摘要
针对钢-混凝土组合梁桥在结合面处承受反复剪力作用的栓钉连接件极限承载力降低现象进行了试验研究。基于考虑构件初始缺陷影响的断裂力学方法,建立了栓钉连接件疲劳寿命分析模型,并通过试验数据确定了模型参数,提出了栓钉连接件残余抗剪承载力与等幅循环荷载加载次数关系的计算方法,采用此计算方法对不同的影响因素进行了参数分析。研究结果表明:栓钉直径越大,其抗剪承载力退化程度越大;栓钉初始缺陷率大于0.1且剪应力幅值大于100MPa时,其抗剪承载力降低速度很快,在工程设计中须加以控制。
The experimental research was implemented to study the phenomenon of decreased ultimate capacities of stud connectors on the joint surface of steel-concrete composite bridge subjected to repeated shear force.Based on the fracture mechanics method considering the impact of the initial defect of component,the fatigue life analysis model of stud connectors was set up,whilst the model parameters were determined by the test data,and the calculation method was proposed to determine the relationship between the residual shear capacities of stud connectors and loading times of constant amplitude cyclic loading.The parametric analyses were conducted for different influence factors based on the proposed calculation method.The results show that the shear capacity would degrade much more seriously with the increase of the diameter of stud connector,and the shear capacity would degrade quickly when the initial defect rate is over 0.1 and the shear stress amplitude is over 100 MPa,which should be controlled in the engineering design.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2013年第4期88-93,101,共7页
China Journal of Highway and Transport
基金
国家自然科学基金项目(51278119)
江苏省博士后科研计划项目(1202009C)
东南大学博士后重点科研计划项目
关键词
桥梁工程
栓钉连接件
断裂力学
残余抗剪承载力
疲劳累积损伤
bridge engineering
stud connector
fracture mechanics
residual shear capacity
fatigue cumulative damage
