Define project criteria for specification compliance checking of prestressed elements.

The parameters on this tab are stress limits. They can be set to match or deviate from AASHTO.

Stress Limits for Temporary Stresses before Losses (LRFD 5.9.2.3.1 (pre-2017: 5.9.4.1) )

The information in this section allows you to deviate from LRFD 5.9.2.3.1.

Item	Description
Compressive Stress	Enter the coefficient for the compressive stress limit.
Tensile Stress - In areas other than the precompressed tensile zone and without bonded reinforcement	Enter the coefficient for the tensile stress limit. Check the "But not greater than" box to estabilish an upper limit on the tensile stress limit.
Tensile Stress - In areas with sufficient bonded reinforcement	Enter the coefficient for the tensile stress limit.

‍NOTE: See Longitudinal Reinforcement in the Technical Guide for discussion describing how longitudinal reinforcement in the girder factors into the determination of the tensile stress limit.

Stress Limits at Service Limit States after Losses (LRFD 5.9.2.3.2 (pre-2017: 5.9.4.2))

The information in this section allows you to deviate from LRFD 5.9.2.3.2

Item	Description
Compressive Stress (Effective Prestress + Permanent Loads)	Enter the coefficient for the compressive stress limit.
Compressive Stress (Effective Prestress + Permanent Loads + Transient Loads)	Enter the coefficient for the compressive stress limit.
Tensile Stress (Service I)(Effective Prestress + Permanent Loads, Final Stress without Live Load)	Enabling this option provides unique tension stress limits for intermeidate load stages of spliced girders and checks the final girder stress condition without live load. The Service I limit state combination is used for these checks. See notes 1 and 2 below. Enter the coefficient for the tensile stress limit. Check the "But not greater than" box to establish an upper limit on the tensile stress limit.
Tensile Stress (Service III)(Effective Prestress + Permanent Loads + Transient Loads)	Enter the coefficient for the tensile stress limit for "Not worse than moderate corrosion conditions" and "Severe corrosive conditions". Check the "But not greater than" box to establish an upper limit on the tensile stress limit. See note 3 and 4 below.

‍NOTE 1: Service I Tensile Stress, Final Stress without Live Load - Some bridge owners limit the girder tensile stress for final tension without live load, however, this is not an AASHTO requirement.

‍NOTE 2: Service I Tensile stress, Effecitve Prestress + Permanent Loads - AASHTO LRFD 5.12.3.4.3 requires stress limits be evaluated at intermediate loading stages with the stress limits from AASHTO LRFD 5.9.2.3.2. Table 5.9.2.3.2b-1 provides the stress limits for normal and severe corrosive conditions. Some bridge owners limit these final tensile stresses with live load in the Service III limit state to 0 ksi but do not reduce the stress limit for intermediate loading stages. If the final tensile stress limit is 0 ksi and this option is enabled, the tension limit defined by this option will be used for all analysis intervals before live load is present.

‍NOTE 3: This tensile stress limit provide an override option for LRFD Table 5.9.2.3.2b-1. LRFD 5.12.3.4.3 requires this stress limits to be applied to intermediate loading stages. However, some owners restrict the final Service III tension stress to 0 ksi but do not restrict the tension limit for intermediate stages. If this limit is set to 0 ksi and the Service I, Final Stress without Live Load option is enabled, the tensile stress limit for the Final Stress without Live Load will be used, otherwise this limit will be used.

‍NOTE 4: The corrosion condition is defined in the Environmental parameters of a project.

Allowable Concrete Stress at Fatigue Limit State (LRFD 5.5.3.1)

The information in this section allows you to deviate from LRFD 5.5.3.1.

Item	Description
Fatigue I plus one-half the sum of effective prestress and permanent loads	Enter the coefficient for the compressive stress limit.

Stress Limits for Temporary Loading Conditions (PGSuper Only)

Some bridge owners limit the girder stresses during intermediate, temporary loading conditions. These parameters are only used for PGSuper projects.

‍NOTE: The LRFD specifications require evaluation of stresses during temporary loading conditions for spliced girder bridges. The stress limitations are based on LRFD 5.9.2.3.1 and 5.9.2.3.2 (pre-2017: 5.9.4.1 and 5.9.4.2). Therefore, PGSplice does not use these limitations.

Check the "Evaluate stress limits for temporary loading conditions" to cause stress to be evaluated immediately after temporary strand removal and immediately after deck placement.

Stress Limits immediately after Temporary Strand Removal

Parameters for evaluating girder stresses immediately after temporary strands are removed.

Item	Description
Compressive Stress	Enter the coefficient for the compressive stress limit
Tensile stress - In areas other than the precompressed tensile zone	Enter the coefficient for the tensile stress limit. Check the "But not greater than" box to establish an upper limit on the tensile stress limit.
Tensile stress - In areas with sufficient bonded reinforcement	Enter the coefficient for the tensile stress limit.

‍NOTE: See Longitudinal Reinforcement in the Technical Guide for discussion describing how longitudinal reinforcement in the girder factors into the determination of the tensile stress limit.

Stress Limits immediately after Deck Placement

Parameters for evaluating girder stresses immediately after deck placement.

Item	Description
Compressive Stress	Enter the coefficient for the compressive stress limit
Tensile stress	Enter the coefficient for the tensile stress limit. Check the "But not greater than" box to establish an upper limit on the tensile stress limit.

Principal Tensile Stress in Webs (LRFD 5.9.2.3.3)

These requirements were first introduced in the AASHTO LRFD Bridge Design Specifications, 8th Edition 2017. See Principal Tensile Stress in Webs in the Technical Guide for more information.

Item	Description
Tensile Stress	Enter the coefficient for the tensile stress limit.
Check when f'c exceeds	Principal web stress requirements will be checked in PGSuper when f'c is greater than or equal to the input value, or if the keyword "All" is entered. Note that post tensioned spliced girders will always be checked.
Compute flexural shear stress...	Select the method for computing flexural shear stress in the webs. Options are AASHTO LRFD Equation 5.9.2.3.3-1 and WSDOT BDM/NCHRP Report 849 Equation 3.8. The AASHTO equation computes the shear stress by applying the Service III shear force to the composite section. For simplified loss methods, the WSDOT/NCHRP equation computes shear stress by applying loading to the non-composite and composite sections as appropriate and summing the resulting stresses. For time-step loss methods, the WSDOT/NCHRP method computes incremental shear and axial stresses from the incremental load response and transformed section properties at each time interval, and then summs the stresses over time.
At sections where internal tendons cross...	Enter the number of outside duct diameters away from the centerline of a duct used to determine of the tendon is "near" the section being checked and the web width reduction provisions of LRFD 5.7.2.1 are applied. When nearby, web widths are reduced by the input factor * duct diameter for grouted and ungrouted conditions.