劳加载后栓钉剩余滑移量和总滑移量均随着疲劳循环次数增加而减少,说明栓钉疲劳损伤的增加导致其整体变形性能逐渐变差。所提出的栓钉全过程荷载-滑移计算模型的计算值与试验值吻合良好。
To accurately calculate the slip of stud connectors in steel-concrete composite beams during the life cycle,the load-slip calculation model of stud connections under any number of fatigue cycles was studied.11 push-out specimens of stud connectors were designed and fabricated to perform static slip test,fatigue slip test and residual slip test.The slip growth and distribution characteristics of stud connections during the whole process under fatigue and static load were analyzed by test results.Based on the statistical data in this paper and literature,an exponential stud load-slip model considering the ultimate slip was established under monotonic load.On this basis,considering the reduction of stud diameter and slip due to fatigue damage,and taking into account the cumulative increase in the slip of the stud connector and the degradation of its own bearing capacity,a load-slip calculation model for the whole process of stud connectors under any number of fatigue loads was established and verified by test values.The results show that the slip of stud connections can be divided into cumulative slip during fatigue loading and residual slip after fatigue loading.During fatigue loading,the cumulative slip of the stud increases in three stages of“fast-slow-rapid”.After fatigue loading,the residual slip amount and the total slip amount of the stud decrease with the increase of fatigue cycles,which indicates that the overall deformation performance of the stud deteriorates gradually due to the increase fatigue damage.The calculated values of the proposed full-process load-slip calculation model for studs are quite agreeable to the experimental ones.
作者
汪炳
刘小玲
伊西艳
WANG Bing;LIU Xiaoling;YI Xiyan(School of Civil and Environmental Engineering,Ningbo University,Ningbo 315211,Zhejiang,China;Faculty of Maritime and Transportation,Ningbo University,Ningbo 315211,Zhejiang,China)
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2023年第11期91-98,共8页
Journal of Harbin Institute of Technology
基金
浙江省自然科学基金(LQ19E080006)
国家自然科学基金(51808301)
国家山区公路工程技术研究中心开放基金(GSGZJ-2019-04)。
