How are cracked sections analyzed in SAFE?

Answer: Two types of cracked-section analysis are available, including:

 

Cracked-section analysis is run in SAFE using either of the following two methods:

  1. All load patterns are applied in a single load case which uses either immediate or long-term cracked deflection, discussed as follows:

    Immediate cracked deflection, in which all loads (DEAD + SDEAD + LIVE) are applied in a single load pattern, then analysis is run with the Crack Analysis option.

    Long-term cracked deflection, in which analysis is divided into the following two categories:

  2. A single load pattern is applied in a load case, then another case is set to continue From State at End of Nonlinear Case.

    For example:

Cracked-slab deflection

SAFE can use user-defined reinforcement to compute cracked-slab deflection. For this option, select Run > Reinforcing Option for Cracking Analysis, then select User Specified Rebars in Reinforcement Source. Select Draw Slab Rebar from the vertical menu on the left. Note that rebar must be added in both the tension and compression regions for the entire slab since the software will only use the user-defined reinforcement, and not use the reinforcement design.

Related Incident:

References

Refer to watch and learn video: Cracked section analysis

During nonlinear cracked-section analysis, SAFE estimates deflection using a moment-rotation curve as described in the reference which follows:

Related Incident:

See Also