Abstract
The paper presents a proposed framework to optimize the tuned mass damper (TMD) design, useful for seismic improvement of slender masonry structures. A historical masonry chimney located in northern Italy was considered to illustrate the proposed TMD design procedure and to evaluate the seismic performance of the system. The optimization process was subdivided into two fundamental phases. In the first phase, the main TMD parameters were defined starting from the dynamic behavior of the chimney by finite element modeling (FEM). A series of linear time-history analyses were carried out to point out the structural improvements in terms of top displacement, base shear, and bending moment. In the second phase, masonry’s nonlinear behavior was considered, and a fiber model of the chimney was implemented. Pushover analyses were performed to obtain the capacity curve of the structure and to evaluate the performance of the TMD. The results of the linear and nonlinear analysis reveal the effectiveness of the proposed TMD design procedure for slender masonry structures.
Highlights
Many important historical constructions are built in high seismicity areas and nowadays require interventions to improve their resilience
The results show that the frequencies, characterize theparticipating first and the second mode, obtained from the finite element modeling (FEM), are practically coincident with those evaluated Mass after the Damping dynamic tests performed on the historical masonry chimney
The results show that the frequencies, which characterize the first and the second mode, obtained from the FEM, are practically coincident with those evaluated after the dynamic tests performed on the historical masonry chimney
Summary
Many important historical constructions are built in high seismicity areas and nowadays require interventions to improve their resilience. For these slender constructions, structural improvements are necessary to overcome the dynamic effects caused by wind and/or seismic actions. Construction.InInthe thefollowing, following,the thecriteria criteriatotodesign design slender structure arefor pointed out, slender considering, as an example, the case of a chimney and aaTMD aamasonry are pointed asasan andoptimize optimize for masonry slenderstructure structure are pointedout, out,considering, considering, an part of a historical hydraulic plant. It is possible dynamic behavior of the historical chimney, only the upper slender part is considered. The quote of 26.50 m, the chimney considering the presence of a 10 m height basement, which presents a stiffness significantly has only one skin (the external one) with different thicknesses: 0.51 m from 26.50 m to greater than that of the chimney (Figure 5) For this reason, to define the dynamic behavior.
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