In this case, extra stiffeners installed between the length of PE beam, referred as intermediate stiffeners, may provide extra constraint and further enhance the composite action.
The effectiveness of column constraint and intermediate stiffeners, such as midspan stiffener and plastic hinge zone stiffener, was investigated.
Effectiveness of Intermediate Stiffeners. Since premature failure of the PW specimens was observed, it is more reliable to compare the effectiveness of composite action based on test results from PS specimens.
Caption: FIGURE 3: The test scheme for beam specimens (unit: mm); adapted from "The Effect of Intermediate Stiffeners on Steel Reinforced Concrete Beam Behaviors" .