Abstract:Two fullscale tubular T and N joints were tested under cyclic quasistatic loadings to understand their performance under seismic loading. A constant load was applied on the axial direction of the chord during cyclic loading. In the tests, local buckling was observed at the chord in the intersection area. Stripes were found on the chord surface. Crack propagation between the chord and the brace led to the final failure of two joints. The energy analysis indicated that more energy dissipated in the N joint during the compressive half of the cycles than in the tensional half. For T joint specimens, energy dissipation was almost equal during the two halves of the cycles. The hysteretic behavior curves also revealed that the specimens had adequate ductility under cyclic loading.