新型方钢管柱内套筒装配连接力学性能

针对方钢管柱内套筒装配式节点存在的问题,提出一种新型方钢管柱内套筒装配连接形式,将柱拼接位置上移至梁柱节点核心区上方,为梁柱节点高强螺栓安装提供了空间,同时保证了节点域的连续性。改变内套筒厚度、内套筒长度、对拉螺栓间距及端板厚度等构造参数建立一系列有限元模型,采用ANSYS非线性计算对该新型连接的滞回性能、耗能能力等进行分析。结果表明:该新型连接具有较好的延性和耗能能力,各构造参数变化对其受力性能产生不同的影响。增大内套筒厚度可以提高节点极限承载力和耗能能力,当内套筒厚度大于柱壁厚度2 mm时,节点力学性能提升较明显;适当增加对拉螺栓间距可以改善节点受力;增大内套筒长度,节点刚度、延性和耗能能力均会下降,因此在满足构造要求的前提下,内套筒长度宜取较小值;适当增加端板厚度,可以改善节点受力性能、延性和耗能性能,但端板过厚则不够经济。研究结论可为该新型方钢管柱内套筒装配连接设计和应用提供基础研究数据。

Mechanical properties analysis of new type prefabricated connection of square steel tube with inner sleeve

In this paper, a new type square steel tube column with inner sleeve fabricated connection is proposed. In the new connection, moving the column splicing up above beam-column node core area can provide space for high-strength bolt installation while keeps the continuity of joint panel zone. A series of finite element models were established by changing the thickness of the inner sleeve, the length of the inner sleeve, the spacing of the bolts, and the thickness of the end plate to analyze the hysteretic behavior, energy dissipation capacity and failure mode using nonlinear finite element method of ANSYS. The results show that the new connection has good ductility and energy dissipation, and different parameter has different effects on its mechanical properties. The provision of the reinforcing plate can improve the stress performance of the column splicing position, and increasing the thickness of the inner sleeve can improve the ultimate bearing capacity and energy consuming capacity. When the larger thickness of the inner sleeve is used, the ultimate bearing capacity and energy dissipation capacity of connection will be improved, especially the inner sleeve larger than the thickness of the column wall by 2 mm will work best. Appropriately increasing the distance between the split bolts can improve the mechanical performance of the connection. While the length of the inner sleeve increase, the initial stiffness, ductility and energy dissipation capacity of the connection reduced, so the length of the inner sleeve should be smaller when the structural requirements are met. While the thickness of end plate increase properly, the mechanical behavior and ductility and energy dissipation capacity of the connection will be improved obviously, but it is not economical when the end plate is too thick. The research conclusions can provide basic research data for design and application of the new type square steel tube with inner sleeve fabricated connection.