Assessment of seismic behavior of X-bracing with different types of middle connection

Behrouz Vafaei¹ Seyed Rasoul Mirghaderi²

1) Department of Civil Engineering, Sofian branch, Islamic Azad University, Sofian, Iran
2) Department of Civil Engineering, University of Tehran, Iran

Publication : The 4th International Congress On Civil Engineering, Architecture & Urban Development(4icsau.ir)
Abstract :
X-bracing behavior is more complex and its energy absorption hysteresis loop is different from other concentric bracing systems due to interaction between tension and compression braces. In this study, seismic behavior of x-bracing system with different common types of middle connection has investigated under monotonic and cyclic loading. In the other words, the inelastic buckling of compression brace and plastic behavior of tension bracing with modeling in OpenSees software has studied numerically. The obtained results from analysis models show that with rigid connection in the middle connection of the x-bracing system, seismic behavior is more symmetrical and energy absorption difference in both direction of loading is less. So generally, seismic behavior of x-bracing with rigid middle connection is better than seismic behavior of x-bracing with simple middle connection.
Keywords : x-bracing seismic behavior inelastic deformation buckling