高强螺栓抗剪连接滑移数值模型

Investigations on Simplified High-strength Bolt-slip Numerical Model for Shear Connection

摘要:

为了减少计算代价并提高计算结果的收敛性，提出了一种新的高强度螺栓滑移数值模型和确定非线性摩擦单元实常数的计算公式。将所提出的数值模型计算结果与已有通用有限元软件的结果进行了对比以验证所提出的数值模型的可靠性。对比结果表明所提出的高强度螺栓滑移数值模型可以精确捕捉高强度螺栓的滑移现象，用于计算摩擦单元实常数的计算公式可以精确得到高强度螺栓的滑移临界摩擦力。通过滑移模型所得滞回曲线与既有模型计算结果高度吻合且计算时间减少约90%。在此基础上，通过参数化分析对简化滑移数值模型的计算误差进行了系统研究。分析了螺栓预紧力、钢板厚度、螺栓直径以及屈服强度对计算精度的影响。结果表明所提出的简化滑移数值模型收敛性好，计算精度高，大大减小了计算代价。

Abstract:

A bolt-slip model was proposed for the simulation of high-strength bolted connections and the method for determining the real constant of nonlinear spring element was also put forward. The reliability of the proposed bolt-slip model was validated and the results were obtained by the proposed model and the refined FE model. The comparison results indicate that the sliding phenomenon can be well captured and the friction force with enough accuracy can be derived by the proposed bolt-slip model. Time for computing reduces by 90% with the same accuracy. In addition， the parametrical analysis was conducted to explore the computational error in different conditions. The influence of pretightening force， thickness of steel plate， bolt diameter and yield strength on accuracy of the proposed bolt-slip model were investigated. Results show that the proposed model is powerful in terms of the convergence and accuracy.