BRB式消能桁架的滞回性能研究

发布时间：2018-04-18 21:29

本文选题：BRB + 消能桁架　；参考：《山东建筑大学》2017年硕士论文

【摘要】：与实腹式钢梁相比,桁架梁具有用钢量低、轻盈美观等优点,特别适合于大跨度结构,但普通桁架抗震性能较差,腹杆无论是轴压还是压弯,其破坏模式均为整体失稳,属于脆性破坏。如果使得桁架上下弦杆均与竖向构件铰接,端部节间下弦杆采用屈曲约束支撑(BRB),其余杆件和节点与普通桁架相同,就形成了BRB式消能桁架结构。它融合了传统桁架和BRB的优点,是一种高效的大跨度抗震钢结构。本文在借鉴前人已有研究成果的基础上,针对BRB屈服承载力、桁架高度以及跨数这三个参数进行研究。通过ABAQUS有限元软件,采用单向加载的方法得到结构的屈服荷载以及屈服位移,采用循环加载的方法得到结构的滞回曲线,对BRB消能桁架结构的极限位移、极限荷载、能量耗散系数以及破坏模式进行了分析。分析结果表明:(1)在桁架端部节间下弦杆采用屈曲约束支撑(BRB),能够显著改善BRB消能桁架结构的抗震性能的同时,其耗能能力以及安全储备相较于普通桁架结构也具有较大的优势;(2)在BRB先屈服以及设置相同的BRB屈服承载力的情况下,BRB式消能桁架的极限位移随着桁架高度的增加而逐渐减小;极限荷载随着桁架高度的增加而逐渐增大;(3)在BRB先屈服以及设置相同的BRB屈服承载力的情况下,BRB式消能桁架的高度以及跨数对结构的能量耗散系数影响不大;(4)在符合设计要求的情况下,应尽量增加BRB消能段的屈服承载力,能够有效地提高消能桁架结构的承载力;最后,本文依据ABAQUS的分析结果得出了BRB式消能桁架结构的特性,并且针对本文的不足以及对以后的研究给出了一点建议。
[Abstract]:Compared with the solid web steel beam, steel truss beam has advantages of low volume, light appearance, especially suitable for large span truss structure, but the ordinary poor seismic performance, either axial or ventral pole bending, the failure modes are overall instability, is brittle. If the chord and the vertical component of hinged side panels supported by the bottom chord buckling constraint (BRB), the other members and joints and the same as ordinary truss, forming BRB type energy dissipation truss structure. It combines the advantages of traditional truss and BRB, is a highly efficient large span steel structure seismic based on the existing research. The results of previous, according to the BRB yield capacity, truss height and span number of these three parameters were studied. Through the finite element software ABAQUS, using the method of one-way loading structure yield load and yield displacement, using cyclic loading Method to get the hysteretic curve, the limit displacement of truss structure BRB ultimate load, analyzed the energy dissipation coefficient and failure modes. Analysis results show that: (1) in the lower chord truss end internode BRB (BRB), can significantly improve the BRB energy dissipation seismic performance of truss structure at the same time, the energy dissipation capacity and safety compared with the ordinary truss structure also has a larger advantage; (2) BRB in the first set the same yield and BRB yield bearing capacity under the condition of limit displacement of BRB type energy dissipation truss decreases with the increase of the height of truss; ultimate load increases with the height of the truss; (3) BRB in the first set the same yield and BRB yield bearing capacity under the condition of BRB had little effect on the energy dissipation of the truss height and span number on the structure of the energy dissipation coefficient; (4) in accordance with the design requirements The case, should as far as possible to increase the yield capacity of BRB energy dissipation section, can effectively improve the energy dissipation capacity of the truss structure; finally, based on the analysis results that the ABAQUS BRB type energy dissipation characteristics of truss structure, and in view of the shortcoming of this paper and the future research are given some suggestions.

【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.11;TU393.3

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