A framework for estimating immediate interdependent functionality reduction of a steel hospital following a seismic event
A framework for estimating immediate interdependent functionality reduction of a steel hospital following a seismic event
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DOI：
10.1016/j.engstruct.2018.05.009
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发表时间：
2018-08-01
影响因子：
5.5
通讯作者：
Mahmoud, Hussam
中科院分区：
文献类型：
--
作者：
Hassan, Emad M.;Mahmoud, Hussam
基础设施的功能是其提供预期服务的能力。在极端事件发生后，保持可接受的基础设施功能水平，特别是关键基础设施，对于有效的社区恢复至关重要。评估功能取决于对损失的适当量化，这需要准确地评估基础设施损害。损伤以脆性函数的形式表示，通常采用非线性有限元分析。到目前为止，还没有进行研究来评估建模方法对基础设施的地震易损性、相关损失和功能减少的影响。此外，现有的评估极端事件后关键基础设施(如医院)功能的框架没有考虑医院与其他生命线之间的相互依存关系。在这项研究中，提出了一个新的框架，用于评估地震后医院的即时功能。该功能是根据医院因其持续损坏以及对医院所依赖的其他生命线的损坏而造成的损失来估计的。此外，还评估了模型分辨率对计算的易损性、估计的直接损失和相关功能的影响。医院模型从具有理想边界条件的简化二维模型到考虑土-结构相互作用的更全面的三维模型各不相同。分析表明，采用忽略土-结构相互作用的简化二维模型可能会导致非保守结果。相反，使用更精细的3-D模型可以提供对行为的准确估计，从而更好地评估损失和功能。
Functionality of an infrastructure is its ability to provide its intended services. Maintaining an acceptable level of infrastructure functionality, particularly for critical infrastructure, following an extreme event is vital for effective community recovery. Estimating functionality depends on proper quantification of losses, which requires accurate assessment of infrastructure damage. The damage is presented in the form of fragility functions that are generally developed using nonlinear finite element analysis. To date, no study has been conducted to assess the effect of modeling approach on seismic fragilities of an infrastructure, the associated losses, and functionality reduction. In addition, existing frameworks for estimating functionality of critical infrastructure, such as a hospital, following an extreme event have not considered the interdependent relationship between a hospital and other lifelines. In this study, a new framework for evaluating immediate functionality of a hospital following an earthquake is presented. The functionality is estimated based on hospital losses that result from its sustained damage as well as damage to other lifelines on which the hospital relies. In addition, the effects of modeling resolution on the calculated fragilities, the estimated direct losses, and the associated functionality are evaluated. The hospital models vary from simplified 2-D with idealized boundary conditions to more comprehensive 3-D models that account for soil-structure interaction. The analysis show that using simplified 2-D models that ignore soil-structure interaction could lead to non-conservative results. On the contrary, using more refined 3-D models could provide accurate estimation of the behavior, and subsequently better assessment of losses and functionality.