AASHTOWare BrD 6.8. BrR and BrD Tutorial. PS7-3 Stem PS Bridge Example
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1 AASHTOWare BrD 6.8 BrR and BrD Tutorial PS7-3 Stem PS Bridge Example
2 BrR and BrD Training PS7 3 Stem PS Bridge Example From the Bridge Explorer create a new bridge and enter the following description data. Close the window by clicking OK. This saves the data to memory and closes the window. Last Modified: 7/26/2016 1
3 To enter the materials to be used by members of the bridge, click on the to expand the tree for Materials. To add a new concrete material, click on Concrete in the tree and select File/New from the menu (or right mouse click on Concrete and select New). Enter the following data for the concrete to be used for the beam and the deck. Click OK on each window to save the data to memory and close the window. Last Modified: 7/26/2016 2
4 Last Modified: 7/26/2016 3
5 To add a new reinforcement material, click on Reinforcing Steel in the tree and select File/New from the menu (or right mouse click on Reinforcing Steel and select New). Add the reinforcement material Grade 60 from the Library by clicking the Copy from Library button. Select the Grade 60 material and click OK. The selected material properties are copied to the Bridge Materials Reinforcing Steel window as shown below. Click OK to save the data to memory and close the window. Last Modified: 7/26/2016 4
6 Add a prestress strand material using the same techniques. The window will look like the one shown below. Last Modified: 7/26/2016 5
7 To enter a prestress beam shape to be used in this bridge, expand the tree labeled Beam Shapes. Last Modified: 7/26/2016 6
8 Click on Tee Beams in the tree and select File/New from the menu (or double click on Tee Beams in the tree). The window shown below will open. Enter the following dimensions and possible prestress strand locations for the exterior beam. Last Modified: 7/26/2016 7
9 Click OK to save the data to memory and close the window. Select Yes to re-compute the cross sectional properties. Last Modified: 7/26/2016 8
10 Create another prestress tee beam to be used as the interior beam. Enter the following dimensions and possible prestress strand locations. Click OK to save the data to memory and close the window. Select Yes to re-compute the cross sectional properties. Last Modified: 7/26/2016 9
11 To enter the appurtenances to be used within the bridge, expand the tree branch labeled Appurtenances. Double click on Parapet in the tree and enter the following data. Click OK to save the data to memory and close the window. Last Modified: 7/26/
12 Double click on Railing in the tree and enter the following data. Click OK to save the data to memory and close the window. Last Modified: 7/26/
13 The default impact factors, standard LRFD and LFD factors will be used so we will skip to Superstructure Definition. Bridge Alternatives will be added after we enter the Superstructure Definition. Double click on SUPERSTRUCTURE DEFINITIONS (or click on SUPERSTRUCTURE DEFINITIONS and select File/New from the menu or right mouse click on SUPERSTRUCTURE DEFINITIONS and select New from the popup menu) to create a new superstructure definition. The window shown below will open. Select Girder System and the Superstructure Definition window will open. Last Modified: 7/26/
14 Enter the appropriate data as shown below. Span lengths for a prestressed beam structure made continuous for live load should be entered as follows. Span Length Span Length Span Length CL Brg CL Pier CL Pier CL Brg Click on OK to save the data to memory and close the window. Last Modified: 7/26/
15 The partially expanded Bridge Workspace tree is shown below. Last Modified: 7/26/
16 We now go back to the Bridge Alternatives and create a new Bridge Alternative, a new Superstructure, and a new Superstructure Alternative as we did in previously. Select the superstructure definition we just created in the new Structure Alternative. The partially expanded Bridge Workspace tree is shown below. Last Modified: 7/26/
17 Click Load Case Description in the tree branch labeled 3 Span 19 Girder System to define the dead load cases. The completed Load Case Description window is shown below. Last Modified: 7/26/
18 Double click on Framing Plan Detail to describe the framing plan. Enter the appropriate data as shown below. Last Modified: 7/26/
19 Switch to the Diaphragms tab to enter the exterior diaphragm spacing. Click the Diaphragm Wizard button to add diaphragms for the entire structure. Select the Framing Plan System and click the Next button. Enter the following data on the dialog shown below. Click the Finish button to add the diaphragms. The Diaphragm Wizard will create diaphragms for all of the girder bays in the structure. The diaphragms created for Girder Bay 1 are shown below. Select OK to close the window. Last Modified: 7/26/
20 While Framing Plan Detail is selected in the BWS tree, open the schematic for the framing plan by selecting the View schematic toolbar button or Bridge/Schematic from the menu. The following schematic will be displayed. Last Modified: 7/26/
21 Next define the structure typical section by double clicking on Structure Typical Section in the Bridge Workspace tree. Input the data describing the typical section as shown below. Basic deck geometry: Last Modified: 7/26/
22 The Deck (cont d) tab is used to enter information about the deck concrete and thickness. The material to be used for the deck concrete is selected from the list of bridge materials described above. Last Modified: 7/26/
23 Parapets: Add two parapets as shown below. Railings: Add two railings as shown below. Last Modified: 7/26/
24 Sidewalks: Add two sidewalks as shown below. Lane Positions: Select the Lane Position tab and add two travelways as shown below. Click OK to save the data to memory and close the window. Last Modified: 7/26/
25 Now define a Stress Limit. A Stress Limit defines the allowable concrete stresses for a given concrete material. Double click on the Stress Limits tree item to open the window. Select the Beam Concrete concrete material. Default values for the allowable stresses will be computed based on this concrete and the AASHTO Specifications. A default value for the final allowable slab compression is not computed since the deck concrete is typically different from the concrete used in the beam. Click OK to save this information to memory and close the window. Last Modified: 7/26/
26 Double click on the Prestress Properties tree item to open a window in which to define the prestress properties for this superstructure definition. Define the Prestress Property as shown below. We are using the AASHTO method to compute losses so the General P/S Data tab is the only tab that we have to visit. Click OK to save to memory and close the window. Last Modified: 7/26/
