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Limit States [EX1-STG]

Limit States [EX1-STG]

Owned by mert.goktas (Unlicensed)
Last updated: Mar 26, 2023
10 min read

Please follow the instructions provided below to define the load cases (classes) combined with the load factors.

1

This section defines unfactored cases for result extraction, which are mapped as DC, DW, LL, and WL in accordance with AASHTO specifications. If the Strength 1 limit state factors vary between the superstructure and substructure, two Strength 1 limit state cases can be specified here with different factors. Furthermore, different DOT amendments may supersede these factors, and users can modify them as needed within this section.

2

 

 

Strength
Service
3
4

Navigate to Combinations > Design Load Combinations > Limit States

5

Click three-dots icon on Name cell and click Import OBPAASHTOLimitState.

6

To import the "AASHTO 9th Edition Load Combination" data from the OpenBrIM Library to your project, select it from the options available in the combobox.

At this stage, you are tasked with defining 18 load cases, which are categorized into the following groups:

 

 

7

For Substructure:

  • StrengthI_sub

  • StrengthIII_sub

  • StrengthV_sub

  • ServiceI_sub

  • ServiceII_sub

  • ServiceIII_sub

  • ServiceIV_sub

For Superstructure:

  • StrengthI_sup

  • StrengthIII_sup

  • StrengthV_sup

  • ServiceI_sup

  • ServiceII_sup

  • StrengthIV_sup

For Constructibility

  • StrengthI_cons

  • StrengthIII_cons

  • StrengthV_cons

For Fatigue:

  • FatigueI

  • FatigueII

8

Navigate to Load Cases 1 tab.

Assign the unfactored result cases defined in the previous step to DC1(Noncomposite Dead Load)

 

 

 

9

Click three-dots icon on DC1 (Noncomposite Dead Load) cell and click Select.

Select DC1_Sub result extraction cases for “StrengthI_sub” as in the figure

Then enter γmax & γmin data.

10

In order to set DC1 for all limit states, you can click and drag the fill handle (the small square in the lower-right corner of the selected cell)

11

In same way, keep selecting the result cases for different load types

 

12

Load types not included in this example should remain as NULL.

1

Go to Limit States under Design Load Combinations on the tree view.

2

Copy Load Modifiers, Load Cases 1, Load Cases 2, and Load Cases 3 from model inputs and paste into OpenBrIM.

 

