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• W132759339 abstract "A feasibility study on the development of a prototype tool to determine the required amount of viscoelastic damping in a high rise structure to reduce accelerations from wind-induced vibrations Introduction The research regarding damping in high rise structures from wind-induced vibrations has been split up into two investigations: 1. Investigation on viscoelastic damping (VED) 2. Investigation on modeling a N mass spring damper (N-MSD) system as a basis for the prototype tool Literature showed that VEDs are most effective in shear and even though a VED is often referred to as non-linear, the material behaves linear for small values of the damping ratio. This region has been studied in the investigation on VED. Physical test set-up In literature, no information is available on the relation of VEDs to the load bearing structure in buildings. Therefore, a physical test set-up was built to study the relation. The physical test set-up was constructed as a braced portal frame structure with a slenderness of about 6. Layers of SBR (natural rubber) were applied to the bracing to simulate dampers in a structure. Multiple dampers have been tested with a variety in thickness. This was based on the expectation that the thickness of the layers would have an optimum value with regards to the shear stiffness. The half-power bandwidth method was used to determine the damping ratio of the structure with and without damping in the frequency domain. To verify the obtained values, the damping ratio has also been determined from the time signal through the logarithmic decrement. Both methods showed the same results. N-MSD In this research, a model has been presented for the core structure with structural damping by means of an N-MSD system. The model has been validated in two ways. The stiffness matrix was validated by finding the static behavior of the structure and the eigenmodes from the structure. Additionally, the peak values for the accelerations come close to the maximum allowed values mentioned in NEN-EN 1990+A1+A1/C2-2011. Also, a mathematical expression for a braced portal frame structure including an auxiliary damping component has been presented. In this case, all elements in the portal frame structure are described by a continuous system. Additionally, a model for the bracing with and without a damping component is to be used. Conclusions The following damping factors were observed within the damping component: 1. Damping by friction 2. Material damping 3. Damping by adhesive layer (glue) If a higher damping coefficient is required to reduce accelerations, each of these factors may be changed. However, the exact energy dissipation by each individual factor in the damping component and in the connections remains still unknown. The only certainty is that the system as a whole dissipates energy from the structural system and reduces the accelerations. The measurements were also influenced by many factors, such as disturbances from higher frequencies and executional factors. The description of the core structure model and of the portal frame structure prove that it is indeed feasible to develop a prototype tool to determine the required amount of VED. However, in case a prototype tool is to be developed, input of experimental data of the damping coefficient of the VEM layer is required." @default.
• W132759339 created "2016-06-24" @default.
• W132759339 creator A5062053065 @default.
• W132759339 date "2014-01-01" @default.
• W132759339 modified "2023-09-24" @default.
• W132759339 title "Viscoelastic damping in high rise structures" @default.
• W132759339 hasPublicationYear "2014" @default.
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