Analytical Investigation of The Effects of Joint Stiffness Losses on The Dynamic Behavior of Steel Structures

Abstract

Steel structures are frequently preferred in the construction sector due to their high strength and ductility. However, repeated loads, environmental factors, and overloadings can cause damage, leading to significant changes in their dynamic behavior. Understanding these damage effects is crucial for structural health monitoring and retrofitting. This study analytically investigates the effects of stiffness losses in steel frame systems on dynamic behavior. A two-story steel structure was modeled with plastic hinges at member ends to capture non-linear behavior. To simulate structural damage, various scenarios were created by reducing joint stiffness at different ratios. The model was analyzed under two distinct sinusoidal loads with different periods. Changes in acceleration and displacement values at specific node points on the first and second floor levels were comparatively evaluated. Results indicate that stiffness loss significantly alters the dynamic response depending on the degradation ratio, with notable variations across floor levels. Consequently, dynamic response metrics specifically acceleration and displacement data effectively evaluate stiffness losses in steel structures.