Performance-based seismic design of multistory frame structures equipped with crescent-shaped brace

Abstract

Summary The primary objective of the “performance‐based seismic design” is to provide stipulated seismic performances for building structures. However, a certain degree of design freedom is needed for matching a specific seismic response. This design freedom is not obtainable by the conventional lateral resisting systems because their stiffness and strength are coupled. Here, we put emphasis on the role of the unconventional lateral resisting systems in adding more flexibility to the design. In this paper, we seek to explore the seismic design of moment‐resisting frame structures equipped with an innovative hysteretic device, known as “crescent‐shaped brace.” One conspicuous feature of this device is its distinctive geometrical configuration, which is responsible for the enhanced nonlinear force‐displacement behavior exhibited by the device. A new performance‐based approach for the seismic design of the crescent‐shaped brace is proposed. The performance of the device is evaluated, and its application in multistory shear‐type structures is investigated. Two case studies were established to illustrate the design methodology. The first is a new two‐story RC structure, and the second is an existing three‐story RC structure. Nonlinear time history and pushover analyses are performed to evaluate the behavior of the controlled structures. The analyses show that for each of the two case studies, the acceleration–displacement capacity spectrum conforms to the performance objectives curve. This finding confirms the validity of the proposed design approach and the effectiveness of the new hysteretic device in resisting lateral forces.

Cyclic engagement of hysteretic steel dampers in braced buildings: a parametric investigation

“…Among hysteretic dampers, devices based on the plastic deformation of mild steel are the most popular due to their stability at high levels of deformation, negligible degradation and reliability during repeated cycles, and good resistance to weathering and aging. Different types of steel dampers have been proposed and tested for implementation in structures (Javanmardi et al 2020;Di Cesare et al 2014;2017b;Pampanin et al 2017;Morillas et al 2020;Mohsenian et al 2018), including torsional or flexural beams (Montuori et al 2015), single-axis dampers (Skinner et al 1974) U-strips (Baird et al 2014;Buchanan et al 2007), buckling-restrained braces (BRB) (Watanabe et al 1988;Foti et al 2020), crescent shaped braces (CSBs) (Palermo et al 2014(Palermo et al , 2015(Palermo et al , 2017Kammouh et al 2018), and energy dissipative steel cushions (Ozkaynak et al 2018;Gullu et al 2019). In parallel to the development of the hardware, viable design procedures and configurations of dissipative bracing systems incorporating metallic dampers have been envisaged for the seismic retrofitting of existing r.c and steel buildings (Akcelyan et al 2016;Barbagallo et al 2017;Bergami et al 2013;Di Cesare et al 2017a;Durucan et al 2010;Mazza et al 2015a;2015b;2016a, b;Nuzzo et al 2019;O'Reilly et al 2016;Gandelli et al 2019;Mohammadi et Al.…”

Probabilistic framework to evaluate the resilience of engineering systems using Bayesian and dynamic Bayesian networks

“…Fuzzy theory represents a method for solving problems that are related to uncertainty and vagueness. It has been implemented in some research works to study the resilience of infrastructure systems (De Iuliis et al 2019a;Kammouh et al 2018e;Kammouh et al 2018f). Fuzzy theory is usually implemented in cases with no data, which is replaced with expert judgments.…”

Testing Requirements of Hysteretic Energy Dissipating Devices According to Italian Seismic Code

“…Passive control systems of earthquake and wind excitations based on energy dissipation techniques have achieved significant progress for existing buildings over the last three decades. One of the most effective and inexpensive solutions to minimize damage of structures is dissipating energy through the yielding of metallic materials [1], [2]. The elements are so shaped as to have a uniform strain distribution in their parts deputed to the energy dissipation function and, then, to maximize their low-cycle fatigue resistance [3], [4].…”