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Preliminary analysis of a soft-storey mechanism after the 2009 L'Aquila earthquake

机译：2009年拉奎拉地震后软层机制的初步分析

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摘要

Observation of damage caused by the recent Abruzzo earthquake on April 6th 2009 showed how local interaction between infills and RC structures can lead to soft-storey mechanisms and brittle collapses. Results of the present case study are based on observed damage caused by the earthquake in the zone of Pettino. Analytical model based on simulated design procedure was built up and time history analyses were employed to verify the causes of the structural collapse, as highlighted by observed damage. This failure mechanism was investigated taking into consideration all components of the ground motion. Nonlinear behavior of brick masonry infills was taken into account and two parametric hypotheses for infill mechanical properties were considered, given the uncertainties that typically characterize these nonstructural elements. Nonlinear modeling of infills was made by a three-strut macro-model aimed at considering both local and global interaction between RC frame and infills. Seismic input was characterized by the real signal registered during the mainshock near the case-study structure. Different shear capacity models were considered in the assessment. Analytical results seem to confirm with good approximation the likely collapse scenario that damage observation highlighted; the lack of proper detailing in the columns made the local interaction between infills and RC columns and the strong vertical component of the ground motion to be the main causes of the brittle failure.
机译：观察到2009年4月6日最近的阿布鲁佐地震造成的破坏，显示出填充物与RC结构之间的局部相互作用如何导致软层机制和脆性塌陷。本案例研究的结果基于观察到的Pettino地区地震造成的破坏。建立了基于模拟设计程序的分析模型，并进行了时程分析以验证结构倒塌的原因，观察到的破坏突出了这一点。考虑到地面运动的所有组成部分，研究了这种失效机制。考虑到砖砌体填充物的非线性行为，并考虑了通常代表这些非结构元素特征的不确定性，因此考虑了两个关于填充物力学性能的参数假设。填充物的非线性建模是通过三支柱宏模型进行的，该模型旨在考虑RC框架和填充物之间的局部和全局相互作用。地震输入的特征是在主震期间靠近案例研究结构的地方记录了真实信号。评估中考虑了不同的剪切能力模型。分析结果似乎很好地证实了损坏观测突出显示的可能的坍塌情况。柱子缺乏适当的细节，导致填充物和RC柱子之间的局部相互作用以及地震动的强烈垂直分量成为脆性破坏的主要原因。

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