钢框架梁柱节点域腹板滞回性能研究
发布时间：2018-09-10 07:16
【摘要】：钢结构凭借其自重轻、布置灵活、抗震性能好等优点,在工程中得到了广泛的应用。近些年地震灾害频频发生,造成了巨大经济损失和人员伤亡。钢结构的抗震性能研究变得愈来愈重要。而钢框架梁柱节点是结构抗震的薄弱环节,在地震作用下,节点域腹板往往由于过早屈服破坏退出工作,导致节点破坏乃至整个结构的坍塌。本文依托有限元软件Ansys Workbench,采用双线性随动强化模型,服从Von-Mises屈服准则,选择合理的加载制度分别对刚性节点和半刚性节点进行单向加载和循环加载,分析展示节点域腹板的受力情况、螺栓群的等效应力云图、刚性节点的连接角钢以及半刚性节点的连接端板的受力、节点处梁截面的等效应力云图,以及各试件的滞回曲线。从而模拟分析出布置斜肋以及不同的斜肋添加方式对以上两种节点形式抗震性能的影响,提出指导实际工程中节点抗震设计的合理措施。在建模过程中,建立多处接触对模拟螺帽下表面与连接板、连接板与柱翼缘外侧、螺杆与孔壁多处摩擦,其中焊缝用绑定接触模拟,并考虑螺栓预紧拉力存在,网格划分采用手动划分网格的方式,对连接角钢、连接端板以及螺栓群进行局部加密,柱底全面固结,柱顶端施加竖直向下的集中荷载,梁远端施加竖直向下的位移荷载。最终分别得到单向荷载作用下,斜肋的布置方式对刚性节点和半刚性节点的节点域腹板、连接板以及螺栓的影响;循环荷载下,刚性节点和半刚性节点域腹板的等效应力和RN(刚性节点)系列和HRN(半刚性节点)系列试件的滞回曲线。并分析对比有限元计算结果,得到相应的结论:无论是单向加载还是循环加载,斜肋的布置对刚性节点性能有很好的改善,对于刚性节点,在抗震设计建议使用双边交叉布置一字斜肋(RN3)的节点形式;斜肋的布置,对于半刚性节点,在单向荷载作用下可以有效减小节点域腹板的等效应力,但是会给连接板及螺栓造成不利影响,在循环往复荷载下的滞回曲线与不布置斜肋的试件相差不大,其滞回性能没有很大程度的提高,在抗震设计中应根据实际情况酌情使用。
[Abstract]:Steel structure has been widely used in engineering because of its light weight, flexible arrangement and good seismic performance. Earthquake disasters have occurred frequently in recent years, resulting in huge economic losses and casualties. The study of seismic behavior of steel structures is becoming more and more important. The joint of the steel frame Liang Zhu is the weak link of earthquake resistance. Under the earthquake action, the web in the joint domain often exits from work because of premature yield failure, which leads to the joint failure and even the collapse of the whole structure. In this paper, based on the finite element software Ansys Workbench, a bilinear servo strengthening model is adopted. According to the Von-Mises yield criterion, a reasonable loading system is chosen for unidirectional loading and cyclic loading of rigid and semi-rigid joints, respectively. The equivalent stress cloud diagram of bolt group, the connection angle steel of rigid joint and the connection end plate of semi-rigid joint, the equivalent stress cloud diagram of beam section at the joint, and the hysteresis curve of each specimen are analyzed. The influence of the arrangement of inclined ribs and the different ways of adding oblique ribs on the seismic performance of the above two joint forms is simulated and analyzed, and the reasonable measures to guide the seismic design of joints in practical engineering are put forward. In the modeling process, multiple contact pairs were established to simulate the bottom surface of the nut and the connecting plate, the outer side of the connecting plate and the flange of the column, and the friction between the screw and the hole wall, in which the weld seam was simulated by binding contact, and the pre-tightening tension force of the bolt was considered. The method of manual mesh division is used to encrypt the connecting angle steel, connecting end plate and bolt group. The bottom of the column is fully consolidated, the top of the column is subjected to vertical downward concentrated load, and the distal end of the beam is subjected to vertical downward displacement load. Finally, the influence of the arrangement of oblique ribs on the web, connection plate and bolt of rigid and semi-rigid joints is obtained respectively under unidirectional load. The equivalent stress of the web of rigid and semi-rigid joints and the hysteretic curves of RN (rigid joints) series and HRN (semi-rigid joints) series specimens. By analyzing and comparing the finite element calculation results, the corresponding conclusions are obtained: whether under unidirectional or cyclic loading, the arrangement of oblique ribs improves the performance of rigid joints very well, and for rigid joints, In aseismic design, it is suggested to use the joint form of two-sided cross arrangement with a zigzag rib (RN3), and for semi-rigid joints, the equivalent stress of the web in the joint domain can be reduced effectively under unidirectional load. However, the hysteretic curve under cyclic reciprocating load is not different from that of the specimen without inclined rib, and its hysteretic performance is not greatly improved. Therefore, the hysteretic curve should be used according to the actual situation in seismic design.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU391
