ADVANCES IN THE DESIGN OF ENERGY DISSIPATING DEVICES. EXPERIMENTAL AND NUMERICAL CHARACTERIZATION

Ramirez J.; Bozzo G.; Rastellini F.; Gonzalez J.M.; La Torre D.; Almeida A.; Valcarcel E. · World Conference on Earthquake Engineering proceedings (2024)

Resumen

This study presents a numerical constitutive characterization of the behavior of a type of energy-dissipating device, known as Shear Link Bozzo (SLB). The SLBs are predominantly shear-based energy dissipation devices that feature a unique comb-type upper connection. This connection transmits the load to the working plate of the device without transmitting any axial force, allowing the plate to rotate in its plane. A set of experimental tests have been performed for geometries and typologies of the energy dissipation system. These tests follow a standard procedure based on cyclic and monotonic loads in order to characterize each device and determine its mechanical properties. The experiments were carried out in the structures laboratory of the University of Lima, Peru. Tridimensional numerical models are defined including the comb-type connection in order to characterize the devices tested for numerical simulation. The numerical models simulate the entire experimental test, including the loading protocols and the appropriate boundary conditions. Both the working plate and the comb-type connection have been modeled numerically and discretized with hexahedral solid elements and regular prisms. Mesh convergence studies are performed to evaluate the accuracy of the solution. An elastoplastic constitutive model with static and kinematic hardening parameters is employed to capture the mechanical behavior of the device. The numerical and experimental comparison is analyzed showing excellent correlation factors for the results obtained like displacement, forces, dissipated energy, and effective stiffness. The optimal constitutive parameters for the correlation are presented. The numerical characterization here presented provides a powerful computational tool for the structural analysis of buildings and bridges under seismic conditions using the SLB dissipative dissipators.

Instituciones: Universidad de Lima