A chimney’s seismic assessment by a tuned mass damper
A chimney’s seismic assessment by a tuned mass damper
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DOI：
10.1016/j.engstruct.2014.05.020
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发表时间：
2014-11
影响因子：
5.5
通讯作者：
Nicola Longarini;M. Zucca
中科院分区：
文献类型：
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作者：
Nicola Longarini;M. Zucca
本文涉及调谐质量阻尼器（TMD）的设计，以改善位于意大利一个重要的水力发电厂的历史烟囱的地震响应。该烟囱建于20世纪初，总高约50 m，结构全部为砌体结构为了改善结构的地震响应，分别采用两种结构形式的有限元模型（FEM）进行了数值分析：“烟囱”（A型）和“带TMD的烟囱”（B型）。两种结构均采用两种不同的有限元模型：以梁单元为特征的有限元模型1和以实体单元为特征的有限元模型2，在有限元模型中，根据意大利建筑规范，通过进行“时程”分析，采用谱相容的加速度记录来施加当地地震。通过一系列的试验测试，确定了有限元模型中砌体的力学特性（弹性模量和抗压强度），最后，通过优化TMD特性，给出了在底部剪力、压/拉应力和顶部位移方面的抗震改善效果。
The paper concerns a tuned mass dumper (TMD) design to improve the seismic response of an historical chimney located in an important Italian hydraulic plant. The chimney, built at the beginning of XX century, has about 50 m total height and its structure is completely in masonry.To understand the chimney’s dynamic response and evaluate the TMD characteristics (in terms of optimum mass, stiffness and damping values) to improve the seismic response, some numerical analysis are carried out by Finite Elements Models (FEM) represented two configurations, respectively: the “chimney” (Type A) and “chimney with TMD” (Type B). Both of the configurations are investigated by two different kind of FEMs: a FEM-Model 1 characterized by beam elements and a FEM-Model 2 characterized by solid elements.In the FEMs, observing the Italian Buildings Code, the local earthquake has been applied by a spectrum-compatible accelerograms by performing a “time history” analysis. The mechanical characteristics of the masonry (elastic modulus and compressive strength) implemented in the FEMs has been already determined by a set of experimental tests.Finally, optimizing the TMD characteristics, the seismic improvements in terms of base shear, compressive/tensile stresses and top displacements are shown.