Strength Reduction / Resistance / Partial Safety Factors

Enter the strength reduction factors, which are a form of safety factors to account for the difference between the nominal and real strengths of the materials; the difference in member strengths between the design and manufacturing or construction; uncertainties related to inaccuracies in the design equations; and the ductility and importance of the member.

From the Main Menu select Design > Concrete Design Parameter > Strength Reduction / Resistance / Partial Safety Factors.

From the Menu tab of the Tree Menu select Design > Concrete Design Parameter > Strength Reduction / Resistance / Partial Safety Factors.

The following dialog box is used to enter the data:

Strength Reduction Factors dialog box (ACI318-02)

 

 

Current Design Code

Display the selected design code.

 

Strength Reduction Factors (refer to Note)

Enter the strength reduction factor in each field.

For Flexure (phi_b): Strength reduction factor for pure flexure or flexure + axial tension

For Axial Tension with Flexure (phi_t): Strength reduction factor for axial tension

For Axial Compression, and Axial Compression with Flexure

- Member with Spiral Reinforcement (phi_c1): Strength reduction factor for spirally reinforced columns subjected to axial compression or flexure + axial compression

- Other Reinforced Member (phi_c2): Strength reduction factor for tied columns subjected to axial compression or flexure + axial compression

For Shear (phi_v): Strength reduction factor for shear

 

Resistance Factors dialog box (CSA-A23.3-94)

 

 

Partial Safety Factors for Strength of Materials dialog box (BS8110-97)

 

 

Partial Safety Factors for Material Properties dialog box (Eurocode2)

Partial Safety Factors for Material Strength dialog box (IS 456:2000)

Strength Reduction Factors dialog box (TWN-USD92)

 : Enter the values and close the dialog box.

 : Do not apply the entered values and close the dialog box.

 

Note
When the strength reduction factors are not entered, the strength reduction factors specified in the current design code are used.