论文部分内容阅读
通过背板加强的连接,成本较低且容易施工,其性能与位于拉力区的加劲肋性能一致。目前,在欧洲规范3中,这种加固方式仅用于抵御受力。首先分析了在有限元建模中无钢筋状态下的T型连接,其为弯曲作用下螺栓连接的主要方式。然后,利用多种几何形状的背板对T型连接进行加强,旨在更好地理解背板在性能和机械作用方面对连接件刚度和抗力的贡献。由有限元软件Cast3m开发的三维模型考虑到了材料弹塑性、大位移和连接件的单侧接触问题。该模型可以很好地反映试验结果。对考虑了背板厚度和预拉力等多种参数的T型连接进行的敏感性分析显示背板在很多工况下对刚度尤其是预加载螺栓的贡献很重要。基于整体荷载-位移曲线、螺栓荷载的发展和撬力作用产生的接触压力对T型连接的性能进行了分析。分析表明T型连接的抗力会随着背板厚度的增加而显著提高,根据分析模型,T型连接承受较低荷载时,其破坏模式会发生改变,此增量由此也会有一个上限值。
The lower cost and easy construction with reinforced connections through the back panel provides the same performance as stiffeners in the tension zone. Currently, in the European Regulation 3, this reinforcement is only used to resist stress. First of all, we analyze the T-shape connection without reinforcement in the finite element modeling, which is the main way of the bolt connection under the bending action. T-joints are then reinforced with a variety of geometrically shaped backplanes in order to better understand the contribution of the backsheet to the stiffness and resistance of the connectors in terms of performance and mechanical action. The 3D model developed by the finite element software Cast3m takes into account the material's elasto-plasticity, large displacements and unilateral contact problems of the connectors. The model can well reflect the test results. Sensitivity analysis of T-joints that take into account a variety of parameters such as backsheet thickness and pre-tension shows that backplanes are important in many conditions for their contribution to stiffness, particularly preloaded bolts. The performance of T-joints was analyzed based on the overall load-displacement curve, the development of bolt loads, and the contact pressure generated by prying forces. The analysis shows that the resistance of T-joints increases significantly with the thickness of the backplane. According to the analysis model, the failure mode of T-joints changes under low load, so the increment will also have an upper limit value.