连鸣, 苏明周, 李慎. 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[J]. 工程力学, 2017, 34(5): 148-162. DOI: 10.6052/j.issn.1000-4750.2015.12.0964
引用本文: 连鸣, 苏明周, 李慎. 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[J]. 工程力学, 2017, 34(5): 148-162. DOI: 10.6052/j.issn.1000-4750.2015.12.0964
LIAN Ming, SU Ming-zhou, LI Shen. PERFORMANCE-BASED PLASTIC DESIGN METHOD FOR Y-TYPE HIGH STRENGTH STEEL COMPOSITE ECCENTRICALLY BRACED FRAMES[J]. Engineering Mechanics, 2017, 34(5): 148-162. DOI: 10.6052/j.issn.1000-4750.2015.12.0964
Citation: LIAN Ming, SU Ming-zhou, LI Shen. PERFORMANCE-BASED PLASTIC DESIGN METHOD FOR Y-TYPE HIGH STRENGTH STEEL COMPOSITE ECCENTRICALLY BRACED FRAMES[J]. Engineering Mechanics, 2017, 34(5): 148-162. DOI: 10.6052/j.issn.1000-4750.2015.12.0964

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

PERFORMANCE-BASED PLASTIC DESIGN METHOD FOR Y-TYPE HIGH STRENGTH STEEL COMPOSITE ECCENTRICALLY BRACED FRAMES

  • 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: In Y-type high strength steel composite eccentrically braced frames (YEBF), link members use steel with a low yield point while beams and columns use high strength steel. This approach can reduce steel consumption and increase economic efficiency. The traditional design method for EBF is based on elastic theory; the plastic deformation is concentrated in certain stories, resulting in presence of weak layers in the structure. In this paper, a performance-based plastic design (PBPD) method is used to design YEBF with shear link (S-YEBF). Target drift and ideal global failure models are adopted as the key parameters to estimate and control the plastic behavior of the structure, which causes all links to dissipate energy under rare earthquakes. Moreover, the story drifts are uniform along the structural height, and they avoid the presence of a weak layer in the structure. A 1/2-scale model for a multi-story PBPD design of S-YEBF was designed to research the seismic performance using a shake table test. The finite element models of the 10-story PBPD of S-YEBF structures and the traditional design of S-YEBF structure were developed. Nonlinear pushover and dynamic analyses were adopted to study the seismic performance of the structures. The results indicate that the S-YEBF structures designed by PBPD method have good seismic performance, and the structures closely follow an ideal failure model. All links entered the plastic stage to dissipate the energy. The story drifts are distributed uniformly along the structural height. The PBPD structure uses less steel than the traditional design. The PBPD method for S-YEBF can be applied to various practical engineering problems.

     

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