Value obtaining method-comprehensive method of additional effective damping ratios of energy dissipaters with energy dissipation and shock absorption structures

Abstract

The invention discloses a value obtaining method-comprehensive method of the additional effective damping ratios of energy dissipaters with energy dissipation and shock absorption structures. The method comprises the steps of extracting inter-floor shear force values Fit and inter-floor displacement values uit corresponding to seismic wave moment points after the energy dissipation and shock absorption structures are subjected to finite element elastic-plastic time-history analysis; obtaining total strain energy Wst of the energy dissipation and shock absorption structures at the seismic wave moment points and getting a maximum value max[Wst] of the total strain energy Wst; obtaining the sum Sigma Wcj of dissipative energy of all of energy dissipaters; performing calculation to obtain the additional effective damping ratios 8 a of the energy dissipaters with the energy dissipation and shock absorption structures; assessing whether the additional effective damping ratios 8 a of the energy dissipaters are larger than or equal to additional effective damping ratios set for performance objectives of the energy dissipation and shock absorption structures. In the method, the number and the positions of the energy dissipaters are constantly optimized in the accurate computation result obtaining process, the energy dissipaters are appropriate in selection and arrangement, the economic purpose is achieved while the requirement for dissipating seismic energy to the most extent is met, and the construction cost is reduced.

Description

technical field [0001] The invention relates to the design and analysis technology of energy dissipation and shock absorbing structures in the technical field of building structures, in particular to a method for obtaining the additional effective damping ratio of an energy absorber of an energy absorbing and shock absorbing structure—a comprehensive method. Background technique [0002] The earthquake resistance of traditional building structures mainly consumes seismic energy through the damage of structures and components during earthquakes, and the serious damage of structures and components is the process of conversion or consumption of seismic energy. In recent years, with the frequent occurrence of earthquakes in our country, the building structure has been severely damaged, endangering people's lives and property safety. Since the mechanism of the "hard" earthquake resistance of the structure is difficult to meet the effective control requirements, the "soft" earthqu...

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Problems solved by technology

[0016] However, the additional effective damping of the energy absorber in the energy-dissipating structure is time-varying damping, and the additional damping of each energy-dissipating structure is a time-varying parameter. The response changes with the acceleration of the seismic wave, which makes the energy dissipation of the energy dissipation device time-varying

When the envelope method is used to calculate the structural strain energy, the maximum value of the floor shear force and floor displacement is taken as the seismic response, so the calculated strain energy is the envelope value, and the energy dissipation of the energy dissipation device is taken as the area of ​​the outermost circle of the hysteresis curve The value taken is the actual envelope value of the energy dissipation of the energy dissipator. Therefore, although the calculation process of the envelope method is simple and convenient, the calculation result is relatively conservative and the accuracy is poor.

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