Principal Stress at Construction Stage

Check the principal stresses at construction stage for which they are maximum, in a spreadsheet format table.

Table Tool in midas Civil offers a variety of powerful built-in functions. Refer to Usage of Table Tool for detail directions.

Note

Sign convention for principal stress: Negative for Tension, Positive for Compression

From the Main Menu select PSC > PSC Design Result Table > Principal Stress at Construction Stage

Upon executing the PSC Design Result Table > Principal Stress at Construction Stage, Records Activation Dialog prompts. Click after selecting the output entities such as elements, part number, Comp./Tens. Stress.

Refer to Usage of Table Tool and check the following data:

Elem: Element number

Part: Check location (I-End, J-End) of each element

Comp./Tens.: Compression or Tension Stress

Stage: Construction stage

CHK: Principal stress check for construction stages

Sig_P1: Principal Stress at the left top of top flange.

Sig_P2: Principal Stress at the right top of top flange.

Sig_P3: Principal Stress at the right bottom of bottom flange.

Sig_P4: Principal Stress at the left bottom of bottom flange.

Sig_P5: Principal Stress at the top of left web.(at Z1 Level)

Sig_P6: Principal Stress at the top of right web.(at Z1 Level)

Sig_P7: Principal Stress at the neutral axis in left web.(at Z2 Level)

Sig_P8: Principal Stress at the neutral axis in right web.(at Z2 Level)

Sig_P9: Principal Stress at the bottom of left web.(at Z3 Level)

Sig_P10: Principal Stress at the bottom of right web.(at Z3 Level)

Sig_MAX: The maximum Principal stress among P1-P10.

Sig_AP: Allowable principal stress at neutral axis in the web.

Note 1. Allowable tensile principal stress limit for AASHTO LRFD (2012) and CSA-S6S1-2010

Principal tensile stress at neutral axis in web is determined based on the clause 5.9.4.1.2 of AASHTO LRFD (2012).  

Principal tensile stress limit = (ksi)

Where, f’ci is specified compressive strength of concrete at time of initial loading  or precompressing; nominal concrete strength at time of application of tendon.

midas Civil computes the compressive strength of concrete (f’ci) during the construction stages according to the construction days defined in Define Construction Stage function and Time Dependent Material (Comp. Strength). If f'ci exceeds the specified compressive strength, f'c, the value of f'ci will be replaced into the value of f'c.