Evaluation of Aseismic Reliability of Actual Boiler Structures and a Study on Design of Seismic Ties Based on Proof Tests Using a Large Scaled Shaking Table

Abstract

This paper deals with the evaluation of aseismic reliability of actual boiler plant structures in conjunction with seismic ties, installed between the boiler and the support structures. Proof tests were conducted with a coupled model using a large-scale shake table which verified that the ties acted as energy-absorbing devices against severe earthquakes. Since recent boiler structures are designed based on dynamic response analysis considering the boiler-structure interaction and the effect of energy dissipation of the ties, it is necessary to verify the accuracy of simulation methods. In view of this, the numerical models of the ties are discussed in post analysis. As a result of the post analysis, it is confirmed that (1) seismic ties of existing boiler plants designed by dynamic analysis provide sufficient durability, and (2) the support structures designed by conventional methods have enough aseismic reliability.

Shaking table test of the shock absorbing performance of a new cable‐damper stopper for coal‐fired thermal power plants

“…Stoppers designed for CFTPPs are not adequate, and experimental researches are even less. Aida et al 24 evaluated the aseismic reliability of actual boiler structures equipped with conventional stoppers, which dissipate energy by material plastic deformations of the stoppers and further conducted proof tests by using a large‐scale shaking table. Some other scholars 25–27 reported a viscous‐damping stopper theoretically, which works in earthquakes with relatively large numbers of cycles compared with the conventional metal stoppers, and found that the viscous‐damping stoppers worked better than the conventional ones in reducing the seismic responses of the CFTPP.…”