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“软钢+橡胶”耗能角支架力学性能试验研究和参数分析
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Experimental Study and Parameter Analysis on Mechanical Properties of “Soft-steel + Rubber” Dissipative Angle Bracket
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    摘要:

    本文提出了一种适用于正交胶合木结构的新型耗能角支架,综合了“软钢屈服”与“橡胶剪切变形”双重耗能优势. 为研究新型耗能角支架的力学性能,对12个试件进行了单调加载和低周往复加载试验,总结了其典型的破坏模式,获得了其初始刚度、延性系数、等效黏滞阻尼比等力学性能;采用Abaqus软件建立了新型耗能角支架的弹塑性有限元模型,并基于验证后的数值模型开展了参数化分析. 结果表明:新型耗能角支架的破坏模式主要包含钢桥屈服断裂、底座局部承压破坏和橡胶脱胶破坏三种,其中钢桥屈服断裂是主要破坏模式;各试件延性系数均大于9.6,等效黏滞阻尼比在9%~26%之间,表现出高延性和良好耗能能力;此外,参数化分析结果表明,耗能角支架的承载力与钢骨架厚度、软钢屈服强度、橡胶剪切模量及是否采用垫板呈正相关,而橡胶高度对耗能角支架承载力的影响较小.

    Abstract:

    This paper introduces an innovative dissipative angle bracket for cross-laminated timber(CLT) structures, which takes advantage of the soft-steel bracket and high-damping rubber to provide superior ductility and energy-dissipating capacity. To investigate the mechanical performance of the innovative dissipative angle bracket, monotonic loading and low-cycle reciprocating loading tests were carried out on twelve specimens. The typical failure modes were summarized, and mechanical properties such as initial stiffness, ductility coefficient, and equivalent viscous damping ratio were obtained. An elastoplastic finite element model of the innovative dissipative angle bracket was established using Abaqus software, and a parametric analysis was conducted based on the validated numerical model. The results indicate that the main failure modes of the innovative dissipative angle bracket include steel bridge yielding fracture, local compressive failure of the base, and rubber deboning, with steel bridge yielding fracture being the primary failure modes. All specimens exhibit ductility coefficients greater than 9.6, and the equivalent viscous damping ratio ranges from 9% to 26%, demonstrating high ductility and good energy dissipation capacity. Furthermore, the parametric analysis results show that the load-bearing capacity of the innovative dissipative angle bracket is positively correlated with the thickness of the steel skeleton, the yield strength of the soft-steel, the shear modulus of the rubber and the adoption of the washer, while the height of the rubber has a negligible effect on the load-bearing capacity of the innovative dissipative angle bracket.

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熊海贝 ,尹昊然 ,孙瑾煜 ,陈佳炜 ?,王毳 .“软钢+橡胶”耗能角支架力学性能试验研究和参数分析[J].湖南大学学报:自然科学版,2025,52(11):52~64

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  • 在线发布日期: 2025-12-09
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