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Follow the next steps to prepare the set of unfactored analysis results. |
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Under Combinations, go to Result Extraction Cases.
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Go to 1st row, name it as DC1.
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Go to the second column Filter by Load Type, click three-dots icon and select Dead.
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Go to the 3rd column Envelope, click three-dots icon and select NO.
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Go to the 4th column Incremental, click three-dots icon and select NO.
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Go to the 5th column Extreme Effects, click three-dots icon and select NO.
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Go to Cases|Factors, click three-dots icon to open edit window.
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In the new spreadsheet, click Select under Case cell.
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From the drop-down menu, select dead loads of the construction one-by-one.
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| title | More about Result Extraction Cases |
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The first key parameter of this step is the Load Type specified in the Loading/Construction Stage.
Load Type serves as a filter when analysis results are extracted through construction stages (by Filter by Load Type parameter of Result Extraction Cases).
Filter by Load Type enables extracting analysis results based on load types, either cumulative or incremental.
To extract cumulative or incremental other two key parameters are:
i) Envelope:
ii)Incremental:
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YES
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Selecting YES (ex: )
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NO
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Selecting NO
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Envelope
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Extracts the most critical results of Cases|Factors when it contains more than one load case.
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Finds the most critical results like deck pouring sequences, wind load, temperature load cases.
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Extracts the results of Cases|Factors when it contains only one load case.
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-
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YES
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Selecting YES (ex: )
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NO
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Selecting NO (ex: )
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Incremental
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Extracts incremental results of each stage added to Cases|Factors.
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Obtains incremental results of a specific load type included in stages added to Cases|Factors.
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Extracts cumulative results up to the last stage added to Cases|Factors.
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Obtains cumulative results of a specific load type included in stages added to Cases|Factors(Ex: Assume the load type of barrier loading is specified as Superimposed - Assume the load type of girder erection and deck pouring sequences is Dead. Using Incremental = NO and Filter by Load Type = Superimposed gives the results of barrier loading).
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Go to Result Extraction Cases under Combinations on the tree view.
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Copy Items from model inputs and paste into OpenBrIM.
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Completed input spreadsheet is illustrated below. |
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Follow the next steps to import load factors from pre-defined OpenBrIM Library definitions. |
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Go to Combinations/Design Load Combinations/Load Combination Table. This is the interface of load factors of limit states to be imported.
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Follow the next steps to add load combinations for superstructure. |
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In Load Combination Table input spreadsheet, go to 1st row of Strength I column and click on three-dots icon.
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Select Import.
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Keep Source drop-down menu as default (OpenBrIM Platform ()).
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Select Database from drop-down menu as AASHTO 9th Edition Load Combinations.
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Select Category as Strength Limit States.
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Select Asset as Strength I.
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Scroll down in the Import OBPAASHTOLimitState menu and click Import.
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In same way, repeat the same procedure to import the other corresponding limit states (Strength III, Strength IV, Strength V, Service II, Fatigue I and Fatigue II).
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Name the Load Combination Table as SuperstructureLCT.
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Imported limit states appears under Combinations/Design Load Combinations/Limit States.
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Follow the next steps to add load combinations for substructure. |
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Go back to Combinations/Design Load Combinations/Load Combinations tab.
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Create one more row and name it as SubstructureLCT. Import the limit states (StrengthI, StrengthIII, StrengthIV, StrengthV, ServiceI, ServiceII, ServiceIII, ServiceIV, FatigueI and FatigueII) in same way with the previous step.
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Additonal limit states imported are appeared in Combinations/Design Load Combinations/Limit States spreadsheet.
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| Expand | ||
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Unfactored set of analysis results extracted from the construction stages. Load factors from limit states. |
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Follow the next steps to specify the load cases (classes) combined with the load factors. |
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Go to Combinations/Design Load Combinations/Limit States one last time and select Load Cases 1.
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-20221009-085252.png?version=1&modificationDate=1668016704811&cacheVersion=1&api=v2)
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Click on three-dots icon under DC1 column of StrengthI limit state and click Select.
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Select DC1 (Remember, its content was composed of the corresponding construction stages in Combinations/Result Extraction Cases step).
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In same way, keep selecting the load cases for the corresponding limit states.
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Load cases not included in this example should remain as NULL.
