FCM bridge
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The Wizard automatically generates the model data of a bridge constructed by an FCM, Free Cantilever Method, by entering simple variables. The data include elements, boundary conditions, tendon placement, construction stages, etc. for a bridge composed of PSC (prestressed or post-tensioned Concrete) Box sections. Please refer to "Advanced Applications" for the analysis procedure and model data generation using the FCM Bridge Wizard. Note 1 Note 2 |
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From the Main Menu select Structure > Wizard > FCM Bridge |
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Select a Data Input Type. Type 1: Define PSC Box Section and tendon layout in conformity with the form provided by the Wizard. Type 2: The user defines PSC Box Section and tendon layout manually. The Section defined by the user can be recalled and thus, multi-Cell Section can be defined.
Define the materials, sections and overall configuration of a bridge in conjunction with the composition of segments to generate construction stages. Material (Girder): Material for girders Material (Pier): Material for piers Pier Section: Section shape for piers Note Stage Duration Number of Piers: Total number of piers (a twin pier is counted as one) Radius Convex: Convex curvature bulging to the general +ve direction of the Global Y-axis on Global X-Y plane starting from the GCS origin tangent to the Global X-axis Concave: Concave curvature bulging to the general -ve direction of the Global Y-axis on Global X-Y plane starting from the GCS origin tangent to the Global X-axis
P.T. B
The list of the same number of pier tables is automatically generated on the basis of the Number of Piers entered in the above dialog box. The following items can be specified after assigning the desired pier tables requiring data changes: Pier Table Type
K1, K2
A number of Key Seg's. relative to the number of piers are automatically generated and listed in the dialog box. Enter the following items after selecting theKey Segs. whose data are to be changed: Key Segment Length: Length of Key Seg. Left Straight Segment No: The number of prismatic (straight) segments to the left of the Key Seg. At least '1' is recommended for the Key Seg formwork. Right Straight Segment No: The number of prismatic (straight) segments to the right of the Key Seg. At least '1' is recommended for the Key Seg formwork.
H, C Note
The FSM zone is considered as one segment. In order to specify tendon anchor locations define the lengths of the elements. The FSM zones are conventionally constructed with full shoring (FSM, Full Staging Method). Note
Specify the lengths of the segments in the buttress span (Zone 1) and the interior span (Zone2). Enter the lengths from the closest to the Pier table to the farthest from the Pier Table.
The dialog box displays the auto-generated list of segment lengths based on the number of pier tables. Select the pier tables that require length changes and input the following: Zone1, Zone2: Lengths of the segments located to the left and right of the first interior pier table. The Zone 1 represents an end span, and the Zone 2 represents the interior spans (when Note Curvature1, Curvature2: Exp.: Highest exponents of the curvature equations defining the variable sections of the left and right segments in the Zone 1 and Zone 2 respectively on each side of each pier table. The exponent ranges between 1 and 2.
Note
Note
Note Note
1 Cell: No interior web is present. 2 Cell: A single interior web partitions the PSC box. Enter the maximum section dimensions for the pier table and the dimensions of the Key Segment. H1, H2..., B1, B2..., T: Dimensions related to the Key Segment part (Minimum section) H2-1, H3-1: Dimensions related to the pier table (Maximum section) Note
Bitmap Drawing Update
Enter the weight of Form Traveler. It is applied to the construction stages as load groups identified such as 'FT-P2Seg3'. The last number signifies the stage number. Note Include Wet Conc. Load Note P e: Eccentricity to account for the moment due to the weight of concrete (refer to the diagram)
When Type 2 is selected, this tab allows the user to define Sections for Pier Table and Center (Key Segments, FSM) by importing previously defined Sections.
Center: Select a Section previously defined by the user for Center. If a Section has not been defined, click Pier Table: Select a Section previously defined by the user for Pier Table. Diaphragm: Select a Section previously defined by the user for the Support of Pier Table. This is enabled only when the Advanced option of Pier Table is selected on Model tab. Update Display: Update the Section configuration.
Specify the tendon placement and magnitude of prestress. Check off the box not to consider the tendon placement.
Specify the types of the top and bottom tendons. Click the
Specify the tensioning stresses for the top and bottom tendons. Su: Ultimate tensile strength Sy: Yield strength
Specify the number of tendons anchored to each segment.
