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Seismic pounding mitigation of a modern heritage R/C bell tower

机译：减轻现代遗产遥控钟楼的地震冲击

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摘要

Pounding is one of the greatest sources of seismic vulnerability of pre-normative R/C structures, as they have often been built at poor distance from adjacent buildings. The effects of pounding can be particularly severe in slender modern R/C heritage structures, including civic or bell towers. An emblematic case study falling in this class of structures, i.e. a monumental R/C bell tower constructed in the early 1960s to replace the former 19th century tower of the Chiesa del Sacro Cuore in Florence, is analyzed in this paper. In order to assess the effects of pounding, a non-linear dynamic finite element enquiry was carried out by simulating collisions with a multi-link viscoelastic contact model originally implemented in this study. The survey results show that pounding affects the seismic response of the bell tower and the church as early as an input seismic action scaled at the amplitude of the normative basic design earthquake level. A retrofit hypothesis to prevent pounding is then proposed, which consists in linking the two structures by means of a pair of fluid-viscous dampers. The technical implementation of this rehabilitation strategy and the benefits induced in the response of the bell tower are discussed in detail in the paper.
机译：撞击是规范前的R / C结构地震易损性的最大来源之一，因为它们通常是在距相邻建筑物不远的地方建造的。在细长的现代R / C遗产结构（包括市政塔或钟楼）中，撞击的影响尤其严重。本文分析了此类结构中的一个标志性案例研究，即1960年代初建造的巨大的R / C钟楼，以取代佛罗伦萨的Chiesa del Sacro Cuore的19世纪前塔。为了评估冲击的影响，通过使用本研究中最初实现的多链粘弹性接触模型模拟碰撞，进行了非线性动态有限元查询。调查结果表明，撞击在钟楼和教堂的地震响应中就早于按标准基本设计地震水平的幅度定标的输入地震作用。然后提出了一种防止撞击的改进假设，该假设包括通过一对流体阻尼器将两个结构连接起来。本文详细讨论了此修复策略的技术实施以及在钟楼响应中产生的收益。

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