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GB 50017-2003

The GB 50017-2003 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 fy240 MPa and 1,111 for fy > 240 MPa

Check for bending with influence of normal force

The bending stress with 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: