New RCFST Composite Truss Bridge Structural Types and Green Construction

With the implementation of the "dual carbon" strategy by the country and the arrival of the era of industrial construction, bridges as lifeline node projects are being developed toward assembly and industrialization. As a high-performance composite structure bridge type, the concrete-filled steel tubular (CFST) composite truss bridge has bearing capacity, disaster resistance, and assembly advantages. Integrating the concepts of "industrial construction" and "green building materials" effectively achieves the green construction of CFST truss bridges. Therefore, regarding high transmission systems, high-bearing-capacity structural constructions, and high-bearing-capacity joints, a rectangular concrete-filled steel tubular (RCFST) composite beam bridge is a high-performance bridge structure. Further, considering high resilience and economy, the advantages of the RCFST composite truss bridge are discussed, and the seismic performance and economy of a conventional concrete beam bridge are compared. Subsequently, the concept of the industrialized construction of RCFST composite truss bridges was elaborated from the perspective of fully prefabricated assembly units and on-site rapid assembly of prefabricated parts, and structural measures suitable for rapid assembly were proposed. Applying alkali-activated UHPC concrete, which has the advantages of green and high strength, to CFST composite beam bridges was conceived and envisaged. Finally, typical engineering practices confirmed that CFST composite truss bridges are lightweight and high-strength, have clear force transmission, and exhibit efficient assembly and construction performance. © 2023 Xi'an Highway University. All rights reserved.