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为解决在近期地震中大型变压器遭受严重破坏的问题,利用复合隔震支座系统对一个变压器–套管体系进行了基础隔震振动台试验研究。首先用叠层橡胶支座和滑移橡胶支座组成的复合隔震支座系统对一个变压器–套管体系进行了基础隔震设计布置,然后开展了该变压器–套管体系在白噪声和汶川地震的卧龙波、清平波和曾家波激励下的振动台试验研究,得到了该体系的动力特性和关键部位的地震响应,并对比分析了该变压器–套管体系采用基础隔震与未隔震的地震响应。试验结果表明:与未隔震体系相比,基础隔震变压器–套管体系的加速度和应变响应减小到其未隔震体系时的1/2以下,同时在一定程度上放大了隔震体系的位移响应,但该体系在幅值为0.4g的地震波作用下的套管顶部相对台面的位移<60 mm。复合隔震支座系统减小了地震动向变压器–套管体系传递,过滤掉了地震波中的高频成分,避免了与变压器–套管体系发生类共振,减小了地震响应。该试验研究验证了采用复合支座系统基础隔震变压器–套管体系的有效性,对于采用复合支座系统基础隔震的变压器可以考虑降低1度抗震设计要求。
In order to solve the problem of serious damage to large transformers in recent earthquakes, a base-isolated shaking table experiment on a transformer-casing system was carried out by using composite isolation bearing system. Firstly, a base-isolated design of a transformer-casing system was made with a composite bearing system consisting of a laminated rubber bearing and a sliding rubber bearing, and then the transformer-casing system was tested under white noise and Wenchuan The dynamic characteristics of the system and the seismic response of the key parts of the system were studied with shaking table tests under the excitation of Wolong wave, Qingping wave and Zeng Jiabo. The comparison between the base-isolated and the unsealed Earthquake response. The experimental results show that compared with the unseparated system, the acceleration and the strain response of the base-isolation transformer-casing system are reduced to less than 1/2 of those of the unsealed system, and to a certain extent, the isolation system However, the displacement of the top of the casing relative to the table under the seismic wave amplitude of 0.4g is less than 60 mm. The composite bearing system reduces the transmission of the earthquakes to the transformer-casing system and filters out the high-frequency components in the seismic waves, avoiding resonance with the transformer-casing system and reducing the seismic response. This experimental study validates the effectiveness of a base-isolated transformer-casing system using a composite bearing system, and a 1 degree reduction in seismic design requirements can be considered for transformers isolated with base-isolated composite bearing systems.