Seismic performance of prefabricated staggered truss-steel chord cross-shaped joints

To accurately investigate the variation characteristics of building structures during earthquakes and enhance seismic safety, this study proposes a seismic performance analysis of prefabricated steel staggered truss joints with cross-shaped chord connections under vertical loads. Taking a specific building structure as the research subject, three different specimen types are designed: a cast-in-situ specimen, a precast specimen with anchored rebar connections, and a precast specimen with penetrating rebar connections. The performance parameters and reinforcement details of the specimens are documented, appropriate testing equipment is selected, and cyclic loading tests are performed according to a predefined loading scheme. The test results indicate that all three specimens exhibit high ductility coefficients, stable hysteretic curves, strong ultimate horizontal load capacity, and noticeable stiffness degradation during loading, demonstrating favorable seismic performance of the proposed joint design.