延性钢框架在低周反复荷载作用下损伤退化滞回性能分析

发布时间：2018-07-12 19:20

本文选题：延性节点 + 空间钢框架　；参考：《青岛理工大学》2013年硕士论文

【摘要】：目前，国内外对塑性铰外移的新型梁柱节点及平面钢框架的研究已经取得了一定的成果，，但新型延性节点的性能并不能完全反映出空间钢框架的整体性能。所以本文从空间钢框架结构整体受力情况出发，结合新型延性节点的研究成果，建立新型延性节点空间钢框架模型并模拟在低周反复荷载作用下的破坏机理、滞回性能、退化性能等抗震性能以及关键部位处的损伤性能，这对新型延性节点钢框架的设计及工程应用具有指导意义。按照国内现行规范及美国相关规范设计普通节点空间钢框架（OSF）、对称加腋节点空间钢框架（SHF）、翼缘过渡板加强型节点空间钢框架（FPF）、圆弧扩翼式节点空间钢框架（WFF）、圆弧削弱式节点空间钢框架（RBF），利用ANSYS有限元分析软件，对钢框架模型进行低周反复的位移加载，得到五种节点形式空间钢框架的应力及应变的发展情况，破坏发展过程，滞回性能，对比分析抗震指标和损伤退化指标，评价出各个空间钢框架的抗震性能优劣。研究结果表明：各延性节点空间钢框架均能实现梁端塑性铰外移的目的，破坏发展情况相近，普通节点钢框架（OSF）、对称加腋节点钢框架（SHF）及翼缘过渡板节点钢框架（FPF）柱脚由于受力最大而最先出现大塑性变形，梁端下翼缘均发生平面外屈曲变形，最终因为柱脚及梁端部塑性变形过大，导致框架的整体内力重分布不适于继续变形发展而破坏。圆弧扩翼式节点钢框架（WFF）和圆弧削弱式节点钢框架（RBF）最先在梁上扩翼板末端和削弱最深处出现大塑性变形，其次在柱翼缘出现塑性变形，可以延迟柱脚处塑性发展，最终因柱脚塑性变形大而引起整体空间钢框架的扭转和承载力的降低并导致结构破坏。所有的空间钢框架模型均会发生柱脚处塑性破坏，必须通过构造措施设置加劲肋或用混凝土包裹柱脚以提高柱脚的抗弯能力。相比于普通节点钢框架，延性节点钢框架的滞回性能，延性性能及耗能能力均有不同程度的提高，梁柱翼缘焊缝连接处应力及开裂指数都降低，各钢框架模型在加载后期承载力退化不一，而刚度退化比较一致。本文研究成果对工程设计有一定的指导价值，并为进一步研究新型延性节点空间钢框架的整体抗震性能打下基础。
[Abstract]:At present, some achievements have been made in the research of the new Liang Zhu joints and plane steel frames with plastic hinges, but the performance of the new ductile joints can not completely reflect the overall performance of the spatial steel frames. In this paper, based on the whole stress situation of spatial steel frame structure and combined with the research results of new ductile joints, a new model of spatial steel frame with ductile joints is established and the failure mechanism and hysteretic behavior of the new ductile joints are simulated under low cyclic loading. The seismic performance such as degenerative performance and damage performance at key locations are of guiding significance for the design and engineering application of a new ductile joint steel frame. Design of Common Node Space Steel frame (OSF), Symmetry and axillary Node Space Steel frame (SHF), Flange transition Plate reinforced Joint Steel frame (FPF), Circular Arc expansion Joint Space Steel frame (WFF) according to current domestic Code and relevant US Code The weakened joint spatial steel frame (RBF) is analyzed by ANSYS finite element analysis software. The low cycle displacement loading of steel frame model is carried out, and the development of stress and strain, damage development process, hysteretic performance, seismic index and damage degradation index of steel frame with five joint forms are obtained. The seismic performance of each space steel frame is evaluated. The results show that the steel frames with ductile joints can achieve the external displacement of plastic hinge at the end of the beam, and the damage development is similar. The large plastic deformation of column foot of common joint steel frame (OSF), symmetrical steel frame with axillary joint (SHF) and flange transition plate joint steel frame (FPF) occurs first due to the maximum force, and the lower flange of beam is subjected to out-of-plane buckling deformation. Finally, because the plastic deformation of the column foot and the end of the beam is too large, the internal force redistribution of the frame is not suitable for further deformation and development. WFF and RBF are the first large plastic deformation at the end of the expanded flange on the beam, and then plastic deformation at the flange of the column, which can delay the plastic development at the base of the column. Finally, the torsion and bearing capacity of the whole spatial steel frame are reduced due to the large plastic deformation of the column foot, which leads to the failure of the structure. All spatial steel frame models will have plastic failure at the column foot. Stiffening ribs or enclosing the column foot with concrete must be set through construction measures to improve the flexural capacity of column foot. Compared with the ordinary joint steel frame, the hysteretic performance, ductility and energy dissipation capacity of the ductile joint steel frame are improved to some extent, and the stress and cracking index at the weld joint of Liang Zhu flange are decreased. The load-carrying capacity of each steel frame model is different at the later loading stage, but the stiffness degradation is consistent. The research results in this paper have some guiding value for engineering design and lay a foundation for further study on the overall seismic behavior of a new type of ductile joint spatial steel frame.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU391

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