ABSTRACT

The paper presents a simplified vulnerability assessment method for unreinforced masonry buildings based on the evaluation of a few structural parameters, which can be determined from visual inspection and a geometry survey. The authors proposed an empirical approach with the aim to assess the in-plane vulnerability quickly by predicting the damage failure of bearing masonry walls. Field observations reveal different behaviours: out-of-plane and in-plane seismic responses. Several simplified assessments focus on out-of-plane behaviour. Few studies deal with in-plane seismic behaviour, which is also the expected response for more masonry buildings. The proposed seismic method provides a vulnerability index, which is evaluated as the weighted sum of 10 parameters markedly affecting the in-plane seismic performance. The reliability of the method is investigated through an application on buildings located in Central Italy, damaged by the 2016 earthquake. The mean damage and damage probability distributions were predicted for each building using the proposed method. Then, fragility functions were estimated from the results of non-linear static analysis, and the damage probability distributions were derived. The capability of the simplified method to foresee the damage probabilities was confirmed by a comparison between different approaches, confirming the reliability of the method in large-scale seismic assessment.

摘要

本文提出了一种简化的无筋砌体建筑脆弱性评估方法，该方法基于对一些结构参数的评估，这些参数可以通过目视检查和几何测量来确定。作者提出了一种经验方法，旨在通过预测承重砌体墙的破坏失效来快速评估平面内的脆弱性。现场观测揭示了不同的行为：平面外和平面内地震响应。一些简化的评估侧重于平面外行为。很少有研究涉及面内地震行为，这也是更多砖石建筑的预期响应。所提出的地震方法提供了一个脆弱性指数，该指数被评估为显着影响面内地震性能的 10 个参数的加权和。该方法的可靠性通过对位于意大利中部的建筑物的应用进行了调查，该建筑物受到 2016 年地震的破坏。使用所提出的方法预测了每个建筑物的平均损坏和损坏概率分布。然后，根据非线性静态分析的结果估计脆弱性函数，并推导出损伤概率分布。通过不同方法之间的比较，证实了简化方法预测损伤概率的能力，证实了该方法在大尺度地震评估中的可靠性。根据非线性静力分析结果估计脆弱性函数，导出损伤概率分布。通过不同方法之间的比较，证实了简化方法预测损伤概率的能力，证实了该方法在大尺度地震评估中的可靠性。根据非线性静力分析结果估计脆弱性函数，导出损伤概率分布。通过不同方法之间的比较，证实了简化方法预测损伤概率的能力，证实了该方法在大尺度地震评估中的可靠性。