摘要
已有震害资料表明,支柱类设备具有较高的地震易损性。本文中提出使用钢丝绳及液压阻尼器组成的复合减震支座减小T型旁路开关的地震响应。本文首先分别对固定支座、钢丝绳阻尼器支座和复合支座的旁路开关进行有限元分析。随后对带复合减震支座的旁路开关进行了振动台试验,识别设备多阶振型,利用加速度响应及质量分布计算各截面弯矩,使用频响函数推算支座的减震效果。结果表明,液压阻尼器可以在钢丝绳阻尼器的基础上进一步减小设备的应力及位移响应。T型旁路开关基频较低且易受到高阶振型影响,设备支柱绝缘子中上部加速度响应最大,顶部位移最大而根部应力最大。减震支座能将设备的应力和位移响应减小大约50%,且设备的应力响应满足安全系数要求。
Earthquake damage investigations showed that pillar equipment is quite vulnerable to earthquakes. In this study, an assembled isolation compromising wire ropes and viscous dampers is proposed to mitigate seismic responses of T-shape bypass switch(BPS). First, the finite element analysis of BPS with fixed base, wire rope isolation and assembled isolation are carried out. Then the BPS with assembled isolation is tested on a shaking table and various vibration modes are obtained. Bending moments at various sections are derived using acceleration responses and detail mass distribution while the effectiveness of isolation is obtained using the frequency response function. The results show that supplementary viscous dampers can further reduce seismic responses on the basis of wire ropes. T-shape BPS has a low natural frequency and is sensitive to high order modes. The maximum acceleration, displacement and stress occur at middle, top and bottom sections, respectively. The assembled isolation can reduce the stress and displacement of BPS by approximately 50% while the stress safety factor of BPS satisfies the requirement.
引文
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