带非对称阻尼器的柔性支撑框架主余震作用分析

谷子,樊圆,袁苗苗,卢文胜

振动与冲击 ›› 2023, Vol. 42 ›› Issue (4) : 1-9.

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (4) : 1-9.
论文

带非对称阻尼器的柔性支撑框架主余震作用分析

  • 谷子,樊圆,袁苗苗,卢文胜
作者信息 +

An asymmetrical damper to improve tension-only braced frame performance under mainshock and aftershocks coupling strikes

  • GU Zi,FAN Yuan,YUAN Miaomiao,LU Wensheng
Author information +
文章历史 +

摘要

研究主余震耦合作用下具有非对称弹塑性特征的非对称摩擦阻尼器(asymmetrical friction damper ,AFD)对柔性支撑框架结构的减震作用。传统扁钢柔性支撑(tension-only brace,TOB)存在松弛问题导致柔性支撑结构在主余震耦合作用下性能严重退化。研究表明AFD适用于柔性支撑结构,具有非对称弹塑性特征,静摩擦阶段发挥非线性“自拉紧”效应,提供较大的恢复力;在滑动摩擦阶段提供稳定的附加阻尼。该研究对静摩擦阶段和滑动摩擦阶段分别给出了简化模型,对滑动摩擦阶段给出附加阻尼比计算方法。提出了基于AFD的拉紧保护模式和阻尼耗能模式。对比分析柔性支撑框架结构TOB方案和两种AFD方案的主震和主余震耦合弹塑性时程反应,TOB方案在中震主余震及大震主震下屈服,而在大震主余震分析下松弛导致结构破坏,证实柔性支撑结构在主余震耦合作用下存在较大风险;而两种AFD方案可有效保护结构,拉紧保护模式为结构提供了更高的减震上限,而阻尼耗能模式同样有效防止TOB过度松弛,在主余震作用下提升结构减震性能。

Abstract

An asymmetrical friction damper (AFD) with asymmetrical elastic-plastic feature is studied to improve the tension-only braced frames under mainshock and aftershocks coupling strikes. Traditional tension-only braces (TOBs) have slackness problem which can result in severe structural performance degradation under the coupling of mainshock and aftershocks. Testing and analysis results revealed that the AFD is suitable to apply into tension-only braced frames, with asymmetrical elastic-plastic feature, providing large nonlinear restoring force with “self-tensioning” effect in static friction phase, and stable additional damping after sliding friction phase occurs. Theoretical models of static friction and sliding friction phase as well as the calculation method of additional damping ratio are proposed. Self-tensioning and damping protection modes based on AFD are developed. Comparison between nonlinear time history analysis on tension-only braced frame structures with TOBs and AFDs of two protection modes were conducted. The TOBs yielded under the design basis and rare mainshock, and caused structural failure due to their slackness under the rare mainshock and aftershocks, which verifies the risk of TOBs under mainshock and aftershocks coupling strikes. Two tension-only braced structures with protection modes of AFD can both improve the structure under mainshock and aftershocks coupling strikes, in which self-tensioning mode strengthens aseismic performance and damping protection mode prevents slackness, enhancing damping ability under mainshock and aftershocks.

关键词

非对称阻尼器 / 非对称弹塑性模型 / 柔性支撑 / 主余震耦合 / 非线性动力分析

Key words

asymmetrical damper / asymmetrical elastic-plastic model / tension-only brace / mainshock and aftershocks coupling / Nonlinear dynamic analysis

引用本文

导出引用
谷子,樊圆,袁苗苗,卢文胜. 带非对称阻尼器的柔性支撑框架主余震作用分析[J]. 振动与冲击, 2023, 42(4): 1-9
GU Zi,FAN Yuan,YUAN Miaomiao,LU Wensheng. An asymmetrical damper to improve tension-only braced frame performance under mainshock and aftershocks coupling strikes[J]. Journal of Vibration and Shock, 2023, 42(4): 1-9

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