A Finite Element Analysis of the Effects of TADAS Dampers on the Frame Members’ Performances in Concrete Structures Under Cyclic and Monotonic Loadings

Abstract

Harsh loading conditions, such as ground vibrations from earthquakes, can reduce the ductility of large structures due to their weight and cause damage and early destruction. The research explores the use of Triangular added-damping-and-stiffness (TADAS) dampers in concrete moment frame structures to assess their impact on reducing floor displacement. The study examines the impact of two different alloys, ST52 and H13, used in the TADAS damper pins. It analyzes how the TADAS structural geometry and the mechanical behavior of its ductile alloys affect the stability of concrete structures under various cyclic and monotonic loading conditions. The finite element method implemented in ABAQUS is utilized to simulate the TADAS damper under both monotonic and cyclic loading conditions. The research findings include a novel modification of alloy materials, such as H13 steel, to enhance damper flexibility, optimization of damper geometry to increase seismic energy dissipation, and improvement in structural integrity to reduce stress concentration. Comparing two ST 52 alloys to H13 steel, the maximum bearable force has increased from 300 kN to 600 kN, which is about double the resistance increase. Practical applications of integrating TADAS dampers and Chevron braces in tall and low-rise concrete buildings show significant improvements in structural stability and displacement reduction. The results indicate that the base shear, the maximum relative displacement of the floors in height, and the increase of the internal force generated in the beam and column have decreased in the structure with yielding damper compared to the structure without damper. The research results for the 15-story structure show that without using a damper, the maximum relative displacement of the floor is 150 mm. However, when a damper is used, the maximum relative displacement is reduced to about 60 mm. This study highlights the practical implications of using TADAS dampers in structural engineering and offers a promising solution to minimize the destructive effects of seismic events on large-scale concrete structures.