Limit States

Limit States

Load Modifiers

Load Cases 1

Load Cases 2

Load Cases 3

StrengthI_sub 1 1 1 StrengthIII_sub 1 1 1 StrengthV_sub 1 1 1 ServiceI_sub 1 1 1 ServiceII_sub 1 1 1 StrengthI_sup 1 1 1 StrengthIII_sup 1 1 1 StrengthV_sup 1 1 1 ServiceI_sup 1 1 1 ServiceII_sup 1 1 1 StrengthI_cons 1 1 1 StrengthIII_cons 1 1 1 StrengthV_cons 1 1 1 FatigueI 1 1 1 FatigueII 1 1 1 ServiceIII_sub 1 1 1 ServiceIV_sub 1 1 1 StrengthIV_sup 1 1 1
StrengthI_sub DC1_Sub 1.25 0.9 DC2 1.25 0.9 DW 1.5 0.65 LLSub 1.75 1.75 BR 1.75 1.75 NULL 0 0 NULL 0 0 TU 0.5 0.5 Cent 1.75 1.75 NULL 1 1 StrengthIII_sub DC1_Sub 1.25 0.9 DC2 1.25 0.9 DW 1.5 0.65 LLSub 0 0 BR 0 0 AASHTO Wind Cases Strength III 1 1 NULL 0 0 TU 0.5 0.5 Cent 0 0 NULL 1 1 StrengthV_sub DC1_Sub 1.25 0.9 DC2 1.25 0.9 DW 1.5 0.65 LLSub 1.35 1.35 BR 1.35 1.35 AASHTO Wind Cases Strength V 1 1 NULL 1 1 TU 0.5 0.5 Cent 1.35 1.35 NULL 1 1 ServiceI_sub DC1_Sub 1 1 DC2 1 1 DW 1 1 LLSub 1 1 BR 1 1 AASHTO Wind Cases Service I 1 1 NULL 1 1 TU 0.5 0.5 Cent 1 1 NULL 1 1 ServiceII_sub DC1_Sub 1 1 DC2 1 1 DW 1 1 LLSub 1.3 1.3 BR 1.3 1.3 NULL 0 0 NULL 0 0 TU 0.5 0.5 Cent 1.3 1.3 NULL 1 1 StrengthI_sup DC1_Sup 1.25 0.9 DC2 1.25 0.9 DW 1.5 0.65 LL 1.75 1.75 BR 1.75 1.75 NULL 0 0 NULL 0 0 TU 0.5 0.5 Cent 1.75 1.75 NULL 1 1 StrengthIII_sup DC1_Sup 1.25 0.9 DC2 1.25 0.9 DW 1.5 0.65 LL 0 0 BR 0 0 AASHTO Wind Cases Strength III 1 1 NULL 0 0 TU 0.5 0.5 Cent 0 0 NULL 1 1 StrengthV_sup DC1_Sup 1.25 0.9 DC2 1.25 0.9 DW 1.5 0.65 LL 1.35 1.35 BR 1.35 1.35 AASHTO Wind Cases Strength V 1 1 NULL 1 1 TU 0.5 0.5 Cent 1.35 1.35 NULL 1 1 ServiceI_sup DC1_Sup 1 1 DC2 1 1 DW 1 1 LL 1 1 BR 1 1 AASHTO Wind Cases Service I 1 1 NULL 1 1 TU 0.5 0.5 Cent 1 1 NULL 1 1 ServiceII_sup DC1_Sup 1 1 DC2 1 1 DW 1 1 LL 1.3 1.3 BR 1.3 1.3 NULL 0 0 NULL 0 0 TU 0.5 0.5 Cent 1.3 1.3 NULL 1 1 StrengthI_cons DC1_Sup 1.4 0.9 NULL 1.25 0.9 NULL 1.5 0.65 NULL 1.75 1.75 NULL 1.75 1.75 NULL 0 0 NULL 0 0 NULL 0.5 0.5 NULL 1.75 1.75 NULL 1 1 StrengthIII_cons DC1_Sup 1.25 0.9 NULL 1.25 0.9 NULL 1.5 0.65 NULL 0 0 NULL 0 0 NULL 1 1 NULL 0 0 NULL 0.5 0.5 NULL 0 0 NULL 1 1 StrengthV_cons DC1_Sup 1.25 0.9 NULL 1.25 0.9 NULL 1.5 0.65 NULL 1.35 1.35 NULL 1.35 1.35 NULL 1 1 NULL 1 1 NULL 0.5 0.5 NULL 1.35 1.35 NULL 1 1 FatigueI DC1_Sup 0 0 DC2 0 0 DW 0 0 LLFat 1.75 1.75 BR 1.75 1.75 NULL 0 0 NULL 0 0 TU 0 0 Cent 1.75 1.75 NULL 1 1 FatigueII DC1_Sup 0 0 DC2 0 0 DW 0 0 LLFat 0.8 0.8 BR 0.8 0.8 NULL 0 0 NULL 0 0 TU 0 0 Cent 0.8 0.8 NULL 1 1 ServiceIII_sub DC1_Sub 1 1 DC2 1 1 DW 1 1 LLSub 1 1 BR 1 1 NULL 0 0 NULL 0 0 TU 0.5 0.5 Cent 1 1 NULL 1 1 ServiceIV_sub DC1_Sub 1 1 DC2 1 1 DW 1 1 LLSub 0 0 BR 0 0 AASHTO Wind Cases Service IV 1 1 NULL 0 0 TU 0.5 0.5 Cent 0 0 NULL 1 1 StrengthIV_sup DC1_Sup 1.5 0.9 DC2 1.5 0.9 DW 1.5 0.65 LL 0 0 BR 0 0 NULL 0 0 NULL 0 0 TU 0.5 0.5 Cent 0 0 NULL 1 1
StrengthI_sub NULL 1 1 NULL 1 1 NULL 1.75 1.75 NULL 0 0 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 1.75 1.75 StrengthIII_sub NULL 1 1 NULL 1 1 NULL 0 0 NULL 0 0 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 StrengthV_sub NULL 1 1 NULL 1 1 NULL 1.35 1.35 NULL 0 0 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 1.35 1.35 ServiceI_sub NULL 1.2 1 NULL 1 1 NULL 1 1 NULL 0.5 0.5 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 1 1 ServiceII_sub NULL 1 1 NULL 1 1 NULL 1.3 1.3 NULL 0.5 0.5 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 1.3 1.3 StrengthI_sup NULL 1 1 NULL 1 1 NULL 1.75 1.75 NULL 0 0 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 1.75 1.75 StrengthIII_sup NULL 1 1 NULL 1 1 NULL 0 0 NULL 0 0 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 StrengthV_sup NULL 1 1 NULL 1 1 NULL 1.35 1.35 NULL 0 0 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 1.35 1.35 ServiceI_sup NULL 1.2 1 NULL 1 1 NULL 1 1 NULL 0.5 0.5 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 1 1 ServiceII_sup NULL 1 1 NULL 1 1 NULL 1.3 1.3 NULL 0.5 0.5 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 1.3 1.3 StrengthI_cons NULL 1 1 NULL 1 1 NULL 1.75 1.75 NULL 0 0 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 1.75 1.75 StrengthIII_cons NULL 1 1 NULL 1 1 NULL 0 0 NULL 0 0 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 StrengthV_cons NULL 1 1 NULL 1 1 NULL 1.35 1.35 NULL 0 0 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 1.35 1.35 FatigueI NULL 0 0 NULL 0 0 NULL 1.75 1.75 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 1.75 1.75 FatigueII NULL 0 0 NULL 0 0 NULL 0.8 0.8 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0.8 0.8 ServiceIII_sub NULL 1 1 NULL 1 1 NULL 1 1 NULL 0.5 0.5 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 1 1 ServiceIV_sub NULL 1 1 NULL 1 1 NULL 0 0 NULL 1 1 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 StrengthIV_sup NULL 1 1 NULL 1 1 NULL 0 0 NULL 0 0 NULL 1 1 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0 NULL 0 0

 

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