大跨空间钢结构异形节点受力性能分析

发布时间：2018-03-25 23:20

本文选题：大跨空间　切入点：壳单元　出处：《中国海洋大学》2015年硕士论文

【摘要】：随着经济和社会的高速发展大跨空间结构的发展日新月异,社会对大跨结构的功能和形式提出了更高的要求,为此出现了很多跨度大、杆件类型多和受力复杂的大跨空间结构,相应的结构受力将更加复杂。节点在大跨空间结构中处于受力集中的关键部位,在结构的传递路径中起着至关重要的作用,节点一旦失效,相连杆件的承载能力将受到很大影响,进而导致传递路径的改变,最终因为局部杆件的失效破坏导致结构整体的破坏,造成巨大的经济损失和人员伤亡,所以对大跨空间结构节点的研究具有重要的实际意义。本文以青岛火车北站为实际工程背景,以ABAQUS有限元分析软件为工具,分别对该结构屋盖和支座的关键节点进行了线性和非线性有限元分析。主要结论如下：1、进行了屋盖和拱脚支座节点复杂模型的建立和参数设置。从整体结构中选取了有代表性的三跨拱架结构,在ABAQUS软件中进行了屋盖和拱脚支座等关键节点的建模和参数设置,为类似复杂节点的有限元模型建立提供参考。2、进行了关键节点模型合理性的验证和在设计荷载作用下的安全验证。通过与实验结果的对比分析验证了所建有限元模型及参数设置的合理性,为此类复杂节点的有限元模型的建立提供参考,对屋盖中的二个节点和一个拱脚支座节点进行了设计荷载作用下的有限元分析,验证了关键节点的安全性。3、对结构中的关键节点进行了非线性有限元分析及加劲肋的添加对比分析。通过对关键节点进行有限元分析得到了这三个节点的极限承载力、节点的破坏失效模式及薄弱部位,在屋盖节点和拱脚支座节点的局部部位设置加劲肋并与未设置的情况进行对比,得出了加劲肋在改善节点刚度和提高节点承载力方面的作用。
[Abstract]:With the rapid development of economy and society, the rapid development of long-span spatial structure, the society has put forward higher requirements for the function and form of long-span structure. For this reason, there are many long-span spatial structures with large span, many member types and complex forces. The corresponding structural force will be more complicated. The node is in the key position of the stress concentration in the long-span spatial structure, and plays an important role in the transmission path of the structure. Once the node fails, The bearing capacity of the connecting members will be greatly affected, which will lead to the change of the transfer path. Finally, the failure of the local members will lead to the destruction of the whole structure, resulting in huge economic losses and casualties. Therefore, it is of great practical significance to study the joints of large-span spatial structures. This paper takes the Qingdao Railway North Station as the practical engineering background and the ABAQUS finite element analysis software as the tool. The linear and nonlinear finite element analysis of the key joints of the roof and the support are carried out respectively. The main conclusions are as follows: 1. The complex model and parameter setting of the roof and arch support joints are established and selected from the whole structure. The representative three-span arch structure is taken. The modeling and parameter setting of key nodes such as roof and arch support are carried out in ABAQUS software. This paper provides a reference for the establishment of finite element model similar to complex nodes, and verifies the rationality of the key node model and the safety under the action of design load. The finite element method is verified by comparing with the experimental results. The rationality of model and parameter setting, This paper provides a reference for the establishment of the finite element model of this kind of complex joints. The finite element analysis of two joints and one arch bearing joint in the roof is carried out under the design load. The safety of the key joints is verified. The nonlinear finite element analysis of the key joints in the structure and the comparative analysis of the stiffening ribs are carried out. The ultimate bearing capacity of the three joints is obtained by the finite element analysis of the key joints. The failure modes and weak parts of the joints are subjected to stiffening ribs in the local parts of the roof joints and arch support joints, and compared with the uninstalled ones, and the effects of the stiffening ribs on improving the stiffness and bearing capacity of the joints are obtained.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU391

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