Application of Finite Element Method to Simulate Viscous Dampers Applied to High-tech Factories

Abstract

SUMMARY At present the technology industry plays a very important role in Taiwan Therefore the demand for earthquake resistance of technology factories is also increasing However Taiwan is located in the seismic zone so how to resist the earthquake will be an important issue High-tech factories are often supported by steel members that are braced so it is possible to use fluid viscous dampers as a means of reinforcement This study starts from the most basic damping force formula to derive its theoretical solution and uses computer-aided analysis The basis of this analysis is to use the finite element method to present the damping force After several sets of data comparison it can be known the gap between the theoretical solution and the finite element method If the values are similar the finite element method computer-assisted analysis can be used to simulate the behavior of the fluid viscous dampers The computer-aided analysis was developed by the research team of Shen-Haw Ju and the analytical programs are open and free to use In this study the computer-assisted analysis method of finite element method is simulated into a fluid viscous damper and placed in an existing high-tech factory model This paper sets the maximum acceleration of the ground in two cases and loads it in this high-tech factory In this model when the damper is placed the X-direction base shear force the Y-direction base shear force and the Z-direction vertical force are recorded In addition when the damper is not placed the X-direction base shear force the Y-direction base shear force and the Z-direction vertical force are recorded The relationship between the base shear force and the vertical force and time is sorted out In this high-tech factory model through the above experimental data we can know whether the installation of a fluid viscous damper is effective in helping to resist earthquakes Keywords: earthquake finite element analysis High-tech factory Fluid Viscous Damper base shear axial force INTRODUCTION Taiwan is located in the Pacific Rim seismic zone It is pushed by the Eurasia plate and the Philippine Sea plate Many earthquakes occur every year However according to the current technological conditions it is difficult for us to grasp the earthquake in advance For important buildings such as nuclear power plants buildings for public use high-tech factories hospitals buildings providing emergency shelters We must all strengthen these buildings to avoid the huge damage caused by the earthquake In view of this how to improve the building's ability to resist earthquakes will be our primary goal The high-tech factories is a very important industry in Taiwan so the demand for technology plants is becoming more and more demanding especially for factories that produce wafers How to overcome this problem it must be faced with a very cautious attitude MATERIALS AND METHODS Using the finite element method program numerical simulation the relationship between time and displacement in different ? values is analyzed and the theoretical solutions that have been derived are analyzed to compare the differences The model of the damper is established by the finite element method Add the model to the technology factory give the seismic force effect record the base shear force separately without the damper and with the damper collect this data and analyze it RESULTS AND DISCUSSION After analyzing the two cases of TS = 0 8(s) and TS = 1 4(s) it can be observed that the effect of adding the damper affects the X-base shear force the Y-direction base shear force and the Z-direction axial force The reduction is not high and even some values will increase In view of the economic benefit it does not meet the expected value and the added cost of the damper is not obvious in reducing the X- and Y-direction base shear forces and the Z-direction axial force Thus the general diagonal strut structure is used It seems that it can already meet the needs of use CONCLUSION 1 Using a finite element computer simulation analysis to simulate a fluid viscous damper the results are similar to the theoretical solution and have reference value 2 Select the parameter ?=0 4 damping coefficient C=2377 kN?(s/m)?^0 4 Install the fluid viscous damper in the form of a diagonal bracing placed in the Y direction of the high-tech factory of this paper model it couldn’t obviously help 3 For this type of high-tech factory the ordinary steel frame can be braced because the cost of fluid viscous dampers is not cheap but it can not get the effect it deserves The base shear force in the X direction or the base shear force in the Y direction or the vertical direction force in the Z direction is not significantly reduced This is very uneconomical so it is recommended to use the steel frame bracing method 4 Even if a fluid viscous damper is added the base shear force in the X direction and the Y direction sometimes rises indicating that it is not a good method to increase the damping force 5 First experiment with Ts=0 8 then increase to Ts=1 4 and the ground acceleration will increase accordingly and the overall response will be above the base shear force At this time a fluid viscous damper will be added to deal with the base shear force In the larger case the magnitude of the reduction should be obvious but from the experimental data there is no obvious help for reducing the base shear force

Date of Award	2019
Original language	English
Supervisor	Shen-Haw Ju (Supervisor)