Note
Note
Note
1 Cell: No interior web is present. 2 Cell: A single interior web partitions the PSC box.
Referring to the guide diagram, enter the tendon locations and spacings.
Note
Define the anchorage position of the bottom tendons in the segments. x: Anchorage distance relative to the segment length (refer to the diagram) Note
Specify the timing of grouting top tendons. Once the ducts are grouted, the transformed section properties are subsequently considered. The input signifies the timing of incorporating the transformed properties. Prestressing step Every n Stage
Specify the tendon placement and magnitude of prestress. Check off the box not to consider the tendon placement.
Name of Tendon Group
Referring to the guide diagram, enter the Baseline of each Tendon Group. For example, to define the tendons of PSTG (top slab tendons of the pier table), use one of the tendons of PSTG as the Baseline reference and specify Bi to enter the remaining tendons. The use of Group Baseline simplifies the input of tendons of each Tendon Group.
Bi: The horizontal distance from the Baseline to the tendon. The left of the Baseline is considered (+) positive and the right side is considered (-) negative. If 0 is specified for the Baseline, the horizontal distance from the center of the section to the tendon is entered. Hi: The vertical distance from the section top edge or bottom edge to the tendon. For PSTG and PWTG, the vertical distance from the section top edge to the tendon is specified. For CSTG, CWTG, ASTG and AWTG, the vertical distance from the section bottom edge to the tendon is specified.
Ai: Enter the distance from the Segment end to the point of Anchorage in the longitudinal direction. Enter 0 for the Anchorage, which is located at the Segment end. Bi: Enter the distance from the Baseline to the Anchorage across the section. Hi: Enter the vertical distance from the section top edge or bottom edge to the Anchorage. For PSTG and PWTG, enter the vertical distance from the section top edge to the Anchorage. For CSTG, CWTG, ASTG and AWTG, enter the vertical distance from the section bottom edge to the Anchorage. Ri: Enter the radius of curvature of the tendon. Θi: Enter the slope of the tendon. Segment: Select the Segment in which the Anchorage is included. By default, P.T. (Pier Table) is specified. If the Anchorage is located at a Segment other than P.T., select a relevant Segment. Segments in the drop-down list are automatically generated in an equal number of Segments entered in the Model tab.
Define the Anchorage positions of the tendons in side spans. This becomes active only for the Tendon Groups (ASTG and AWTG) of side spans. Ai: Enter the distance from the Segment end to the point of Anchorage in the longitudinal direction. Enter 0 for the Anchorage, which is located at the Segment end. Bi: Enter the distance from the Baseline to the Anchorage across the section. Hi: Enter the vertical distance from the section top edge or bottom edge to the Anchorage. For PSTG and PWTG, enter the vertical distance from the section top edge to the Anchorage. For CSTG, CWTG, ASTG and AWTG, enter the vertical distance from the section bottom end to the Anchorage. Ri: Enter the radius of curvature of the tendon. Θi: Enter the slope of the tendon. Segment: Select the Segment in which the Anchorage is included. By default, P.T. (Pier Table) is specified. If the Anchorage is located at a Segment other than P.T., select a relevant Segment. Segments in the drop-down list are automatically generated in an equal number of Segments entered in the Model tab.
Specify the types of the top and bottom tendons. Click the
Specify the tensioning stresses for the top and bottom tendons. Su: Ultimate tensile strength of tendons Sy: Yield strength of tendons
Specify the timing of grouting top tendons. Once the ducts are grouted, the transformed section properties of tendon and grout are subsequently considered. The input signifies the timing of incorporating the transformed properties. Every n Stage Note Place the mouse cursor over the dots representing Tendon or Anchorage, and right click to prompt a tool-tip and display Tendon and Anchorage information at the bottom of the View. The user can define colors for Tendon Groups by selecting a Tendon Group from the combo box at the bottom followed by assigning a color. Tendon Groups are expressed differently for Center and Pier Table as follows: Center: CSTG, CWTG, ASTG, AWTG Pier Table: PSTG, PWTG
Open the data saved as in the *.wzd file type in the FCM Bridge Wizard. By using this function, we can re-execute midas Civil and subsequently check and modify the previously entered data within the Wizard.
Save the data entered in the FCM Bridge Wizard as the *.wzd file type. |
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