Design optimisation of high-rise buildings equipped with slb devices: a case study
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Abstract
In the last decades, the use of passive energy dissipation systems in civil structures has been widely increased to enhance a higher level of protection against earthquakes. A particular device, that belongs to the family of passive energy dissipation systems, is the Shear Link Bozzo (SLB), which is a steel hysteretic dissipator. This particular device has been implemented in several buildings, for both new and retrofitted reinforced concrete and steel buildings. The use of SLBs increases the stiffness of the structure and provides an additional source of energy dissipation during an earthquake, reducing the damage in both structural elements and non-structural components. This paper describes a real case study, consisting in the design of a 25-storey reinforced concrete building located in Acapulco, Mexico, for which the use of the SLB system has been proposed as an alternative to the bare frame structure. The aim of the study is to compare the two different solutions, highlighting the benefits associated with the application of the SLB devices to the structure. The structural design has been carried out following the Performance-Based Seismic Design (PBSD) approach; for the seismic design of the structure, three different levels of the seismic demand are considered: Service Level Earthquake (SLE), Design Level Earthquake (DE) and Maximum Considered Earthquake (MCE). The verification of the structure at the Service Level Earthquake and Design Level Earthquake is carried out with a Response Spectrum Analysis (RSA), introducing an appropriate seismic reduction factor to account for the energy dissipation. For the Maximum Considered Earthquake, a set of seven ground motions is used to assess the structure through non-linear time history analyses. This study demonstrates that incorporating SLB devices leads to a notable enhancement in the seismic performance of the structure and, additionally, has the potential to yield overall economic savings, as illustrated through the specific case study.