Prestressed rectangular steel tubular truss with cantilever and compressed chords filled with concrete

Through the comparing tests of three large speciments of the long-span prestressed concrete-filled rectangular steel tubular truss(RSTT) with cantilever,the prestressed RSTT and the concrete-filled RSTT,their mechanical behaviors,such as the destroy mode,the deformation feature,and the loading capacity were investigated.The test results show that the ultimate strength of the prestressed concrete-filled RSTT is larger than the concrete-filled RSTT and the prestressed RSTT,and the deflection of the former is smaller than that of both the latter.Filling with concrete in the steel tube can effectively prevent the compressed steel tube from the local buckling,and the destroy mode of the truss is controlled by the strength of material.The obtained results provide a valuable reference for the engineering design of the truss.