本文编号：2233763
[Abstract]:Steel structure has been widely used in engineering because of its light weight, flexible arrangement and good seismic performance. Earthquake disasters have occurred frequently in recent years, resulting in huge economic losses and casualties. The study of seismic behavior of steel structures is becoming more and more important. The joint of the steel frame Liang Zhu is the weak link of earthquake resistance. Under the earthquake action, the web in the joint domain often exits from work because of premature yield failure, which leads to the joint failure and even the collapse of the whole structure. In this paper, based on the finite element software Ansys Workbench, a bilinear servo strengthening model is adopted. According to the Von-Mises yield criterion, a reasonable loading system is chosen for unidirectional loading and cyclic loading of rigid and semi-rigid joints, respectively. The equivalent stress cloud diagram of bolt group, the connection angle steel of rigid joint and the connection end plate of semi-rigid joint, the equivalent stress cloud diagram of beam section at the joint, and the hysteresis curve of each specimen are analyzed. The influence of the arrangement of inclined ribs and the different ways of adding oblique ribs on the seismic performance of the above two joint forms is simulated and analyzed, and the reasonable measures to guide the seismic design of joints in practical engineering are put forward. In the modeling process, multiple contact pairs were established to simulate the bottom surface of the nut and the connecting plate, the outer side of the connecting plate and the flange of the column, and the friction between the screw and the hole wall, in which the weld seam was simulated by binding contact, and the pre-tightening tension force of the bolt was considered. The method of manual mesh division is used to encrypt the connecting angle steel, connecting end plate and bolt group. The bottom of the column is fully consolidated, the top of the column is subjected to vertical downward concentrated load, and the distal end of the beam is subjected to vertical downward displacement load. Finally, the influence of the arrangement of oblique ribs on the web, connection plate and bolt of rigid and semi-rigid joints is obtained respectively under unidirectional load. The equivalent stress of the web of rigid and semi-rigid joints and the hysteretic curves of RN (rigid joints) series and HRN (semi-rigid joints) series specimens. By analyzing and comparing the finite element calculation results, the corresponding conclusions are obtained: whether under unidirectional or cyclic loading, the arrangement of oblique ribs improves the performance of rigid joints very well, and for rigid joints, In aseismic design, it is suggested to use the joint form of two-sided cross arrangement with a zigzag rib (RN3), and for semi-rigid joints, the equivalent stress of the web in the joint domain can be reduced effectively under unidirectional load. However, the hysteretic curve under cyclic reciprocating load is not different from that of the specimen without inclined rib, and its hysteretic performance is not greatly improved. Therefore, the hysteretic curve should be used according to the actual situation in seismic design.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU391
【参考文献】
相关期刊论文 前2条
1 黄旭芒;建筑钢结构发展应用及其用材概述[J];江苏冶金;2003年02期
2 陈宏,李兆凡,石永久,王元清;钢框架梁柱节点恢复力模型的研究[J];工业建筑;2002年06期
相关硕士学位论文 前1条
1 刘高波;节点域斜加劲肋设计计算方法[D];西安建筑科技大学;2005年
，本文编号：2233763
本文链接：https://www.wllwen.com/jingjilunwen/jianzhujingjilunwen/2233763.html
