Base isolation of heavy non-structural monolithic objects at the top of a masonry monumental construction
Base isolation of heavy non-structural monolithic objects at the top of a masonry monumental construction
复制标题
砌体纪念性建筑顶部重型非结构整体物体的基础隔离
DOI：
10.1617/s11527-015-0637-z
复制
发表时间：
2015
影响因子：
3.8
通讯作者：
A. Tralli
中科院分区：
文献类型：
--
作者：
A. Chiozzi;M. Simoni;A. Tralli
本文论述了重型非结构性整体物体的抗震保护的相关主题，这些物体通常放置在砖石纪念性建筑的顶部，主要用于装饰目的，如尖塔和重型艺术品。即使在地震事件之后，大部分损失是由于建筑物和其他结构系统的结构性倒塌造成的，但本工作中考虑的这类重型非结构性物体对人类生命和文化遗产都是一种严重的潜在危险。在地震中，这些物体会经历很大的底部加速度，最终可能会因摇晃和倾覆而倒塌。本文以费拉拉（意大利）三拱砖石城门顶部的11个古代大理石装饰尖塔的抗震保护为例进行了研究。特别是，概述了评估这些系统在地震激励作用下安全水平的方法，并提出基础隔震是重型非结构整体物体地震改造的一种非常有前途的技术。通过时程动力分析评估了底层砌体结构对地震作用的动力响应，并评估了尖塔底部地面加速度的放大。此外，尖峰被建模为刚体和基础激励下的摇摆行为进行了讨论。最后，通过非线性动力数值模拟评估所提出的基础隔震系统的有效性。
The present paper deals with the relevant topic of seismic protection of heavy non-structural monolithic objects, which are usually placed at the top of masonry monumental constructions for mainly decorative purposes, like pinnacles and heavy artwork. Even if, after seismic events, most of the losses are due to structural collapse of buildings and other structural systems, heavy non-structural objects of the kind considered in the present work represent a serious potential hazard for both human lives and cultural heritage. During earthquakes, such objects undergo large base accelerations, which may eventually cause their collapse by rocking and overturning. In the present contribution, the seismic protection of eleven ancient marble decorative pinnacles placed at the top of the three-arched masonry city gate in Ferrara (Italy) is illustrated as a case study. In particular, a method for assessing the safety level of these systems under the action of seismic excitations is outlined and base isolation is proposed as a very promising technique for the seismic retrofit of heavy non-structural monolithic objects. The dynamical response to seismic actions of the underlying masonry construction is assessed through time-history dynamic analyses and the amplification of the ground accelerations at the base of the pinnacles is evaluated. Furthermore, the pinnacles are modeled as rigid bodies and their rocking behavior under base excitations is discussed. Finally, the effectiveness of the proposed base isolation system is assessed through non-linear dynamic numerical simulations.
DOI：
10.1098/rspa.2012.0026
发表时间：
2012-08
期刊：
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
影响因子：
--
作者：
E. Dimitrakopoulos;M. DeJong
通讯作者：
E. Dimitrakopoulos;M. DeJong