Y形高强钢组合偏心支撑框架结构基于性能的塑性设计方法研究

发布时间：2018-01-19 00:19

本文关键词： 基于性能的塑性设计偏心支撑框架目标位移整体破坏模式弹塑性变形　出处：《工程力学》2017年05期 　论文类型：期刊论文

【摘要】：Y形高强钢组合偏心支撑框架结构(YEBF)的耗能梁段采用屈服点较低的钢材,框架梁、柱采用高强度钢材,采用高强钢可有效减小构件截面,节约钢材,降低造价。现行设计规范中偏心支撑结构基于弹性理论进行设计,采用内力放大系数的方法保证结构在罕遇地震下耗能梁段进入塑性,其他构件保持弹性,结构的弹塑性变形可能过于集中而出现薄弱层。该文提出了采用基于性能设计方法(PBPD)设计剪切屈服型耗能梁段YEBF结构(S-YEBF),以目标位移和理想的整体破坏模式为作为预测和控制结构弹塑性受力状态的性能目标,保证结构在罕遇地震作用下各层耗能梁段均能参与耗能,使结构层间侧移角分布趋于均匀,避免出现薄弱层。根据PBPD方法设计了多层S-YEBF结构,对其1/2缩尺模型进行了振动台试验以评估其抗震性能。通过非线性静力推覆分析和动力时程分析对比了分别采用PBPD方法和传统设计方法设计的10层S-YEBF结构算例的抗震性能。结果表明:采用PBPD方法设计的S-YEBF结构具有良好的抗震性能,结构呈较为理想的整体破坏模式,在罕遇地震作用下,各层耗能梁段均参与耗能,层间侧移角沿结构高度方向分布较均匀;与传统设计相比,PBPD方法设计的S-YEBF结构层间侧移角分布更均匀,并且可节省一定的钢材;PBPD设计方法可以为S-YEBF结构的工程设计提供参考。
[Abstract]:The energy dissipation beam section of YEBF frame structure with Y-shape high strength steel composite eccentrically braced frame structure adopts steel with lower yield point, high strength steel with frame beam and column, and high strength steel can effectively reduce the section of the member and save steel. In the current design code, eccentrically braced structures are designed on the basis of elastic theory. The method of internal force magnification factor is adopted to ensure that the energy dissipation beam section of the structure enters plasticity under rare earthquake, while other members remain elastic. The elastic-plastic deformation of the structure may be too concentrated and the weak layer may appear. In this paper, a performance-based design method is proposed to design the shear yield energy dissipation beam segment YEBF structure (S-YEBF). Taking the target displacement and the ideal overall failure mode as the performance targets to predict and control the elastic-plastic stress state of the structure, the energy dissipation beam section of each layer can participate in the energy dissipation under the rare earthquake. The lateral angle distribution of the structure layer tends to be uniform, and the weak layer is avoided. According to the PBPD method, the multi-layer S-YEBF structure is designed. The shaking table test of its 1/2 scale model was carried out to evaluate its seismic performance. Through nonlinear static push-over analysis and dynamic time-history analysis, 10 stories designed by PBPD method and traditional design method were compared respectively. Seismic behavior of S-YEBF structure example. The results show that:. The S-YEBF structure designed by PBPD method has good seismic performance. Under the action of rare earthquake, the energy dissipation beam section of each layer takes part in energy dissipation, and the lateral angle between layers distributes evenly along the height direction of the structure. Compared with the traditional design, the S-YEBF structure designed by PBPD has more uniform lateral angle distribution, and can save a certain amount of steel. PBPD design method can provide reference for the engineering design of S-YEBF structure.
【作者单位】：西安建筑科技大学土木工程学院;西安建筑科技大学材料科学与工程博士后流动站;西安理工大学土木建筑工程学院;
【基金】：国家自然科学基金项目(51178382)
【分类号】：TU391
【正文快照】： 偏心支撑框架结构兼有中心支撑结构的刚度及框架结构的延性,利用耗能梁段的塑性变形耗散地震能量,是一种优良的抗震结构体系[1 4]。高强钢组合偏心支撑框架结构的耗能梁段采用屈服点低且延性较好的钢材(如Q235钢、Q345钢),框架梁、柱采用高强钢(如Q460钢)。在大震作用下,耗能

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