全户内变电站装配式钢框架部分隔震结构体系振动台试验

Shaking Table Test on Indoor Substation Prefabricated Steel Frames with a Partial Isolation System

摘要:

针对既有非隔震全户内变电站中楼面设备加速度超限的问题，提出在楼板与设备之间增设隔震支座的部分隔震改造策略。基于此，设计并开展了全户内变电站装配式钢框架结构的振动台试验，包括基底固定体系（FBS）、基底隔震体系（BIS）以及部分隔震体系（PIS）。其中，根据所采用隔震支座的类型，BIS又分为天然橡胶支座（BIS-LNR）和铅芯橡胶支座（BIS-LR）2种型式。试验结果表明，FBS的最大设备加速度达到1.42g，远超限值0.6g，而BIS-LNR、BIS-LR和PIS分别将设备加速度平均降低了87%、69%和77%。在结构响应方面，BIS的最大层间位移角仅为FBS的38%；PIS与FBS相近，两者最大层间位移角均远小于限值1/50。因此，将既有非隔震全户内变电站改造为PIS，能实现结构与设备响应的双重控制目标。

Abstract:

To address the issue of excessive floor-mounted equipment acceleration in existing non-isolated indoor substations， a partial isolation retrofit strategy was proposed by introducing isolation bearings between the equipment and the floor slab. Based on this concept， a shaking table test was conducted on a prefabricated steel frame structure representative of an indoor substation. Three isolation schemes were considered： a fixed-base system （FBS）， a base isolation system （BIS）， and a partial isolation system （PIS）. BIS was further categorized into BIS-LNR and BIS-LR， corresponding to the use of linear natural rubber （LNR） bearings and lead rubber （LR） bearings， respectively. Experimental results show that the maximum equipment acceleration in FBS reaches 1.42g， significantly exceeding the allowable limit of 0.6g. In contrast， BIS-LNR， BIS-LR， and PIS reduce the average equipment acceleration by 87%， 69%， and 77%， respectively. In terms of structural response， the maximum inter-story drift of BIS is only 38% of that of FBS， while PIS shows a drift similar to FBS. Both remain well below the code-specified limit of 1/50. These results demonstrate that the proposed PIS retrofit strategy can effectively achieve the dual control of structural and equipment responses in existing indoor substations.