A new energy and damage-based design methodology for reinforced concrete frames with energy dissipators
Herian Leyva,Edén Bojórquez,Juan Bojórquez,Luigi Di Sarno,Alí Rodríguez,Alfredo-Reyes-Salazar,Manuel Barraza,Mario Llanes
Abstract
Currently, seismic design of structures has evolved due to new advanced approaches that consider variables associated with damage, which is particularly beneficial for structures susceptible to cumulative inelastic damage, such as those made of reinforced concrete and braced elements. For example, several energy-based design methodologies (EBDM) have been proposed that aim to achieve safer structures through plastic deformation analysis and seismic energy balance. Therefore, in this paper a new EBDM for dual systems composed of reinforced concrete and buckling restrained braces (RCBRB) is presented, specifically tailored for the Mexico City lake-bed zone. This approach is based on transformation factors between single (SDOF) and multi-degree-of-freedom (MDOF) systems to calculate global demands. These demands are distributed to each inter-story and structural element using proposed distribution equations. Finally, the local design is accomplished by comparing the local energy demands with the hysteretic energy dissipation capacity (CEH) using a set of proposed equations. The new approach is applied to the seismic design of two three-dimensional dual systems of 9- and 12-story buildings. To validate this new EBDM, the results are evaluated through inelastic dynamic time-history analyses, demonstrating the proposed approach's potential to design safe structures in terms of maximum inter-story drift, ductility, energy and damage.
