焊钉连接件峰值滑移及剪力滑移本构关系

为了得到组合结构桥梁常用的焊钉连接件剪力-滑移本构关系,进行了35个焊钉连接件抗剪性能模型试验.比较分析了焊钉直径、高度、极限抗拉强度和混凝土抗压强度对焊钉峰值滑移的影响,提出了焊钉峰值滑移计算式及考虑其影响的剪力-滑移本构关系式.研究结果表明,峰值滑移随焊钉直径、高度和极限抗拉强度的增加而增大,随混凝土抗压强度的增加而减小;提出的峰值滑移计算式与fédération internationale du béton(fib)所建议公式相比,考虑因素更全面,与试验结果吻合更好.包含峰值滑移的剪力-滑移本构关系式,能够反映焊钉直径、高度、强度和混凝土抗压强度的影响,可用于考虑焊钉非线性作用的组合结构桥梁计算分析.

Peak Slip and LoadSlip Relationship of Headed Stud Connectors

In order to derive the load-slip constitutive expression of headed stud connectors used widely in composite bridges, thirty-five push-out specimens were prepared and tested. Based on the tests results, the influences of stud diameter, stud height, stud ultimate tensile strength and compressive strength of concrete on the peak slip were investigated, and the expression for calculating the peak slip and the load-slip constitutive expression considering the effect of peak slip were proposed. The results indicates that the peak slip increases with the increase of stud diameter, stud height and ultimate tensile strength but decreases with the increase of compressive strength of concrete. The proposed expression of peak slip considers more influence factors and fit better with the test results compared with the expression specified by the CEB-FIP. The load-slip constitutive expression considering the effect of peak slip is able to consider the influence of stud diameter, stud height, stud ultimate tensile strength and compressive strength and be employed to conduct the non-linear numerical and analytical study of composite bridges.