THE HELICAL SPRING PERFORMANCE OF STEEL BARS BY EXPERIMENTAL AND ANALYTICAL STUDIES

This study investigated a helical spring damper that functions as a passive energy-dissipation device with a yielding mechanism by plastic deformation. This study discusses the application of helical springs as passive energy-dissipation device in low-rise residential buildings, using available materials. The tested helical spring was evaluated by comparing analytical and experimental results in terms of yield strength and yield displacement. The yield strength and yield displacement, effective stiffness, and damping values obtained from the laboratory test data were used to determine the ability of the helical spring to accept loads. During laboratory testing, steel bars with diameters of 6, 8, 10, 12, 16 and 19 mm were used to form helical spring with varying coil counts of 1, 2, 3, and 4. The test was conducted using a shaking table set to a frequency of 0.5 Hz. Among these configurations, the large the diameter of the steel bar in the helical spring, the higher the yield strength. Moreover, a larger steel bar diameter caused an increase in the effective stiffness of the helical spring, and an increase in the number of helical spring coils resulted in a lower damping value for the same displacement control.