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<p>One method for enhancing structural integrity involves incorporating cable braces. This study introduces a novel cable bracing system equipped with a friction-based damper. The damper consists of a pre-stressed cable passing through two pulleys, generating frictional contact. Analytical methods and finite element modeling (FEM) are employed to analyze this system, aiming to dissipate energy within structural frames and resist lateral loads. These methods are used to determine the optimal distance between the two pulleys for maximum energy dissipation, followed by an investigation of the system’s behavior. A defining characteristic of the proposed system is its two-phase behavior: it exhibits linear behavior with high stiffness for small displacements and nonlinear behavior with increasing stiffness for larger displacements. The system’s performance is governed by three key parameters: the friction coefficient, the span length, and the initial pre-stressing force of the cable. An increase in the friction coefficient leads to a corresponding rise in axial force and lateral resistance. Moreover, when the cable undergoes an additional rotation around the pulleys, the lateral resistance in the linear and nonlinear phases increases by 3.2 and 2.6 times the base state, respectively. Conversely, as the span length increases, both the axial force and lateral resistance of the system decrease. Furthermore, a higher initial pre-stressing force enhances system stiffness, enabling the system to remain in the linear phase for a longer range of displacements before reaching the slip threshold. Using the ATC-24 loading protocol, the cyclic behavior of moment frames with eccentric chevron-inverted V and eccentric Split-X cable bracing was examined. Incorporating the proposed cable bracing system into the moment frames significantly increased frame stiffness and energy dissipation compared to moment frames without such bracing. Notably, the energy dissipation of the frame with the proposed bracing system was 53.5% higher than that of the unbraced moment frame.</p>

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Analytical and Numerical Study of a New Friction-Based Damper in Eccentric Chevron Inverted V Cable Bracing

  • 期刊论文

  • 发表日期：

    2025年2月18日

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  • Nader Fanaie,
  • Hanieh Mohammadpour Roshan

摘要

One method for enhancing structural integrity involves incorporating cable braces. This study introduces a novel cable bracing system equipped with a friction-based damper. The damper consists of a pre-stressed cable passing through two pulleys, generating frictional contact. Analytical methods and finite element modeling (FEM) are employed to analyze this system, aiming to dissipate energy within structural frames and resist lateral loads. These methods are used to determine the optimal distance between the two pulleys for maximum energy dissipation, followed by an investigation of the system’s behavior. A defining characteristic of the proposed system is its two-phase behavior: it exhibits linear behavior with high stiffness for small displacements and nonlinear behavior with increasing stiffness for larger displacements. The system’s performance is governed by three key parameters: the friction coefficient, the span length, and the initial pre-stressing force of the cable. An increase in the friction coefficient leads to a corresponding rise in axial force and lateral resistance. Moreover, when the cable undergoes an additional rotation around the pulleys, the lateral resistance in the linear and nonlinear phases increases by 3.2 and 2.6 times the base state, respectively. Conversely, as the span length increases, both the axial force and lateral resistance of the system decrease. Furthermore, a higher initial pre-stressing force enhances system stiffness, enabling the system to remain in the linear phase for a longer range of displacements before reaching the slip threshold. Using the ATC-24 loading protocol, the cyclic behavior of moment frames with eccentric chevron-inverted V and eccentric Split-X cable bracing was examined. Incorporating the proposed cable bracing system into the moment frames significantly increased frame stiffness and energy dissipation compared to moment frames without such bracing. Notably, the energy dissipation of the frame with the proposed bracing system was 53.5% higher than that of the unbraced moment frame.