Development and experimental study of a self-centering variable damping energy dissipation brace
Development and experimental study of a self-centering variable damping energy dissipation brace
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DOI：
10.1016/j.engstruct.2018.01.051
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发表时间：
2018-04
影响因子：
5.5
通讯作者：
Longhe Xu;Xing-Si Xie;Zhongxian Li
中科院分区：
文献类型：
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作者：
Longhe Xu;Xing-Si Xie;Zhongxian Li
提出了一种新型的自定心变阻尼耗能支撑(SC-VDED)，以减小自定心耗能支撑的激振力和激振后的刚度突变。该支架使用组合碟形弹簧来提供自定心能力，并采用磁流变(MR)流体装置的结构设计来实现可变阻尼耗能。给出了SC-VDED支撑的力学特性、设计方程和滞回响应方程。设计并制作了全长1.365 m的支撑试件，在不同频率和幅值的正弦激励下进行了一系列循环试验。结果表明，该支撑具有完全的准旗形滞回响应，激励力小，刚度突变小，耗能大。组合碟形弹簧的预紧力应大于初始阻尼力，并应增加其刚度，以充分发挥支撑的自定心和耗能能力。疲劳和破坏试验结果表明，支撑性能稳定，具有自定心和耗能能力，外管夹松动和严重的应力集中导致支撑失效。
A new self-centering variable damping energy dissipation (SC–VDED) brace is proposed to reduce the activation force and sudden change in stiffness after activation of self-centering energy dissipation braces. The brace uses the combination disc springs to provide self-centering capability and the structural design of a magnetorheological (MR) fluid device to realize variable damping energy dissipation. The mechanics of the SC–VDED brace and the equations governing its design and hysteretic responses are presented. A brace specimen with a total length of 1.365 m was designed and fabricated, and a series of cyclic tests were carried out under the sinusoidal excitation with different frequencies and amplitudes. Results demonstrate that the brace exhibits full quasi-flag-shaped hysteretic responses, a small activation force, few sudden change in stiffness, and large energy dissipation. The pre-pressed force of the combination disc springs should be larger than the initial damping force, and their stiffness should be increased to give full play to the self-centering and energy dissipation capabilities of the brace. Fatigue and destructive test results indicate that the behaviors of the brace are stable enough to provide self-centering and energy dissipation capabilities, and the loose and severe stress concentration of the outer tube clamps cause the brace to fail.