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Serviceability limit states (Strength, Service, and Fatigue) and load combinations are completed. |
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Follow the next steps to include a unique load combination for the constructability limit state. |
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Under Combinations/Design Load Combinations/Limit States, add a row named StrIConst.
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Select DC1 and keep the rest of the load cases as NULL.
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Enter γmax as 1.4.
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Go to Combinations/Design Load Combinations/Load Combination Table one last time.
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Add a row named SuperStrConstLCT.
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Select StrengthI column as StrIConst, and keep the rest of the limit states as NULL.
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Analysis loads & combinations of the code checks are completed. |
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Follow the next steps to create a Load Combination Table for load rating. |
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Go to Combinations/Design Load Combinations/Load Rating Combination Table.
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Under Dead Load column, select DC1, DC2 and DW accordingly, and specify load factors as 1.25 and 1.5, respectively.
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Name the row as LoadRatingLCT.
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Dead load definitions are completed. |
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Follow the next steps to add live load definitions. |
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Switch to Design Load column.
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Click three-dots icon under LL column and select a live load case.
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Legal Load, Emergency Load and Permit Load could be defined similarly with corresponding live load cases with desired vehicle definitions and load factors.
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Go to Limit States under Design Load Combinations on the tree view.
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Copy Load Modifiers, Load Cases 1, Load Cases 2, and Load Cases 3 from model inputs and paste into OpenBrIM.
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Go to Load Combination Table under Design Load Combinations on the tree view.
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Copy Params from model inputs and paste into OpenBrIM.
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Go to Load Rating Combination Table under Design Load Combinations on the tree view.
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Copy Dead Load, Design Load, Legal Load, Emergency Load, and Permit Load from model inputs and paste into OpenBrIM.
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Result Extraction Cases
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Items
| Code Block |
|---|
DC1 Dead YES NO NO [[SubstrConstStage, 1],[GirderStage, 1],[SIPFormworkStage, 1],[Cast1PourStage, 1],[Cast2PourStage, 1],[Cast3PourStage, 1],[Cast123GainStiffStage, 1],[Cast4PourStage, 1],[Cast5PourStage, 1],[Cast45GainStiffStage, 1]]
DC2 Imposed Dead NO NO NO [[FBarrierStage, 1]]
DW Wearing Surface NO NO NO [[FutureWearingStage, 1]]
LL Live (Vehicular + Impact) YES YES NO [[LLHL93Case, 1]]
LLFat Live (Vehicular + Impact) YES YES NO [[LLFatCase, 1]]
WS Wind on Structure YES YES NO [[WSCase, 1]]
TU Temperature YES YES NO [[TUExpStage, 1],[TUContrStage, 1]]
BR Braking NO NO NO [[LLBrakingCase, 1]]
CENT Centrifugal NO NO NO [[LLCentCase, 1]] |
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Limit States
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Load Modifiers
| Code Block |
|---|
StrengthI 1 1 1
StrengthIII 1 1 1
StrengthV 1 1 1
ServiceI 1 1 1
ServiceII 1 1 1
FatigueI 1 1 1
FatigueII 1 1 1
StrengthII 1 1 1
StrengthIV 1 1 1
ServiceIII 1 1 1
ServiceIV 1 1 1
StrIConst 1 1 1 |
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Load Cases 1
| Code Block |
|---|
StrengthI DC1 1.25 0.9 DC2 1.25 0.9 DW 1.5 0.65 LL 1.75 1.75 BR 1.75 1.75 WS 0 0 NULL 0 0 TU 1.2 0.5 CENT 1.75 1.75 NULL 1 1
StrengthIII DC1 1.25 0.9 DC2 1.25 0.9 DW 1.5 0.65 LL 0 0 BR 0 0 WS 1 1 NULL 0 0 TU 1.2 0.5 CENT 0 0 NULL 1 1
StrengthV DC1 1.25 0.9 DC2 1.25 0.9 DW 1.5 0.65 LL 1.35 1.35 BR 1.35 1.35 WS 1 1 NULL 1 1 TU 1.2 0.5 CENT 1.35 1.35 NULL 1 1
ServiceI DC1 1 1 DC2 1 1 DW 1 1 LL 1 1 BR 1 1 WS 1 1 NULL 1 1 TU 1.2 0.5 CENT 1 1 NULL 1 1
