Abstract: The connection between steel and concrete aimed to be enhanced through investigating and developing the composite action affects on overall behavior of composite bridge. Among different types of connectors available today, the perfobond connector is suggested to enhance the connection properties. The push-out test is used to investigate the resistance capacity of the available regular perfobond connector. Several finite element models are developed and verified to simulate the push-out test specimen, shell element, solid element and bar element with both geometric and material nonlinearities. The verified finite element model is then used to test the applicability of the newly suggested connectors, replacing circular holes in the regular perfobond connectors by triangular one. The resistance capacities predicted for the newly suggested shapes seem to be close to that predicted from the regular perfobond connector. The results indicate that the new connector is applicable and supposed to be more reliable in steel-concrete composite structure, predicting more integrity between concrete. A recommendation on performing more studies on the newly suggested connectors are withdrawn due to the sensitivity of the connector to the dimension and shape of hole.