27 Define the vertical shear reinforcement by double clicking on Vertical (under Shear Reinforcement Definitions in the tree). Define the reinforcement as shown. The I shape shown is for illustrative purposes only, it is not mean to display the actual beam shape. Click OK to save to memory and close the window. Last Modified: 7/26/
28 A partially expanded Bridge Workspace is shown below. Last Modified: 7/26/
29 Describing the exterior Member: Double click on the G1 tree item to open the Member window for the exterior beam. The Member window shows the data that was generated when the superstructure definition was created. The first Member Alternative that we create will automatically be assigned as the Existing and Current Member Alternative for this member. Enter the pedestrian load as shown below. Last Modified: 7/26/
30 Open the Member Loads window and select the Distributed tab to define a distributed load for Load Case DC2. The window is shown below. Last Modified: 7/26/
31 Defining a Member Alternative: Double click MEMBER ALTERNATIVES in the tree to create a new alternative. The New Member Alternative dialog shown below will open. Select Prestressed (Pretensioned) Concrete for the Material Type and PS Precast Tee for the Girder Type. Click OK to close the dialog and create a new member alternative. Last Modified: 7/26/
32 The Member Alternative Description window will open. Enter the appropriate data as shown below. The Schedule based Girder property input method is the only input method available for a prestressed concrete beam. Last Modified: 7/26/
33 Specifying the Beam Details: Double click Beam Details in the tree to open the Beam Details window. Enter the span details as shown below. The Continuous Support Detail tab is only shown for a multi-span structure. The following data describes the distances from the centerlines of bearing to the centerlines of the piers. Last Modified: 7/26/
34 Note that Stress Limit Ranges are defined over the entire length of the precast beam, including the projections of the beam past the centerline of bearing which were entered on the Span Detail tab. The Stress Limit names appearing in the listbox in the Name column correspond to the Stress Limits associated with the concrete material specified for that span on the Span Detail tab. Enter values on the Slab Interface tab as shown below. Last Modified: 7/26/
35 The Continuity Diaphragm tab is only displayed for multi-span structures. The data on this tab defines the cast-inplace diaphragms used to make the structure continuous for live load. Press F1 while on this tab to view the continuity diaphragm help topic describing the use of this information. Click OK to save the Beam Details data to memory and close the window. Last Modified: 7/26/
36 Expand the tree under Strand Layout and open the Span 1 window. Place the cursor in the schematic view on the right side of the window. The toolbar buttons in this window will become active. Adjust the schematic of the beam shape so that the entire beam is visible. Select the Description Type as Strands in rows and the Strand Configuration Type as Straight/Debonded. The Mid span radio button will now become active. You can now define the strands that are present at the middle of the span by selecting strands in the right hand schematic. Select the strands in the schematic as shown below. Click OK to save the Strand Layout to memory and close the window. Last Modified: 7/26/
37 Open the Span 2 window. Select the Description Type as Strands in rows and the Strand Configuration Type as Harped. Define the strands that are present at the middle of the span by selecting strands in the schematic as shown below. Last Modified: 7/26/
38 Now select the Left end radio button to enter data concerning the harping of the strands. Enter m as the location of the harp point from the left end of the precast beam. The strand pattern at the harp point is the same as the strand pattern at the middle of the span and cannot be modified. Select the following harped strand locations at the left end of the precast beam. Click OK to save the Strand Layout to memory and close the window. Last Modified: 7/26/
39 Enter the following data for Span 3 in the same manner as Span 1. Click OK to save the Strand Layout to memory and close the window. Last Modified: 7/26/
40 Next open the Deck Profile and enter the data describing the structural properties of the deck. The window is shown below. The deck reinforcement in the negative moment regions is described as follows. Last Modified: 7/26/
41 The Shear Reinforcement Ranges are entered as described below for each span. The vertical shear reinforcement is defined as extending into the deck on this tab. This indicates composite action between the beam and the deck. Data does not have to be entered on the Horizontal tab to indicate composite action since we have defined that by extending the vertical bars into deck. Last Modified: 7/26/
42 The description of this exterior beam for the superstructure definition is complete. Last Modified: 7/26/
43 Describing the interior Member: Double click on the Member Loads under G2 tree item to open the Member Load window for the interior beam. Next define the same distributed load that we used in G1 for G2. Enter kn/m as the pedestrian load. The same pedestrian load we used in G1. Defining a Member Alternative: We are going to make a copy of the Exterior PS Tee Alternative member alternative and change the data for the interior beam in this copy. To make a copy of Exterior PS Tee Alternative, click on Exterior PS Tee Alternative in the tree and select Edit/Copy from the menu. Now click on MEMBER ALTERNATIVES under G2 in the tree and select Edit/Paste from the menu. The Bridge Workspace tree will be updated with the new copy as shown below. Last Modified: 7/26/
44 Double click on the Copy of Exterior PS Tee Alternative member alternative to open the Member Alternative Description window. Change the name to Interior PS Tee Alternative as shown below. Click OK to save the data to memory and close the window. Last Modified: 7/26/
45 Double click Beam Details in the tree to open the Beam Details window. Change the Beam Shape selection to Tri- Deck Interior Beam. The window is shown below. Next open the Deck Profile and change the data describing the structural properties of the deck as shown below. The description of this interior beam for the superstructure definition is complete. Last Modified: 7/26/
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