Abstract
The concept of seismic robustness is proposed by combining the concept of seismic performance and structural robustness. The existing qualitative, quantitative and evaluation methods of seismic robustness are all direct researched on the whole structure, and the influence mechanism of its internal components on the overall seismic robustness is still unclear. It is very important to establish a clear relationship between component design and structural seismic robustness for the structural design, reinforcement design and final evaluation of structural seismic robustness. Based on this, taking the column as the starting point, a quantitative method for the seismic robustness of RC frame by the seismic robustness index is proposed, which takes into account the resistance vulnerability of column and influence of column on the storey drift ratios (SDRs). In which, the resistance vulnerability is represented by the defined control vulnerability coefficient P maxi , and the influence on the SDRs are represented by the storey drift ratio importance coefficients (SDRCs) λ. The method not only reflects the essential mechanical properties of the column, but also reflects the effects brought about by different SALs. The feasibility of the method is demonstrated by numerical examples of two types of failures (assuming single column and two columns failure), and four optimization design proposals are proposed for it. The analysis shows that λ of the target columns to the floor where the target columns located are obviously greater than those on the remaining floors of the target frame. The seismic robustness index R decreases sharply with the increase of the seismic action level (SAL). R is different compare single column failure with two columns failure under 4 SALs. The most effective way to improve the R of the frame under a certain SAL is to retrofit its control column.
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This work was financially supported by the Natural Science Foundation of China (51978417), the Technology Project Funded by Liaoning Provincial Department of Communications (2021034) and Social Governance Science and Technology Special Project Funded by Shenyang in 2020 (20-206-4-11).
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Sheng, G., Jin, S., Ma, L. et al. A Quantitative Method for Seismic Robustness of RC Frame Considering Resistance Vulnerability of Column and Storey Drift Ratios. KSCE J Civ Eng 28, 231–249 (2024). https://doi.org/10.1007/s12205-023-1124-7
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DOI: https://doi.org/10.1007/s12205-023-1124-7