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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

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4

Navigate to Combinations > Design Load Combinations > Limit States

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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:

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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)

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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

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12

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

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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.

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Limit States

Load Modifiers

Load Cases 1

Load Cases 2

Load Cases 3

Code Block
languagexml
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
Code Block
languagexml
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
Code Block
languagexml
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
Code Block
languagexml
StrengthI_sub	NULL	1	1	NULL	1.5	0.75	NULL	1.5	0.9	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1.4	0.25	NULL	1	1	NULL	0	0
StrengthIII_sub	NULL	1	1	NULL	1.5	0.75	NULL	1.5	0.9	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1.4	0.25	NULL	1	1	NULL	0	0
StrengthV_sub	NULL	1	1	NULL	1.5	0.75	NULL	1.5	0.9	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1.4	0.25	NULL	1	1	NULL	0	0
ServiceI_sub	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	0	0
ServiceII_sub	NULL	0	0	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	0	0
StrengthI_sup	NULL	1	1	NULL	1.5	0.75	NULL	1.5	0.9	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1.4	0.25	NULL	1	1	NULL	0	0
StrengthIII_sup	NULL	1	1	NULL	1.5	0.75	NULL	1.5	0.9	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1.4	0.25	NULL	1	1	NULL	0	0
StrengthV_sup	NULL	1	1	NULL	1.5	0.75	NULL	1.5	0.9	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1.4	0.25	NULL	1	1	NULL	0	0
ServiceI_sup	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	0	0
ServiceII_sup	NULL	0	0	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	0	0
StrengthI_cons	NULL	1	1	NULL	1.5	0.75	NULL	1.5	0.9	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1.4	0.25	NULL	1	1	NULL	0	0
StrengthIII_cons	NULL	1	1	NULL	1.5	0.75	NULL	1.5	0.9	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1.4	0.25	NULL	1	1	NULL	0	0
StrengthV_cons	NULL	1	1	NULL	1.5	0.75	NULL	1.5	0.9	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1.4	0.25	NULL	1	1	NULL	0	0
FatigueI	NULL	0	0	NULL	0	0	NULL	0	0	NULL	0	0	NULL	0	0	NULL	0	0	NULL	0	0	NULL	0	0	NULL	0	0
FatigueII	NULL	0	0	NULL	0	0	NULL	0	0	NULL	0	0	NULL	0	0	NULL	0	0	NULL	0	0	NULL	0	0	NULL	0	0
ServiceIII_sub	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	0	0
ServiceIV_sub	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1	1	NULL	0	0
StrengthIV_sup	NULL	1	1	NULL	1.5	0.75	NULL	1.5	0.9	NULL	1	1	NULL	1	1	NULL	1	1	NULL	1.4	0.25	NULL	1	1	NULL	0	0