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Structural Engineering and Mechanics
  Volume 82, Number 1, April10 2022 , pages 107-120

Improving the seismic behavior of diagonal braces by developing a new combined slit damper and shape memory alloys
Farzad Vafadar, Vahid Broujerdian and Ali Ghamari

    The bracing members capable of active control against seismic loads to reduce earthquake damage have been widely utilized in construction projects. Effectively reducing the structural damage caused by earthquake events, bracing systems equipped with retrofitting damper devices, which take advantage of the energy dissipation and impact absorption, have been widely used in practical construction sites. Shape Memory Alloys (SMAs) are a new generation of smart materials with the capability of recovering their predefined shape after experiencing a large strain. This is mainly due to the shape memory effects and the superelasticity of SMA. These properties make SMA an excellent alternative to be used in passive, semi-active, and active control systems in civil engineering applications. In this research, a new system in diagonal braces with slit damper combined with SMA is investigated. The diagonal element under the effect of tensile and compressive force turns to shear force in the slit damper and creates tension in the SMA. Therefore, by creating shear forces in the damper, it leads to yield and increases the energy absorption capacity of the system. The purpose of using SMA, in addition to increasing the stiffness and strength of the system, is to create reversibility for the system. According to the results, the highest capacity is related to the case where the ratio of the width of the middle section to the width of the end section (b1/b) is 1.0 and the ratio of the height of the middle part to the total height of the damper (h1/h) is 0.1. This is mainly because in this case, the damper section has the highest cross-section. In contrast, the lowest capacity is related to the case where b1/b=0.1 and the ratio h1/h=0.8.
Key Words
    energy absorption; reversibility; shape memory alloys; slit damper
Farzad Vafadar: Department of Civil Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran
Vahid Broujerdian: School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
Ali Ghamari: Department of Civil Engineering, Darreh Shahr Branch, Islamic Azad University, Darreh Shahr, Iran

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