Numerical Study on Flexural Behavior of Bolted Ball-cylinder Joint

DOI：

 作者 单位 郭小农1，曾强1，黄泽韡1，彭礼2，陈宇1 （1. 同济大学 土木工程学院，上海 200092；2. 上海泰大建筑科技有限公司，上海200092）

为研究螺栓球柱节点的受弯性能，基于2个单向受弯节点试验，采用ABAQUS建立了螺栓球柱节点的有限元模型，得到了节点的破坏模式、螺栓内力及荷载-位移曲线. 通过对比发现，数值分析结果与试验结果吻合良好，验证了数值模型的可靠性. 随后对螺栓球柱节点的数值模型进行了合理简化，并分析了正、负弯矩作用下节点的受力特性. 建立了46个数值模型，对影响螺栓球柱节点受弯性能的因素进行了详细的参数分析. 结果表明，增大圆柱筒壁直径及壁厚可显著提高节点的受弯性能；节点的抗弯刚度及承载力随杆件宽度、弧形垫片厚度、螺栓尺寸及间距的增加而提高，且节点受正弯矩时提高更为明显；设置加劲肋可显著提高节点受弯性能.

In order to investigate flexural behaviors of the bolted ball-cylinder（BBC） joint，based on 2 tests on joints under one-way bending moment，finite element （FE） model was developed in ABAQUS. Failure modes，bolt internal forces as well as the load-displacement curves of the joints were obtained. By comparison，it was found that the numerical results agreed well with the experimental results，verifying the reliability of the FE model. Subsequently，joint model under bending moment was simplified and the mechanical behaviors of joint under positive and negative moments were discussed. In the parametric study，46 FE models were established to investigate the effects of different parameters on flexural behaviors of the BBC joint. The results indicate that increasing the diameter and thickness of the hollow cylinder can improve the flexural behavior of the BBC joint significantly; while the bearing capacity and stiffness of the BBC joint increase with the increase of rectangular tube width，washer thickness，size and interval of the bolts，and the effects will be more obvious when positive moment is applied to the joint. Besides，the ribbed stiffness can improve flexural behavior of the BBC joint greatly.