LARSA 4D Introductory Training Manual for Bridge ... - LARSA, Inc.

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LARSA 4D Introductory Training Manual for Bridge Projects Close the spreadsheet. Setting Construction Days Open the Construction Stages Explorer and note how it has been updated with the new stage data at the bottom. These stages do not need construction steps because the only activities within these stages are automatically created by the analysis engine. Next we prepare to run the analysis. Running the Analysis Go to Analysis → Staged Construction Analysis . Choose the Time-Dependent analysis type. Open the Construction Stages options tab, and set Ending Construction Stage to the last stage, Day 1800: Five Years. Click Analyze . Staged Construction Analysis Options Close the analysis window when it finishes without errors. 50
LARSA 4D Introductory Training Manual for Bridge Projects Results In a Time-Dependent Staged Construction Analysis, new result cases are automatically generated in each stage for the effects of creep, shrinkage, relaxation, and other losses. Time-Dependent Result Cases Step through deformed model graphical diagrams at a scale factor of 256 from the first result case to the last to see the effects of the time-dependent material properties. If not all of the elements appear deformed, ensure they are selected (use Select All ) and that the correct stage is selected in the Construction Stages Explorer (use the View Full Model button in the explorer if necessary). The deformations over time are of course also available in the spreadsheets. We can also make a displacement-over-time graph. Go to Results → Graphs . Change Data Set to “Construction Stages” Change the X-Axis type to Days. Change the Y-Axis result to Joint Displacements and Translation Z and set the Joint number to 10, which is the midpoint of the first span. Click Update at the top of the window to draw the graph. The graph shows that as a result of time, the joint is displacing downward more and more. The graph shows a stepping function because of the way material time effects are evaluated in each stage. The effects of creep, shrinkage, and other effects are assessed separately within the same day of construction. Each has a small but instantaneous effect, resulting in several steps straight down. 51
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LARSA 4D Introductory Training Manual for Bridge ... - LARSA, Inc.

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