ServiceII DC1 1 1 DC2 1 1 DW 1 1 LL 1.3 1.3 BR 1.3 1.3 WS 0 0 NULL 0 0 TU 1.2 0.5 CENT 1.3 1.3 NULL 1 1
FatigueI DC1 0 0 DC2 0 0 DW 0 0 LLFat 1.75 1.75 BR 1.75 1.75 WS 0 0 NULL 0 0 TU 0 0 CENT 1.75 1.75 NULL 1 1
FatigueII DC1 0 0 DC2 0 0 DW 0 0 LLFat 0.8 0.8 BR 0.8 0.8 WS 0 0 NULL 0 0 TU 0 0 CENT 0.8 0.8 NULL 1 1
StrengthII DC1 1.25 0.9 DC2 1.25 0.9 DW 1.5 0.65 LL 1.35 1.35 BR 1.35 1.35 WS 0 0 NULL 0 0 TU 1.2 0.5 CENT 1.35 1.35 NULL 1 1
StrengthIV DC1 1.5 0.9 DC2 1.5 0.9 DW 1.5 0.65 LL 0 0 BR 0 0 WS 0 0 NULL 0 0 TU 1.2 0.5 CENT 0 0 NULL 1 1
ServiceIII DC1 1 1 DC2 1 1 DW 1 1 LL 1 1 BR 1 1 WS 0 0 NULL 0 0 TU 1.2 0.5 CENT 1 1 NULL 1 1
ServiceIV DC1 1 1 DC2 1 1 DW 1 1 LL 0 0 BR 0 0 WS 1 1 NULL 0 0 TU 1.2 0.5 CENT 0 0 NULL 1 1
StrIConst DC1 1.4 1 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 1 1 |
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Load Cases 2
| Code Block |
|---|
StrengthI 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 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 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 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 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
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
StrengthII 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
StrengthIV 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
ServiceIII 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 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
StrIConst 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 1 1 NULL 1 1 |
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Load Cases 3
| Code Block |
|---|
StrengthI 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 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 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 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 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
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
StrengthII 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
StrengthIV 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
ServiceIII 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 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
StrIConst 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 1 1 |
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| Info |
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After clicking on ‘Combinations> Design Load Combinations> Load Combination Table' in the navigation treeview, follow the steps to define the Load Combination Table. You can use the collapsed documentation page below for more information on the explanations of each parameter. |
| Expand | ||
|---|---|---|
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| Load Combination Table [SIG] |
| 1 | 🖱️ Click on Name cell and set name as SuperstructureLCT. |  | ||||||||||
| 2 | 🖱️ Click three-dots icon on Strength I cell and select a Limit State as StrengthI. If you have reached this stage and you don't have a limit state to select, and if you want to use the Import Button, you can refer to the Quick Tip. |    | ||||||||||
| 3 |
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| 4 | To model all the load combination table, copy the data below and paste the parameters into the first cell in OpenBrIM spreadsheet. Refer to the quick tip for an easy guide on how to perform the copy operation. After completing the copy, proceed to the next step to verify the model. | |||||||||||
| Insert excerpt | ||||||||
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Load Combination Table | ||
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Params
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Load Rating Combination Table
Dead Load
| Code Block |
|---|
LoadRatingLCT 1.25 DC1 DC2 1.5 DW |
Design Load
| Code Block |
|---|
LoadRatingLCT 1.35 1.35 LL |
Legal Load
| Code Block |
|---|
LoadRatingLCT 1 LL 1 NULL 1 NULL 1 NULL 1 NULL 1 NULL 1 NULL 1 NULL 1 NULL 1 NULL |
Emergency Load
| Code Block |
|---|
LoadRatingLCT 1 LL 1 NULL 1 NULL 1 NULL 1 NULL 1 NULL 1 NULL 1 NULL 1 NULL 1 NULL |
Permit Load
| Anchor | ||||
|---|---|---|---|---|
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| Tip |
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The completed load combination tables are illustrated below. Please verify that you have the same model on your end by examining each view provided here. For more information on how to perform visual checks, refer to the quick tips. |
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| Tip |
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To view the entire procedure explained on this page, please watch the recorded Video below. |
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