吴桢灏, 庄亮东, 黄远. 连梁可更换的Y型偏心支撑组合框架力学性能试验研究[J]. 工程力学, 2024, 41(3): 173-186. DOI: 10.6052/j.issn.1000-4750.2022.04.0354
引用本文: 吴桢灏, 庄亮东, 黄远. 连梁可更换的Y型偏心支撑组合框架力学性能试验研究[J]. 工程力学, 2024, 41(3): 173-186. DOI: 10.6052/j.issn.1000-4750.2022.04.0354
WU Zhen-hao, ZHUANG Liang-dong, HUANG Yuan. EXPERIMENTAL STUDY ON MECHANICAL PROPERTY OF Y-ECCENTRICALLY BRACED COMPOSITE FRAME WITH REPLACEABLE LINK[J]. Engineering Mechanics, 2024, 41(3): 173-186. DOI: 10.6052/j.issn.1000-4750.2022.04.0354
Citation: WU Zhen-hao, ZHUANG Liang-dong, HUANG Yuan. EXPERIMENTAL STUDY ON MECHANICAL PROPERTY OF Y-ECCENTRICALLY BRACED COMPOSITE FRAME WITH REPLACEABLE LINK[J]. Engineering Mechanics, 2024, 41(3): 173-186. DOI: 10.6052/j.issn.1000-4750.2022.04.0354

连梁可更换的Y型偏心支撑组合框架力学性能试验研究

EXPERIMENTAL STUDY ON MECHANICAL PROPERTY OF Y-ECCENTRICALLY BRACED COMPOSITE FRAME WITH REPLACEABLE LINK

  • 摘要: 为研究连梁可更换的Y型偏心支撑组合框架(简称“Y型V-EBCF”)的力学性能,设计制作了一榀Y型V-EBCF试件,其中可更换式连梁由低屈服点钢加工并通过高强螺栓与周边构件相连。对Y型V-ECBF试件和拆卸了连梁后的试件分别进行了拟静力试验,分析了试件的失效模式、荷载-位移曲线和残余位移角,试验结果表明:在连梁失效前,结构具有稳定的滞回性能和良好的耗能能力;当拆卸失效连梁后,结构在组合框架的不平衡内力下恢复至原位,残余变形角为0.002 rad,小于规范限值(0.005 rad)及最大可更换残余位移角限值(0.0023 rad),且余下试件再加载时的滞回曲线依旧饱满稳定,表明Y型V-ECBF体系具有良好的震后恢复能力;采用现行AISC360-16规范相关公式可以准确计算低屈服点钢连梁的承载力,但超强系数建议取3.0以防止周边构件的破坏;Y型V-ECBF体系的刚度和承载力等于偏心支撑中连梁和组合框架的刚度与承载力之和。此外,Y型V-EBCF中的连梁会引起框架梁跨中承担额外的弯矩,导致跨中混凝土板的开裂,该文给出了计算跨中混凝土板裂缝宽度的公式。

     

    Abstract: A Y-eccentric brace composite frame with replaceable link (Y-V-EBCF for short) was designed as test specimen to investigate the mechanical property of Y-V-EBCF in this study. Especially, the replaceable link was made of low-yield point steel and connected to peripheral members through high-strength bolts. The cyclic loading tests of Y-V-EBCF specimen and the specimen removing damaged link were carried out. The failure mode, load-displacement curve, and residual drift were obtained. The results indicate that the structure has a stable property of hysteresis and excellent energy dissipation before the link fails. After removing the damaged link, the structure enables to return to the undeformed initial shape under the unbalanced internal force. The residual drift of specimen (0.002 rad) is much less than that of specification (0.005 rad) and the maximum replaceable residual angle (0.0023 rad), and the load-displacement curve of the residual specimen is still plump. The two facts indicate that Y-V-EBCF has favourable resilience. The current design provision according to ANSI/AISC360-16 can be applied to calculate the strength of shear links made of low-yield point steel accurately, but the over-strength factor should be increased to 3.0 to prevent the failure of peripheral member. The stiffness and strength of Y-V-EBCF can be calculated by the linear superposition of the link part and the composite part. Additionally, the concrete slab of the middle segment of the primary beam is cracked because of the added bending moment imposed by the shear link of Y-V-EBCF, and a formula is proposed to calculate the crack width at the middle of the primary beam.

     

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