Abstract
An innovative hybrid frame with high stiffness steel connection was developed to overcome the limitations of a conventional hybrid beam system, which has been proved to have an adverse impact on the reliability of bolted or welded connections due to plastic hinge development in the steel joint section. To examine the cyclic behavior of this structural system with innovative connections, the hybrid frame has been tested under reversed cyclic loads. The mechanical process, failure patterns, hysteretic characteristics, skeleton curves, ductility, and energy dissipation capacity were considered. In addition, a reliable nonlinear finite element model of the hybrid frame, including the material nonlinearities of concrete, steel beam, stud, rebar, and tendon, has been developed to investigate the behavior of the new type connection. An enhancement coefficient α for the flexural bearing capacity of steel beams to the demand flexural capacity of hybrid beams was proposed. Specimens with different α were analyzed, and a conservative suggestion of α⩾1.5 was given. An extensive parametric study with the changes in axial load ratio, slab width, and beam-to-column stiffness ratio was conducted.
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