Experimental Study on Joint Properties of Steel Secondary Beam Connected with Concrete Main Beam Using an Embedded Part

Abstract

Abstract In this paper, a joint of I-shaped steel secondary beam connected with concrete main beam using an embedded part was simplified from a practical engineering by adopting the scale 1:3. Six specimens were tested. The effects of different concrete main beam heights (245 mm and 295 mm), concrete floor slab, rigidity of steel secondary beam and height difference between the secondary beam and main beam tops on the mechanical performance and failure mode of specimens were analyzed. Results show that flexural failure is often found in the steel secondary beam. But the failure mode is changed to joint failure in the main beam if the rigidity of steel beam is increased locally at the mid-span region. Moreover, setting floor slab and increasing rigidity of steel secondary beam can all improve the load-carrying capacity of the joint. The safety of joint can be obtained by strengthening the stirrups adjacent to the embedded part and longitudinal steel bars under the part.