Application Research Of Viscous Fluid Damper In Seismic Strengthening Of An Existing Frame Structure Building

With the improvement of building science and technology,the application of seismic energy dissipation technology in the seismic design of structures is gradually deepened.Viscous dampers are commonly used in seismic energy dissipation structures.Adding viscous dampers to existing frame structures can effectively improve the energy dissipating capacity of the structures,improve their seismic performance,make the strengthened structures meet the requirements of the current seismic code,extend their service life,a nd effectively utilize social resources.Therefore,it is of practical significance to study the application of viscous dampers in seismic reinforcement of existing frame structures.For research after adding viscous dampers have effect on seismic response of frame structure buildings,in this paper,the working principle of viscous dampers and structure design theory research,in a three layer reinforced concrete frame structure building as the research object,on the test,according to the results of identification,design of reinforcement scheme,structure with viscous dampers for seismic strengthening,adopt the method of time history analysis,analysis of the reinforced buildings in many seismic performance and under the action of the rare earthquake.The main research work and results of this paper are as follows:(1)Carry out onsite inspection and seismic verification of the original building.Through the inspection and appraisal of the existing status of the project,the main structure layout of the building is basically consistent with the original construction drawing design document,the appearance inspection shows that there is no obvious structural damage,most of the components conform to the original design requirements,and there is no damage affecting the overall safety of the structure.The aseismic calculation of the structure is carried out.The structure can meet the seismic precautionary requirements of 7degrees(0.15g),but it cannot meet the seismic precautionary requirements of 8 degr ees(0.2g)after the seismic precautionary requirements are increased,so the seismic strengthening is needed.(2)According to the testing results,the design seismic strengthening scheme of viscous dampers,using PKPM software calculate additional damping ratio 5%,10%,15%,of the interlayer displacement angle of different additional damping ratio and dosage of steel is analyzed,the result shows that when 15% additional damping ratio,structure satisfies the requirement of seismic precautionary ascensio n,to determine the parameters of viscous dampers,quantity and arrangement.The structure model of energy dissipation and shock absorption was established by using SAUSAGE software.(3)Use SAUSAGE software to analyze the dynamic time history of the exist ing frame structure buildings with added viscous damper under the action of frequent and rare earthquakes,and analyze the interlayer displacement angle,structural energy dissipation and structural damage of the structure through the calculation results.The results show that the building structure with viscous damper can meet the requirement of seismic fortification intensity of 8 degrees 0.2g,the structure remains elastic under the action of frequent earthquakes,and the structural members are not serio usly damaged under the action of rare earthquakes.The viscous damper can dissipate most of the energy input from the earthquake,improve the energy dissipation capacity of the structure as a whole,and make the performance index of the structure meet the requirements of the seismic design code.