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Damage-dependent vulnerability curves for existing buildings

机译：现有建筑物的与损坏有关的脆弱性曲线

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Seismic behavior of damaged buildings may be expressed as a function of their REsidual Capacity (REC), which is a measure of seismic capacity, reduced by damage. REC can be interpreted as the median value of collapse vulnerability curves. Its variation owing to damage is a useful indication of increased building vulnerability. REC reduction, indicating the lowering of seismic safety after an earthquake (performance loss, PL), represents an effective index for assessing the need of seismic repair/strengthening after earthquakes. The study investigates the applicability of a pushover-based method in the analysis of damaged structures for the case of existing under-designed RC buildings. The paper presents a systematization of the procedure in an assessment framework that applies the capacity spectrum method based on inelastic demand spectra; furthermore, the vulnerability variation of a real building is investigated with a detailed case study. The behavior of damaged buildings is simulated with pushover analysis through suitable modification of plastic hinges (in terms of stiffness, strength and residual drift) for damaged elements. The modification of plastic hinges has been calibrated in tests on nonconforming columns. The case study analysis evidenced that, for minor or moderate damages, the original structural displacement capacity was only slightly influenced, but the ductility capacity was significantly reduced (up to 40%) because of the increased structure deformability. This implied performance loss in the range 10%-20%. For severe damages the PL ranged between 41% and 56%. Local mechanism types exhibit PL nearly double with respect to global mechanism types.
机译：受损建筑物的抗震性能可表示为其残余承载力（REC）的函数，它是抗震能力的量度，可通过破坏减少。 REC可解释为崩溃脆弱性曲线的中值。由于损坏而造成的变化是建筑物易损性增加的有用指示。 REC减少表示地震后地震安全性下降（性能损失，PL），是评估地震后地震修复/加固需求的有效指标。这项研究调查了基于推覆法的方法在分析现存设计不足的RC建筑物中受损结构时的适用性。本文介绍了在评估框架中对程序进行系统化的过程，该框架应用了基于非弹性需求谱的能力谱方法。此外，通过详细的案例研究来研究真实建筑物的脆弱性变化。通过对塑性铰链（在刚度，强度和残余漂移方面）进行适当修改，可以通过推覆分析来模拟受损建筑物的行为。塑料铰链的修改已在不合格柱的测试中进行了校准。案例研究分析表明，对于较小或中等程度的破坏，原始结构的位移能力仅受到了轻微影响，但由于增加了结构变形能力，延性能力却显着降低（最高40％）。这意味着性能损失在10％-20％的范围内。对于严重损坏，PL介于41％和56％之间。相对于全局机制类型，本地机制类型表现出PL几乎翻倍。

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