【作者】 罗旭斌；

【导师】 马军；

【作者基本信息】 东南大学 ， 结构工程， 2006， 硕士

【摘要】 钢管结构因其具有轻巧美观,用钢量省等优点,在我国得到了迅速的发展,应用范围也越来越广。铸钢节点在现代大跨钢管结构中表现出了造型美观、可塑性强、受力安全合理等优点,正在逐渐被工程设计人员应用于工程实际中。但由于目前国内尚未形成一套能对铸钢节点设计起到指导作用的比较成熟的规范,对铸钢节点的设计研究主要借助有限元软件的计算分析并结合试验加以验证。首先,本文利用有限元分析软件—ANSYS对南通市体育会展中心工程中使用的铸钢节点进行了有限元分析,对其工作状态作出了评估。通过观察铸钢件内外侧关键部位的应力情况,考察了铸钢节点在最不利设计载荷下的受力状态,并跟踪节点在整个加载阶段的应力变化过程,计算出了节点的极限承载力。在计算分析过程中,本文指出了铸钢节点与钢管连接接口处是整个节点的受力薄弱区域,并通过构造措施对这一区域进行了加强,改善了节点的受力状况,提高了结构连接的安全度。其次,对铸钢节点在若干关键几何参数变化的情况下进行了弹塑性大应变分析,考察了铸钢节点的极限承载力与几何参数之间的关系。分析证明,通过合理的设计,可以使多管相交的铸钢节点破坏形态只是单支管达到屈服强度,发生轴向屈服破坏,避免了一般管节点在各支管轴向拉压力共同作用下过度变形破坏和冲切破坏,提高了结构的安全度,并且充分利用了铸钢材料的强度。最后,本文通过有限元分析与试验结果进行了对比,验证了本文所用有限元方法的可靠性。更多还原

【Abstract】 With the advantages of lightness, beauty and lower steel consumption, steel tubular structures have got a quick development and wide application in China. Cast-steel joints applied to the civil engineering by designers represent many advantages such as beauty, freely design and safety. Because the criterion which can direct the cast-steel joints’designing has not been formed in China presently, researches on cast-steel joints mostly by the aid of finite element analysis software and tests.Firstly, by the aid of finite element analysis software—ANSYS, the writer analyzes the cast-steel joints designed in the center of Exhibition and Sport in Nantong, and makes some evaluations for those working state. According to the stress of the key points on the cast-steel joint, the writer observes its working state under the most disadvantage designing load, and traces the full loading-displacement path, then calculates the joint’s ultimate strength. In the process of analysis, the writer finds the cast-steel joint will form a weak zone at the connection with the steel tubes, strengthens the zone with some conformation measures which can improve the working state and the safety of the joint.Secondly, under the change of various geometric parameters , the writer analyzes the cast-steel joint with the measure of inelastic large stress finite element analysis, and observes the connection of the joint’s ultimate strength with geometric parameters. It is proved that if designed reasonably, the multi-tubular cast-steel joints only yield to axis force with one tube. The fracture forms of crushing and excessive deformation due to the pulling and pressing of the branch tube can be avoided, which can improve the safety of the structures.Finally, by comparing the finite element analysis with the results of tests, the dependability of the finite element analysis which the writer uses is validated.更多还原