Research Article
Optimization for U-Shaped Steel Support in Deep Tunnels under Coupled Static-Dynamic Loading
Table 2
The chemical composition, geometric parameters, and mechanical properties of U-shaped steel.
| | Chemical composition | C | Si | Mn | ALt | P | S | | 0.21∼0.31 | 0.2∼0.6 | 1.20∼1.60 | ≥0.015 | ≤0.045 | ≤0.045 |
| | Geometric parameters | Sectional area (cm2) | Weight (kg·m−1) | Moment of inertia (cm4) | Inertial radius (cm) | Sectional modulus (cm3) | Static moment (cm) | | IX | IY | Ix | Iy | WX | WY | Sx | | 31.79 | 24.95 | 495.8 | 551.9 | 3.95 | 4.17 | 83.1 | 81.77 | 197.5 |
| | Mechanical properties | Tensile strength (MPa) | Yield strength (MPa) | Elongation at break (%) | Bending test (D = diameter (mm); A = sample thickness (mm)) | | | Shear strength (MPa) | Young’s modulus (GPa) | Poisson’s ratio | | 530 | 335 | 20 | D = 3A | | | 318 | 206 | 0.3 |
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