栓钉剪力连接件力学性能分析

Analysis of mechanical properties of stud shear connectors

从栓钉剪力连接件受力机理与破坏模式分析出发,基于弹塑性地基中横向荷载作用下的单桩理论,建立栓钉剪力连接件的挠曲线微分方程。根据栓钉剪力连接件各阶段的受力特点,引入边界条件,对栓钉剪力连接件的挠曲线微分进行了求解分析,提出了栓钉剪力连接件的抗剪承载力、剪切刚度、弹性阶段末端的滑移值等的计算公式,建立了栓钉剪力连接件荷载-滑移的三折线本构模型,该模型具有数学形式简单且物理意义明确等特点。算例分析表明:栓钉剪力连接件抗剪承载力值、剪切刚度值、弹性末端滑移值、极限滑移值计算值分别为85.44kN,64.92 kN/mm、0.64 mm、6.13 mm,计算值与试验值吻合较好;栓钉剪力连接件的三折线荷载-滑移关系曲线与Buttry与Ollgaard拟合的全曲线式荷载-滑移曲线较接近,且与栓钉剪力连接件的试验荷载滑移曲线吻合较好。

Based on the analysis of the stress mechanism and failure mode of stud shear connectors, the differential equation of the deflection line of stud shear connectors is established based on the theory of single pile under lateral load in elastoplastic foundation. According to mechanical characteristics in different stages of the stud shear connectors, the boundary conditions are introduced, the stud shear connectors of flexural differential is analyzed, and the calculation formulas of the shear bearing capacity, shear stiffness and elastic stage at the end of the slip value of the stud shear connectorscalculation formula are put forward.The load-slip tri-fold constitutive model of stud shear connectors is established, which has the characteristics of simple mathematical form and clear physical meaning. The results show that the calculated values of shear capacity, shear stiffness, elastic end slip and ultimate slip of stud shear connectors are 85.44 kN, 64.92 kN/mm, 0.64 mm and 6.13 mm respectively and the calculated values are in good agreement with the experimental values. The three-fold line load-slip relationship curve of stud shear connectors is close to the full-curve load-slip curve fitted by Buttry and Ollgaard, and it is in good agreement with the test load-slip curve of stud shear connectors.