Comparing the Performance of Short Link Beam in Buckling Unrestrained and Restrained Eccentric Braced Frames under non-linear Static and Dynamic Analysis
Subject Areas : Analysis of Structure and EarthquakeArash Hossein Shahi 1 , aboozar saleh 2
1 - Master Student Of Structure Islamic Azad University of Tafresh
2 - civil engineering department،Islamic Azad University Professor Hesabi Branch،tafresh،Iran
Keywords: Time History Analysis, Nonlinear Static Analysis, Non-Buckling Braces, link beam, SeismoStruct 2016 Software,
Abstract :
According to the fact that our country is located in one of the seismic zones of the world, the possibility of strong earthquakes in different regions is inevitable. Over the past years, researchers have proposed different systems for absorbing and dissipating earthquake energy in structures, which, in this regard, unrestrained buckling braces have been focused by engineers. The purpose of this research is to examine the behavior of short link beam in steel frames with buckling and non-buckling braces. For this purpose, three structures, 3, 6 and 9 stories with buckling and non-buckling braces are designed according to valid regulations and all seismic rules have also been controlled. Then, their lateral two-dimensional frame is modeled with eccentric braces on the SeismoStruct 2016 software. In order to investigate the behavior of the link beam, nonlinear static and time history analysis have been used for three far-field earthquakes and type 2 soil. In the following, the results of the shear force and the bending moment of the link beam and the nonlinear static analysis curves of the frames in two models with buckling and non-buckling braces are compared. The results of nonlinear static analysis show that the moment and shear in the non-buckling link beam can be up to 38 and 50 percent more than the frame with buckling braces, respectively. Non-linear time history analysis shows a higher growth of link beam forces in a frame with non-buckling braces than nonlinear static analysis.
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