Abstract
The damping ratio of an added-story frame structure is established based on complex damping theory to determine the structure seismic response. The viscous dampers are selected and arranged through target function method. A significant damping effect is obtained when a small velocity index is selected. The seismic responses of a five-floor reinforced concrete frame structure with directly added light steel layers and light steel layers with viscous dampers are compared with the finite element software SAP2000. Calculation results show that, after adding the layers, the structure becomes flexible and the shear in the bottom layer decreases. However, the interlaminar shear of the other layers increases. The seismic response of the added layers is very significant and exhibits obvious whiplash effect. The interstory displacement angles of some layers do not meet the requirements. The seismic response of the structure decreases after the adoption of viscous dampers; thereby seismic requirements are satisfied.
Highlights
Added-story frame structures in seismic zones must meet the requirements of foundation-bearing capacity as well as the requirements of the current seismic design code
The results showed that (1) the structure had no obvious weak layer and met the code for the seismic design of buildings and (2) the dampers produced a certain energy dissipation effect, which improved seismic performance
The results showed that damping ratio can be improved by adding viscous dampers; story drift and interlaminar shear can be reduced
Summary
Added-story frame structures in seismic zones must meet the requirements of foundation-bearing capacity as well as the requirements of the current seismic design code. Ma et al [2] employed the finite element software ANSYS to analyze the seismic performance of a four-floor reinforced concrete frame structure with two-floor steel frame added layers in an office building. The results showed that (1) the structure had no obvious weak layer and met the code for the seismic design of buildings and (2) the dampers produced a certain energy dissipation effect, which improved seismic performance. Only a few studies have focused on the design of energy dissipation reinforcement, especially in added-story structures Such design requires the theoretical analysis of seismic performance indicators and comparative analysis of seismic performance and other parameters of the structures after adopting viscous dampers. The seismic responses of directly added layers and added layers with viscous dampers were compared and analyzed with the finite element software SAP2000 in this study to provide a theoretical basis for practical engineering
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