Urban crises - floods, pandemics, economic shocks, and conflicts - function as accelerators of urban change, exposing structural vulnerabilities while creating windows for reinvention. Building on a prior theoretical contribution that identified fifteen principles of urban antifragility, this paper tests and operationalizes the framework through an empirical assessment of 26 cities selected for their post-crisis adaptation trajectories. Using a tailored diagnostic methodology, we benchmark cities' Stress Response Strategies (SRS) and then evaluate Urban Development Trajectories (UDT) across four weighted dimensions, positioning each case along a fragility-robustness-resilience-antifragility continuum and applying a balanced-threshold rule to confirm antifragile status. Results show that "resilience enhanced by innovation and technology" is the most effective response typology (86.9/100), and that six cities meet the antifragile trajectory criteria. By mapping best practices to activated principles and analysing co-activations, the study identifies a robust "hard core" of principles - Sustainable Resilience (O), Strategic Diversity (F), Proactive Innovation (I), and Active Prevention (N) - supplemented by operational enablers (e.g., anticipation, mobilization, shock absorption). The paper concludes by proposing an evidence-based, SDG-aligned operational model that links high-impact principle pairings to measurable indicators, offering a practical roadmap for cities seeking to convert crises into sustained transformation. Keywords: Post-crisis strategies, Urban antifragility, Sustainable cities and communities, Disaster resilience and urban regeneration, Risk governance and Black Swan adaptation.

翻译：城市危机——洪水、疫情、经济冲击与冲突——作为城市变革的加速器，既暴露结构性脆弱点，亦创造重塑机遇。本文基于先前识别城市反脆弱性十五项原则的理论研究，通过对26个因危机后适应轨迹而入选的城市进行实证评估，对该框架进行检验与操作化。采用定制化诊断方法，我们首先对标各城市的应激响应策略，继而通过四个加权维度评估城市发展轨迹，将每个案例定位于脆弱性-鲁棒性-韧性-反脆弱性连续谱，并应用平衡阈值规则确认反脆弱状态。结果显示，“由创新与技术增强的韧性”为最有效的响应类型（86.9/100），且六个城市满足反脆弱轨迹标准。通过将最佳实践映射至激活原则并分析协同激活模式，本研究识别出一个坚实的核心原则群——可持续韧性（O）、战略多样性（F）、前瞻性创新（I）与主动预防（N）——辅以操作性赋能要素（如预见能力、动员机制、冲击缓冲）。文末提出一个基于证据且与可持续发展目标对齐的操作模型，将高效原则组合与可量化指标相联结，为寻求将危机转化为持续转型的城市提供实践路线图。关键词：危机后策略，城市反脆弱性，可持续城市与社区，灾害韧性与城市再生，风险治理与黑天鹅适应。