基于自复位与低损技术的RC框架抗震韧性提升策略与量化评估

QUANTITATIVE ASSESSMENT OF SEISMIC RESILIENCE ENHANCEMENT STRATEGIES FOR RC FRAMES USING SELF-CENTERING AND LOW-DAMAGE TECHNOLOGIES

  • 摘要: 为解决普通钢筋混凝土(RC)框架结构震后残余变形过大及非结构隔墙损伤严重导致的修复难题,提出了一种结合自复位技术与低损隔墙的韧性提升策略。基于性能化评估框架,构建了包含普通/自复位RC框架与普通/低损隔墙的4种交叉组合工况。该研究通过增量动力分析与蒙特卡洛模拟进行计算。研究系统量化了不同技术方案在设防地震和罕遇地震下的经济损失及修复时间。结果表明:对于案例结构,自复位技术凭借其卓越的复位机制,罕遇地震工况下结构的残余位移角远低于0.2%,使拆除概率从普通框架的8.27%降至0.09%,显著规避了震后拆除经济损失。低损隔墙通过柔性连接,有效隔离非结构构件的损伤。在设防地震工况下,结构可修复损失降低约20%,功能恢复时间缩短约25%。两种技术的协同应用形成了分级设防、优势互补的减灾机制,双重优化工况在宽震级范围内的预期损失最低。研究成果揭示了结构与非结构构件在不同地震风险水准下的差异化贡献与协同,为RC框架的精细化韧性设计提供了理论依据。

     

    Abstract: To address the challenges of excessive post-earthquake residual deformations in conventional reinforced concrete (RC) frames and severe damage to nonstructural partition walls, a resilience enhancement strategy combining self-centering technology with low-damage partition walls is proposed. Within a performance-based assessment framework, four configurations are established by cross-combining conventional/self-centering RC frames with conventional/low-damage partition walls. The study employs incremental dynamic analysis coupled with Monte Carlo simulations to systematically quantify the economic loss and repair time of different technical schemes under design-level and rare earthquakes. Results indicate that, for the case study, self-centering frames markedly reduce the residual interstory drifts under rare earthquakes to below 0.2%, lowering the demolition probability from 8.27% (conventional) to 0.09% and substantially mitigating the post-earthquake demolition loss. Low-damage partition walls, through flexible connections, effectively isolate the damage to nonstructural components, reducing the repairable loss by 20% and shortening the functional recovery time by 25% under design-level earthquakes. The combined application of both technologies provides a tiered, complementary disaster-mitigation mechanism, achieving a minimal expected loss across a broad seismic intensity range. These findings elucidate the differentiated contributions and synergy of structural and nonstructural components under various seismic risk levels, offering a theoretical basis for refined RC frame resilience design.

     

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