【摘要】：偏心支撐框架結構體系是一種適用于高烈度震區(qū)的抗側力結構體系。本文將高強鋼材應用于偏心支撐鋼框架結構體系中，研究了高強鋼組合Y型偏心支撐鋼框架結構在循環(huán)荷載作用下的滯回性能、框架-支撐剪力分配、結構破壞機理等，繼而提出抗震設計的建議。 本文研究對象包括：10層Y型偏心支撐框架結構三個，，鋼材組合分別為，純Q235鋼材、Q460和Q235組合、Q690和Q235組合；18層Ｙ型偏心支撐鋼框架結構兩個，鋼材組合分別為，Q460和Q235組合、Q690和Q235組合。組合鋼材中，耗能梁段的鋼材為Q235，其他構件的鋼材選用高強鋼（Q460或Q690）。純Q235偏心支撐鋼框架結構作為對比試件，驗證高強鋼組合偏心支撐鋼框架結構的性能。本文研究參數(shù)為鋼材的不同強度組合、結構的樓層數(shù)。 在進行結構分析之前，按照我國設計規(guī)范并參考相關文獻，進行計算模型結構的設計。而后進行結構模型的建立，其中耗能梁段采用實體單元，除耗能梁段外的構件均采用梁單元�？紤]到材料非線性以及幾何非線性的影響，材料的強化采用了隨動強化，非線性方程通過Newton-Raphson迭代結合增量法進行求解。為了驗證模型建立、分析方法的正確、合理性，采用該種建模、分析方法模擬參考試驗，并將分析結果與試驗結果進行了對比驗證。 最后，根據有限元分析的結果發(fā)現(xiàn)純普通鋼材的偏心支撐框架結構的耗能性能是優(yōu)于高強鋼組合偏心支撐結構的。這主要是因為按照結構規(guī)范設計的高強鋼組合偏心框架支撐結構的框架剪力承擔率較小，造成結構的多道設防并不能很好的體現(xiàn)。因而，建議在高強鋼組合結構設計時，適當?shù)姆糯蠹袅φ{整系數(shù)。
[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.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU391

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