Abstract
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.
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Acknowledgements
This research is financially supported by the National Natural Science Foundation of China (Grant No. 51878123) and the Fundamental Research Funds for the Central Universities (Grant No. DUT19G208).
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Liu, T., He, Z. & Yang, Y. Damage-Endurance-Based Seismic Performance Assessment for Long-Span Lattice Shells with Prestressed Elements. Int J Steel Struct 21, 969–986 (2021). https://doi.org/10.1007/s13296-021-00484-z
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DOI: https://doi.org/10.1007/s13296-021-00484-z