GB 50017-2017
The GB 50017-2017 standard adopts as the material parameter the steel design compressive, tension, and bending strength f and shear strength fy. If this value is not determined for the used steel directly, it is back calculated from the steel yield stress fy as:
where: | γR | - | resistance sub coefficient, which is 1,087 for fy ≤ 240 MPa and 1,111 for fy > 240 MPa |
Check for bending with the influence of normal force
The bending stress with the influence of normal force is checked according to this expression:
where: | A | - | area of cross-section |
W | - | elastic modulus of cross-section | |
γx | - | section plasticity develop factor | |
f | - | design strength of steel |
Section plasticity develop factor γx depends on shape of cross section. For I-sections, sheet piles and casing is considered as γx = 1,05. The value of utilization is provided by:
Check for shear
The shear stress τ is checked based on the following expression:
and the value of utilization is provided by:
State of plane stress verification
The state of plane stress is checked exploiting the following conditions:
where: | σ1 | - | normal stress |
τ1 | - | shear stress in the verified section | |
β1 | - | strength design value increase coefficient, which is 1,1 |
The value of utilization is provided by:
