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Fig.9 shows the values obtained in the location of gauge 16, placed on the web of the column. It can be seen that the stresses in the case of un-strengthened model are less than the values obtained in the second case. It results that the web of the column is more stressed, but the values are not very high. Fig.9 Results for gauge 16 4 Conclusion The repair and strengthening of steel structures have become increasingly important in civil engineering tasks. The steel structures are durable, they do deteriorate significantly over time and to extend their service life, they must be repaired. Repair measures enable the deteriorated steel structures once again to sustain the action defined in their original designs. Strengthening allows the designed actions to be increased. Both types of measures should be fully exploared before demolition and/or replacement by new structure. The results for this finite element analysis were very close to the results in laboratory. This is very important to know since, for the future, the need of experimental tests will be smaller, for certain modifications in the features of a steel frame connection.
The finite element analysis shows the deformed shape of the connection and can give a more accurate location of the affected zones. Results show that, although there is a rigidity loop on the column, the stresses do not exceed the yielding point in that area. This doesn’t mean that the connection is well designed since the over-strength coefficient has to be taken into account when a design for seismic action is performed. Another idea resulted from this analysis, is the one that attention should be directed to other effects of the action. Here, although the stresses in the flanges decreased, the stresses in the web of the column increased, for the same acting force. References: [1]X1. P100-1/2006, Cod de proiectare seismica, prevederi de proiectare petru cladiri. [2]X2. P100-3/2008, Cod de proiectare seismic, Prevederi pentru evaluarea seismic a cladirilor existente. [3]X3. Di Sarno L., Elnashai A.S., Seismic Retrofitting of Steel and Composite Building Structures, 2002. [4]X4. Ivan M., Ivan A., Stanciu M. Popa V., The influence of geometric imperfections generated by erection and production errors on the behaviour of steel tower, Proceedings of the 10th International Conference on Metal Structures, Orizonturi Universitare, Timisoara, 2003, pp. 50-56. [5]X5. Eurocode8, Design of structures for earthquake resistance, Part 3: Assessing and retrofitting of buildings.
摘要:介绍并分析了钢框架的连接。采用有限元分析的方法,并在实验室进行实验测试。通过有限元的方法分析特殊变形形状时要注意所显示的应力分布的情况。
关键词:变形形状,加固,应变仪，边界条件，应力分布。
1、介绍
钢结构用在不同的工程领域里，如:屋顶,生产厂房,展厅,电视台塔架、电视台传输装置、管道、桥梁、以及高层建筑。
维护、修理和加强现有的钢结构是工程师们重要的工作方向。许多专家和咨询工程公司关心的是分析和设计、执行维修以及采用一些措施来加强现有的钢结构.
钢结构在世界上被应用于很多领域。这些钢结构的一部分即将靠近寿命终点。流程的恶化是由钢腐蚀,焊接中的缺陷和夹杂物、焊接裂缝、屈曲的部分和当时部位的变形导致的,所以在微观结构中由于不同的原因导致了钢结构的缺陷。
可以通过分析其原因来采取一些应对措施,可通过这些方法或者应对措施去修理钢结构损坏的地方，可以以减少或延缓它们的恶化的过程。
修复措施的目的是重新建立一个结构使之能继续承受力,通过这些修复措施的设计，可以这使得的该结构有足够的安全性和耐久性。修复措施可以有效地延长钢结构的使用寿命。需要修复的方面也可能是由于设计错误、施工和维护,或因意外损坏造成的。源-自/751+文,论`文'网]www.751com.cn