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Damage-Endurance-Based Seismic Performance Assessment for Long-Span Lattice Shells with Prestressed Elements
International Journal of Steel Structures ( IF 1.5 ) Pub Date : 2021-05-03 , DOI: 10.1007/s13296-021-00484-z
Tingting Liu , Zheng He , Yang Yang

To ensure post-earthquake safety and improve the earthquake resistance reserve of the rigid shells, this paper addresses the issues with respect to the residual seismic capacity (RSC) of long-span lattice shells with different prestressed stiffened methods from an earthquake-induced damage-endurance perspective. Prestressed optimization shells that aim at improving the internal plasticity distribution and counteracting the external unfavorable load are selected, i.e., a cable-stiffened lattice shell (CLS) and suspen-dome structure (SDS) are used as the research objects. The dynamic responses and plasticity distribution of these structures are measured to reveal a mechanism for subsequent seismic capacity with different degrees of damage. The investigation indicates that the introduction of the cable-stiffened system can significantly improve the earthquake resistance of a damaged CLS by changing the plasticity concentration and force transmission paths in the shell. Instead, the desirable seismic damage-endurance of the SDS depends more on the earthquake resistance reserve provided by the cable-strut system due to self-centering property, although the proportion of plastic members is much higher than that of single-layer lattice shell (SLS) and CLS under the same damage levels. Furthermore, based on the performance levels and objectives, some key design procedures for damage-endurance improvement using prestressed elements are presented and corresponding design guidance is provided, which is believed to be the beneficial complement for the performance-based seismic design for long-span space lattice structures from the perspective of damage-endurance performance.



中文翻译:

预应力单元大跨度格形壳基于损伤耐久性的抗震性能评估

为确保地震后的安全并提高刚性壳体的抗震能力,本文针对地震引起的破坏,采用不同的预应力加筋方法,解决了大跨度格形壳体的剩余地震承载力(RSC)问题。耐力的角度。选择旨在改善内部塑性分布并抵消外部不利载荷的预应力优化壳,即以缆索加劲格壳(CLS)和悬架穹顶结构(SDS)为研究对象。测量了这些结构的动力响应和可塑性分布,揭示了一种具有不同程度破坏的后续地震能力的机制。研究表明,引入电缆加强系统可以通过改变壳体中的塑性浓度和力传递路径来显着提高受损CLS的抗震性。取而代之的是,尽管塑料构件的比例远高于单层网格壳,但SDS的理想抗震破坏性更多地取决于电缆撑杆系统由于其自定心性能而提供的抗震储备( SLS)和CLS在相同的损坏级别下。此外,根据性能水平和目标,提出了一些使用预应力元件改善损伤耐久性的关键设计程序,并提供了相应的设计指南,

更新日期:2021-05-03
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