支座激励下端部带水平减震装置悬索的动力分析

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (24) : 298-307.

论文

张鹏1，王国威2，卢文胜2，周祺1

作者信息 +

Dynamic analysis of the suspended cable with horizontal mitigation devices at one end subject to support excitations

ZHANG Peng1, WANG Guowei2, LU Wensheng2, ZHOU Qi1

Author information +

文章历史 +

摘要

近年来工程中常将索网幕墙直接支承在两相邻结构上，然而地震作用下两相邻结构的相对位移可能会引起索网幕墙破坏，造成安全隐患。针对相邻结构间单向索采光顶，本文提出在悬索端部附加水平减震装置来减小悬索的地震响应。水平减震装置包括弹簧装置和阻尼装置，弹簧装置可以减少悬索的地震输入，而阻尼装置可为结构提供附加阻尼。建立了端部带减震装置悬索的动力模型，推导了频率及模态阻尼比的计算公式，分析了结构的阻尼特性，进行了支座激励下端部带减震装置悬索的动力试验，检验了减震效果。结果表明：悬索动力特征系数b2、刚度系数γk及阻尼系数ν是控制结构振动特性的3个无量纲关键参数，为了给悬索提供足够的附加阻尼，建议在工程上ν取值在0到150之间，γk取值在0到1之间。通过合理的设置减震装置参数，悬索的动索力和动位移可以减小30%以上。b2较小或支座激励远离悬索自振频率时可仅在索端部设置弹簧减震装置，b2较大且支座激励接近悬索自振频率时需设置弹簧阻尼减震装置。

Abstract

In recent years, cable net façades are often used to provide cover between adjacent structures. However, there is safety hazards that the relative displacements of adjacent structures may cause the damage of cable net façade under earthquake. Therefore, for one-way cable daylighting roofs between adjacent structures, additional horizontal mitigation devices comprising springs and dampers at the end of cables were proposed in this paper to reduce seismic responses of the facades. Specifically, the horizontal damping device is composed of the springs which can reduce the seismic energy input to the suspension cable and the dampers which provides additional damping. In this research, a theoretical model of suspended cable with the mitigation device at one end was established. Furthermore, the frequency and damping formulas were derived to analyze the damping properties of the suspended cable. In addition, the mitigation effect was verified by the dynamic response tests of the suspended cable attached with this additional device attached subjected to supported excitations. The results show that the dynamic feature coefficient b2, stiffness coefficient γk and damping coefficient ν are three dimensionless key parameters to control the vibration properties of suspended cables. In practical engineering, it is recommended that ν be set between 0 and 150 and γk be set from 0 and 1 to provide sufficient additional damping for suspended cables. It must be noted that the dynamic cable force and displacement can be reduced by exceed 30% by reasonably setting the parameters of the damping device. For cables with a small b2 and support excitations away from the cable natural frequencies, only springs are sufficient for mitigation, while for cables with a largeb2 and support excitations close to the cable natural frequencies, the end springs and dampers can significantly reduce responses of suspended cables.

导出引用

张鹏1，王国威2，卢文胜2，周祺1. 支座激励下端部带水平减震装置悬索的动力分析[J]. 振动与冲击, 2023, 42(24): 298-307

ZHANG Peng1, WANG Guowei2, LU Wensheng2, ZHOU Qi1. Dynamic analysis of the suspended cable with horizontal mitigation devices at one end subject to support excitations[J]. Journal of Vibration and Shock, 2023, 42(24): 298-307

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