عنوان مقاله [English]
Observation of induced damages to structures after Northridge 1994 shows that in many cases, against expected behavior, the brittle fracture has been accrued in connections at the level plastic rotation much lower than demand rotation. In some cases, the whole structure remained elastic. The damage in WSMRF, which was contrary to the expectations of the engineers, changed the attitude of the WSMRF. Thus, engineers decided to introduce more ductile and detailed connections. Post-Tensioned Connection (PTC) is one of the new connections proposed by them. PTC includes high strength, pre-tensioned cables to create self-centering properties and energy dissipation to control plastic deformation. In this study, the numerical modeling of the PTC was performed using the ABAQUS finite element software. In addition, to verify the model accuracy with the experimental results, 3 types of connection were modeled and the effects of using angle and reinforcing plate wither higher length and width, greater post tension force and the application of web angle on the cyclic behavior of connection has been evaluated. Based on the characteristics of models and in the range of models of this paper, the results show that FE modeling could reflect all characteristics and cyclic behavior of post-tensioned connection effectively. Also increasing the length and width of reinforcing plate may lead to increase the moment capacity, energy dissipation, and connection stiffness respectively. In this case, the elastic stiffness of connection is almost equal to the stiffness of welded rigid steel connection. In addition, with 20 KN increasing in the post tension forces, the connection strength increases about 6% and also energy dissipation decreases slightly. The second result opposite the result of reference 14. Finally, using web angle as a new suggestion can develop the moment capacity and strength, energy dissipation and stiffness. This factor can decrease the relative rotation of connection.