Stability of Large-Size and High-Strength Steel Angle Sections Affected by Support Constraint
- PDF / 3,987,692 Bytes
- 15 Pages / 595.276 x 790.866 pts Page_size
- 18 Downloads / 147 Views
International Journal of Steel Structures https://doi.org/10.1007/s13296-020-00419-0
Stability of Large‑Size and High‑Strength Steel Angle Sections Affected by Support Constraint Yun Sun1 · Yaojie Guo1 · Haoyuan Chen1 · Ke Cao1 Received: 27 January 2020 / Accepted: 21 September 2020 © Korean Society of Steel Construction 2020
Abstract The influence of support stiffness on the effective calculated length which plays an essential role in the axial compression stability of steel memeber is always ignored due to the ideal support constraint that is difficult to achieve in the test. In this paper, the calculation method of the effective length factor was put forward by the mechanical model of the axially compressed member. The supports rotation stiffness of large-size and high-strength steel angle sections (LHS) under the test condition were measured, and the effective length of each specimen was modified. And 36 LHS members were tested under axial load. Then the stability responses for LHS members were studied using finite element analysis considering more section profiles and the wide range slenderness ratios. Moreover, the buckling strengths were compared with the current design codes. The results show that the support constraint has a significant influence on the bearing capacity of the LHS member. Considering the influence of support restraint, when the slenderness ratio is small, the stability factor is higher than the column curve in current codes; when the slenderness ratio is large, b-curves in both GB50017-2017 and Eurocode 3 are conservative, whereas other codes are marginally unsafe. Finally, a new column curve was proposed to predict LHS members’ capacity more accurately. Keywords Large-size and high-strength steel angle sections · Experimental study · Finite element analysis · Rotation stiffness · Effective length factor · Bearing capacity
1 Introduction Large-size and high-strength steel angle sections (LHS, limb width ≥ 220 mm, limb thickness ≥ 16 mm and yield strength ≥ 420 MPa) members have been widely applied in high-voltage and ultra-high-voltage transmission tower projects due to their excellent integrity, easy manufacturing, and high bearing capacity (Du 2011; Zhang et al. 2016). Compared with regular section and regular strength angle steel (RRS, limb width
Data Loading...
