A Novel Analysis of the Lateral Bearing Capacity of Chevron-Braced Frames
-
摘要: 对人字支撑架的各种破坏模式对应的抗侧承载力进行了分析。结果表明:1)人字支撑架根据破坏机构不同分为 人字撑-横梁汇交节点竖向剪切屈服的绝对弱剪型,先压撑屈曲后节点剪切屈服的相对弱剪型,拉撑不屈服的弯曲型弱梁和拉撑屈服的弯曲型强梁等四种类型;相应地,有四种不平衡力的计算方式。2)不管横梁是否与柱刚接,不平衡力产生的弯矩都按照简支梁计算。3)弱剪型时,构造应满足梁柱节点域的最小要求,并应按照偏心支撑的加劲肋要求设置横向加劲肋;必要时节点区开口以增加变形能力。4)弯曲型弱梁时,结出了不平衡力应该取用的最小值。Abstract: The lateral bearing capacities corresponding to various failure modes of the chevron-braced frame were analyzed. The findings indicate that: 1) Chevron-braced frames exhibit four failure modes: absolute shear-weakened type with vertical shear yielding at the beam-brace intersection; relative shear-weakened type characterized by buckling of the compression brace preceding joint shear failure; flexural-weakened beam type where the tension brace remains elastic; and flexural-strengthened beam type where the tension brace yields. 2) The bending moment induced by the unbalanced force from the braces should be calculated based on simply-supported beam conditions, regardless of whether the beam-column connection is rigid. 3) For shear-weakened configurations, the joint panel zone must satisfy minimum requirements equivalent to those for beam-column connections and should be stiffened according to eccentrically braced frame (EBF) standards; if necessary, introducing openings in the panel zone can enhance deformation capacity. 4) For flexural-weakened beam cases, a minimum required unbalanced force is specified for design.
-
Key words:
- chevron-braced /
- lateral bearing capacity /
- shear yielding /
- buckling /
- unbalanced force
-
[1] 中华人民共和国住房和城乡建设部. 钢结构设计标准:GB 50017—2017[S]. 北京:中国建筑工业出版社,2018. [2] 童根树. 钢结构与钢-混凝土组合结构设计方法[M]. 北京:中国建筑工业出版社,2022. [3] ASCE. Minimum design loads and associated criteria for buildings and other structures:A SCE 7-2016[S]. Reston,Virginia:ASCE,2016. -
点击查看大图
计量
- 文章访问数: 375
- HTML全文浏览量: 109
- PDF下载量: 2
- 被引次数: 0



登录
注册
下载: