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首页> 外文期刊>Engineering failure analysis >Failure analysis of seven masonry churches severely damaged during the 2012 Emilia-Romagna (Italy) earthquake: Non-linear dynamic analyses vs conventional static approaches
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Failure analysis of seven masonry churches severely damaged during the 2012 Emilia-Romagna (Italy) earthquake: Non-linear dynamic analyses vs conventional static approaches

机译：在2012年艾米利亚—罗马涅（意大利）地震中严重受损的七个砌体教堂的失效分析：非线性动态分析与常规静态方法

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This study presents a detailed failure analysis of seven masonry churches, which were severely damaged during the 2012 Emilia-Romagna (Italy) seismic sequence, by means of 3D FE non-linear dynamic simulations. The main aims of the numerical investigations are: (1) to carry out a sufficiently wide sensitivity study on different specific case studies to have an insight into the role played by the geometry - which is always unique for churches - and by the irregularities; (2) to validate or address the limits of applicability of the most widespread conventional static approaches recommended by Italian Code, i.e. kinematic limit and pushover analyses. Non-linear dynamic analyses are carried out assuming that masonry behaves as a non-linear material exhibiting softening and damage, frictional behavior and different strength in tension and compression. The set of case studies investigated in this work shows how conventional static approaches are still capable of roughly identifying the most critical macro-elements that usually activate a failure mechanism, but that the results (e.g. collapse acceleration, behavior factor) are affected by a level of approximation that may considerably depend on in-plan irregularity and hypotheses done on the interlocking between contiguous walls. From the comparative analyses carried out, it is authors' opinion that it is always beneficial to perform different types of analysis in order to have a comprehensive insight into the portions of the structure that can suffer a partial collapse with high probability. Once the active mechanism is identified, non-linear dynamic analyses, with more sophisticated material models and with refined FE discretizations of the critical regions, may be useful to deepen the knowledge of the behavior of such complex structures under seismic actions. (C) 2015 Elsevier Ltd. All rights reserved.
机译：这项研究通过3D FE非线性动态模拟，对在2012年艾米利亚—罗马涅（意大利）地震序列中严重受损的七个砖石教堂进行了详细的失效分析。数值研究的主要目的是：（1）对不同的具体案例进行足够广泛的敏感性研究，以洞悉几何形状（对于教会来说是唯一的）和不规则性所起的作用; （2）验证或解决意大利法典建议的最广泛的常规静态方法的适用性限制，即运动学限制和下推分析。进行非线性动力分析，假设砌体表现为非线性材料，表现出软化和破坏，摩擦行为以及拉伸和压缩强度不同。在这项工作中研究的一组案例研究表明，传统的静态方法仍然能够大致识别通常会激活故障机制的最关键的宏元素，但是结果（例如，崩溃加速，行为因素）会受到一定程度的影响。近似值可能很大程度上取决于平面内的不规则性以及对连续墙之间的互锁进行的假设。从进行的比较分析中，作者认为进行不同类型的分析始终是有益的，以便对结构中可能遭受局部塌陷的部分进行全面了解。一旦确定了主动机制，则非线性动力学分析，更复杂的材料模型以及关键区域的精细有限元离散化，可能有助于加深对此类复杂结构在地震作用下的行为的了解。 （C）2015 Elsevier Ltd.保留所有权利。

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