Abstract
This paper describes the seismic performance of a steel frame with additional LYP steel dampers. LYP steel dampers provides passive energy dissipation device in a structure, it also reduces the lateral forces in efficient way which is produced by seismic wave. The seismic performance of structures is needed in the design of structure, especially in countries where seismic activities occur. This analysis is accomplished with the FEM and software called SAP2000. The steel frame is only analyzed using numerical simulation. This paper describes two steel frames, the first steel frame is a two story steel frame without LYP steel dampers while the second steel frame has with LYP steel dampers. The seismic mechanism analysis was accomplished with the help of nonlinear time history analysis technique and the results for inter-story drift, steel frames, base shear, the displacement of the top story and the stress of the dampers was obtained. The time history analysis was taken out with three different earthquake waves according to the Chinese code for the seismic design of buildings; the earthquake waves were divided into the three different earthquake levels in China which include the frequent, moderate and rare earthquake level. The seismic mechanism analysis was accomplished on the three different earthquakes and three different earthquake levels in China. The modal analysis was taken to obtain the frequency and the period of the steel frames. The steel frames were examined under the different load combination which is also described in the code for the seismic design of buildings to obtain the internal forces of the members of the steel frame which include the axial force, shear force and bending moment. The different load combinations are used to get the stress of the dampers. We notice that the addition of LYP steel dampers increases the seismic resistance of the steel frame as we can observe by a reduction in the displacement of the top story, base shear, and inter-story drift angle by the addition of LYP steel dampers on the steel frame. We can be able to observe the behavior of the frames under the different earthquake levels in China using the pushover analysis.
Highlights
Earthquakes have always been taken into consideration when constructing an engineering structure, other branches of civil engineering have sprung up to study the effects of earthquakes, and the best possible ways to prevent structural failure
We summarized different results obtained from the two steel frame models that are the steel frame model without low-yield-point steel (LYP) steel dampers and the steel frame with LYP steel dampers, this will give us a summary about the different behavior of the two structures under seismic forces
We observed an increase in the frequency of the steel frame with LYP steel dampers as the frequency is inversely proportional to the period
Summary
Earthquakes have always been taken into consideration when constructing an engineering structure, other branches of civil engineering have sprung up to study the effects of earthquakes, and the best possible ways to prevent structural failure. THE SEISMIC ANALYSIS AND PERFORMANCE OF STEEL FRAME WITH ADDITIONAL LOW-YIELD-POINT STEEL DAMPERS. Structural seismic control is to change or adjust the dynamic characteristic or dynamic action by installing devices (such as a seismic isolation bearing), some mechanisms (such as energy-dissipation braces and joints, fluid viscous damper, and metallic damper), some substructure (such as tuned mass damper), or external force (such as external energy input) in a certain part of structure [2]. By using plastic hysteresis deformation of different forms of metals to dissipate energy, low-yield-point metal damper has superior hysteretic characteristics and absorbs a large amount of energy in the process of plastic hysteresis. X. Yan [18] investigated the shaking table tests and nonlinear analysis of a six-story steel frame structure model with and without oval steel-lead damper were performed and compared. HuanHuan [30] analyses the drift angle of two types of structural systems which are steel frame and steel-support frame, they are grouped into different types of steel frame and steel-support frame groups and they are compared to the drift angle limit in different countries limit and their performance level according to the drift angle limits are found
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