Abstract:
At present, the cross section forms of concrete-filled steel tubular arches which utilized in roadway support are mainly circle, square and D shape. To master the influence laws of different cross-sectional shapes on bearing property of concrete-filled steel tubular arches, compression-bending tests were carried out on specimens with different cross sections using ANSYS, and the compression-bending bearing property of three different cross sections of specimens were statistically analyzed. The results show that: with the increasing of the eccentricity, the axial compression bearing capacity reduced and the bending bearing capacity increased. The circular specimens have the best compression-bending bearing property, whose ultimate moment was 1.3 times, 1.65 times and 2.8 times as large as the tested members with square, circular, D shape, and reverse D shape, respectively; and the envelope area of M-N curve was 1.44 times, 1.83 times and 2.75 times as large as the above three shapes, respectively. The cross section forms had much more significant effects on the bending capacity than compressive capacity. Compression-bending bearing property of D shape was affected obviously by bias direction, and which was lower in reverse bending.