论文部分内容阅读
主要分析了带腹板双角钢顶底角钢的弯矩-转角关系,尤其是在剪力和弯矩共同作用下的初始刚度。采用数个三维有限元模型进行分析,将连接件的几何和力学性能作为参数。模型中,所有的连接构件如梁、柱、焊接角和螺栓的建模都采用八节点单元。所有构件的相互作用,如螺栓滑移、摩擦力等,采用表面接触计算法则进行模拟,为更准确地评估连接性能,在螺栓杆处采取预拉伸模拟其初受力状态。通过将数值模拟的结果与试验结果进行对比发现,它们具有良好的一致性。为评估剪力在这种连接中的作用,通过数个不同量级剪力的模型分析发现,剪力对角钢连接初始刚度的影响呈减弱趋势。因此提出一个公式,根据在无剪力情况下连接件的初始刚度和屈服弯矩,计算在任何可能产生剪力的条件下连接件初始刚度的换算系数。
The paper mainly analyzes the moment-angle relationship of the double-angle top angle steel with web, especially the initial stiffness under the combined action of shear force and bending moment. Several three-dimensional finite element models were used to analyze the geometry and mechanical properties of the connectors as parameters. In the model, all the connection members such as beams, columns, welding angles and bolts are modeled using eight-node units. The interaction of all components, such as bolt slippage, friction and so on, is simulated by the surface contact calculation method. In order to evaluate the connection performance more accurately, pretensioning is adopted at the bolt rod to simulate the initial stress state. By comparing the numerical simulation results with the experimental results, they have good consistency. In order to evaluate the role of shear in this kind of connection, the influence of shear force on the initial stiffness of the angle steel connection is weakened by the analysis of several shear models with different magnitudes. Therefore, a formula is proposed to calculate the conversion factor of the initial stiffness of the connector under any possible shear stress, based on the initial stiffness and yielding moment of the connector in the absence of shear.