Abstract To improve the structural seismic performance, structural vibration control technology is widely introduced into building structures. In terms of base isolation, both bidirectional and tridirectional isolation systems are usually used in large-scale domes. However, the difference in the isolation performance between the two systems needs to be evaluated and further understood. In this paper, large-scale single-layer lattice domes with bidirectional and tridirectional isolation systems are investigated and compared under near-field and far-field ground motions. The dynamic demands of isolated structures are quantified, and the isolation effectiveness of different isolation systems is evaluated. The effects of the near-field and far-field ground motions on isolated structures are compared. The seismic performance of isolated structures is analyzed based on incremental dynamic analysis (IDA). In addition, a parametric study is performed to discuss the effect of the damping coefficient of the damper in the tridirectional isolation system on the isolation effectiveness. It is found that from a statistical point of view, both the bidirectional and tridirectional isolation systems are able to reduce the dynamic demands of domes during earthquakes, while the tridirectional isolation system has better suppression effectiveness for dynamic demands; the near-field earthquake ground motions have a more obvious influence on isolated structures than the far-field earthquake ground motions. For the tridirectional isolation system, a larger damping coefficient may not necessarily be able to obtain better isolation effectiveness in structures. This study provides a basis for improving the understanding of the isolation effectiveness of different isolation systems used in large-scale domes.

中文翻译：

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地震期间大型单层格子穹顶双向和三向隔震系统有效性的比较研究

摘要 为了提高结构抗震性能，结构振动控制技术被广泛引入建筑结构中。在底座隔离方面，双向和三向隔离系统通常用于大型圆顶。但是，需要评估和进一步了解两个系统之间隔离性能的差异。在本文中，在近场和远场地震动下，对具有双向和三向隔离系统的大型单层格子穹顶进行了研究和比较。对隔离结构的动态需求进行量化，并评估不同隔离系统的隔离效果。比较了近场和远场地面运动对孤立结构的影响。基于增量动力分析（IDA）分析孤立结构的抗震性能。此外，还进行了参数研究，以讨论三向隔震系统中阻尼器的阻尼系数对隔震效果的影响。统计发现，双向隔震系统和三向隔震系统均能降低地震时穹顶的动力需求，而三向隔震系统对动力需求的抑制效果更好；近场地震地面运动对孤立结构的影响比远场地震地面运动更明显。对于三向隔震系统，较大的阻尼系数不一定能在结构中获得更好的隔震效果。