高强钢组合Y型偏心支撑框架结构滞回性能分析

发布时间：2018-11-15 14:32

【摘要】：偏心支撑框架结构体系是一种适用于高烈度震区的抗侧力结构体系。本文将高强钢材应用于偏心支撑钢框架结构体系中，研究了高强钢组合Y型偏心支撑钢框架结构在循环荷载作用下的滞回性能、框架-支撑剪力分配、结构破坏机理等，继而提出抗震设计的建议。本文研究对象包括：10层Y型偏心支撑框架结构三个，，钢材组合分别为，纯Q235钢材、Q460和Q235组合、Q690和Q235组合；18层Ｙ型偏心支撑钢框架结构两个，钢材组合分别为，Q460和Q235组合、Q690和Q235组合。组合钢材中，耗能梁段的钢材为Q235，其他构件的钢材选用高强钢（Q460或Q690）。纯Q235偏心支撑钢框架结构作为对比试件，验证高强钢组合偏心支撑钢框架结构的性能。本文研究参数为钢材的不同强度组合、结构的楼层数。在进行结构分析之前，按照我国设计规范并参考相关文献，进行计算模型结构的设计。而后进行结构模型的建立，其中耗能梁段采用实体单元，除耗能梁段外的构件均采用梁单元。考虑到材料非线性以及几何非线性的影响，材料的强化采用了随动强化，非线性方程通过Newton-Raphson迭代结合增量法进行求解。为了验证模型建立、分析方法的正确、合理性，采用该种建模、分析方法模拟参考试验，并将分析结果与试验结果进行了对比验证。最后，根据有限元分析的结果发现纯普通钢材的偏心支撑框架结构的耗能性能是优于高强钢组合偏心支撑结构的。这主要是因为按照结构规范设计的高强钢组合偏心框架支撑结构的框架剪力承担率较小，造成结构的多道设防并不能很好的体现。因而，建议在高强钢组合结构设计时，适当的放大剪力调整系数。
[Abstract]:Eccentrically braced frame structure system is a kind of lateral force resisting structure system suitable for high intensity seismic region. In this paper, high strength steel is applied to eccentrically braced steel frame system. The hysteretic behavior, frame-bracing shear force distribution, structural failure mechanism of high strength steel composite Y-type eccentrically braced steel frame structure under cyclic load are studied. Then some suggestions for seismic design are put forward. The research objects of this paper are as follows: 10 story Y eccentrically braced frame structure three steel combinations are pure Q235 steel Q460 and Q235 Q690 and Q235 respectively; There are two steel frames with 18 layers of Y eccentrically braced steel, which are composed of Q460 and Q235, Q690 and Q235, respectively. In the composite steel, the steel of energy consuming beam section is Q235, and the steel of other members is high strength steel (Q460 or Q690). Pure Q235 eccentrically braced steel frame structure is used as a contrast specimen to verify the performance of high strength steel composite eccentrically braced steel frame structure. The parameters of this paper are the different strength combinations of steel and the number of floors of the structure. Before structural analysis, the computational model structure is designed according to the design code of our country and referring to relevant literature. Then, the structure model is established, in which the energy dissipation beam section uses solid element, and all the components except the energy dissipation beam section use beam element. Considering the influence of material nonlinearity and geometric nonlinearity, the material strengthening is followed up and the nonlinear equation is solved by Newton-Raphson iteration and increment method. In order to verify the establishment of the model and the correctness and reasonableness of the analytical method, this method is used to simulate the reference test, and the analysis results are compared with the experimental results. Finally, according to the results of finite element analysis, it is found that the energy dissipation performance of eccentrically braced frame structure of pure ordinary steel is better than that of composite eccentrically braced structure of high strength steel. This is mainly due to the fact that the shear capacity of high strength steel composite eccentrically braced frame structures designed according to the structural code is small, so that the multi-channel fortification of the structure is not well reflected. Therefore, it is suggested that the appropriate magnification shear adjustment coefficient should be adopted in the design of high strength steel composite structures.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU391

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