Investigation of Friction Damper Behavior in Cross Braces Subjected to Blast Load

Several hazards often affect the stability of structures, and when designing and analyzing the structure, this should be considered. With increasing seismic strength of the structure, the strength of the structure increases against other forces, such as the explosion force. One of the most commonly used building design systems for lateral loads is the use of a cross bracing system. Using cross braces with friction damper can have more damping and energy absorption compared to cross braces without friction damper; it will behave better in big bangs. In this paper, the effect of cross braces with a friction damper and no friction damper on the performance of concrete structures against explosive force has been studied. For this purpose, the displacement and relative displacement of the floors in different modes of loading of the explosion have been calculated. Finally, the results show the effect of friction damper on reducing lateral displacement and relative displacement of the floors, so that in the structure with the damper compared with the structure without a damper, the lateral displacement and relative displacement of the floors significantly decreased. Studies show that adding a friction damper to the structure increases the stiffness of the structure, so the frequency of the structure is reduced.