Introduction: RS 3 Tutorial 1 Quick Start

Transcription

1 Introduction: RS 3 Tutorial 1 Quick Start Welcome to RS 3. This tutorial introduces some basic features of RS 3. The model analyzes the effect of tank loading on an existing sloped underground tunnel. First the tunnel is excavated, then a shallow foundation is excavated, then the foundation is filled with concrete, and the last stage involves loading the foundation. The finished product of this tutorial can be found in the Tutorial 01 Quick Start.rs3dmodel file. All tutorial files installed with RS 3 can be accessed by selecting File Recent Tutorials folder from the RS 3 main menu. CONTENTS Introduction: RS 3 Tutorial 1 Quick Start... 1 Step 1: Starting the Model... 2 Creating A Blank Document... 2 Step 2: Editing The Project Settings... 2 Configuring The Units & Stages... 2 Other Options... 3 Step 3: Defining The Materials... 3 Defining Material Properties... 3 Step 4: Creating Geometry... 4 Defining The External Box... 4 Step 5: Excavating... 5 Creating A Cylinder For The Underground Tunnel... 5 Extruding A Circle For The Tank Foundation 6 Step 6: Staging... 8 Staging The Tunnel Excavation... 8 Staging The Foundation... 8 Step 7: Adding Stress Loading... 9 Applying A Surface Load To The Model... 9 Applying A Field Stress Step 8: Setting Boundary Conditions Adding Model Restraints Step 9: Meshing Configuring And Calculating Mesh Step 10: Computing Results Compute Step 11: Interpreting Results Displaying The Results Principal Stress Z Displacement Tutorial Key Concepts Excavation of sloped tunnel Shallow circular foundations Staged excavation and construction Tutorial 1: RS 3 1

2 Step 1: Starting the Model CREATING A BLANK DOCUMENT New Project Save Start RS 3 by selecting Programs Rocscience RS3 2.0 RS3 from the Windows start menu. RS 3 opens to a blank screen, which allows you to create a new model by pressing the [New Project] button. If the RS 3 application window is not already maximized, maximize it now so the full screen space is available for use. First, save as Tutorial 01 Quick Start.rs3dmodel: File Save. Step 2: Editing the Project Settings CONFIGURING THE UNITS & STAGES Project Settings The Project Settings dialog is used to configure the main analysis parameters for your RS 3 model. Open the dialog through File Project Settings. This will open the dialog on the first tab: [Units], and set Units = Metric, stress as kpa. Project Settings: Units Project Settings: Stages Select the [Stages] tab. Enter Number of Stages = 5, with names as shown above. Tutorial 1: RS 3 2

3 OTHER OPTIONS Next, select the [Groundwater] tab. Project Settings: Ground water Enter Method = None, then select the [Solver Options] tab. A major feature in RS 3 is the ability to do a Coupled analysis. This means that the groundwater and solids impact each other in the computation. For more information about the coupled analysis option, please visit the Help menu. We are not interested in groundwater results, so uncoupled analysis is adequate. It is recommended that the solver type be left as Automatic to ensure accurate results. Select [Project Summary] and enter Quick Start as the Project Title. Do not change any other settings. Select [OK] to close the dialog. Step 3: Defining the Materials DEFINING MATERIAL PROPERTIES Define Materials Under the same tab (Geology or Excavations) you can assign the materials and properties of our model through Materials Define Materials. By default, RS 3 assigns all created geology (not excavations) the material Material 1, so if you define Material 1 as the material you want the majority of the geology to be, you can save some time in assigning properties later. Enter the following properties for Material 1 and Material 2 in the [Stiffness] tab. Material 1: Enter Name = Soil, Initial Element Loading = Field Stress & Body Force, Unit Weight = 20 kn/m 3, then switch to [Material 2]. Tutorial 1: RS 3 3

4 Material 1 Properties: Stiffness Material 2: Enter Name = Concrete, Initial Element Loading = Body Force Only, Young s Modulus = kpa, then select [OK]. Material 2 Properties: Stiffness Step 4: Creating Geometry DEFINING THE EXTERNAL BOX Ensure the Geology tab is selected from the workflow at the top of the screen. RS 3 is designed with an intuitive workflow to help guide the user through the required steps in creating a model. Under each tab, the toolbars and menus are customized to provide the user with the functions they will need in each step of creating their model. RS 3 uses the Z direction as the default for the direction of gravity, so when creating geometry, it s important to keep this in mind to orient your model. Tutorial 1: RS 3 4

5 RS 3 uses an external box to act as the scope of the model, meaning only objects contained within or a part of the external box will be considered in the calculations. As such, when creating a model, it is important to realise the model s bounds before setting up the external box. Select: Geometry Create External Box. Create External A Create External dialog will open, enter First Corner (x, y, z) = (0, 0, 0), Second Corner (x, y, z) = (30, 30, -20), and Auto-Expand by = 0, then press [OK]. Step 5: Excavating CREATING A CYLINDER FOR THE UNDERGROUND TUNNEL Select the Excavations tab from the workflow at the top of the screen. We will now design the excavation bodies. Create Cylinder We need to define a cylinder for our underground tunnel, select: Geometry 3D Primitive Geometry Cylinder. When cutting into the external box to further detail the model, the objects can extend beyond the boundary without affecting the final model. It is encouraged when making objects that cut through the surface of the box to make them extend past the surface to ensure a clean cut through the external box. Create Cylinder Tutorial 1: RS 3 5

6 Enter Axis Start Point (x, y, z) = (10, -1, -8), Axis End Point (x, y, z) = (10, 31, -10), Radius = 1, Subdivisions = 25, then press [OK]. EXTRUDING A CIRCLE FOR THE TANK FOUNDATION Next we are going to create an extruded circle for our tank foundation. We could easily create the foundation through defining another cylinder as we did above for the tunnel, but for the purpose of demonstrating other features of RS 3, this cylinder will be created through a different (more lengthy) process. Draw a Polyline Select: Geometry Draw Tools Draw Polyline. A Draw Polyline panel will open on the left. Draw Polyline Close Polyline Pane Select Plane Orientation = XY, Origin (x, y, z) = (17.5, 15, 1), Path Definition = Circle, Circle Definition = Center and Radius, Radius = 5, U, V Coord = 0 0, [Enter], then press the blue checkmark to close the pane. Tutorial 1: RS 3 6

7 You can press on the grey arrow beside Discretization Settings to define the number of straight line segments that define the circle (or the approximate segment length), but here, the default is fine. Create Polygon from Polyline Extrude Geometry Select PolyLine 1 in the visibility pane (top left section), then press: Geometry Draw Tools Create Polygon from Polyline. A Create Polygons dialog will appear with Polyline1 listed, press [Create Polygons]. This will transform PolyLine1 to Polygon 1 in the visibility pane. This polygon must be extruded into the geology to model the excavation pit and sheet pile walls. Select Polygon 1 in the visibility pane. Then select Geometry Extrude/Sweep/Loft Tools Extrude and an Extrude Geometry dialog will appear. Keep Direction (x, y, z) = (0, 0, 1), and Depth = -1.5, then press [OK]. Extrude Geometry Divide All Geometry Now that we ve completed defining the external box, and the objects to be cut into it, we can divide our model according to the objects we defined: Geometry 3D Boolean Divide All Geometry. Tutorial 1: RS 3 7

8 Your 3D model should look similar to the one below. Current State of Model Step 6: Staging Notice that the excess bits we had defined in both cylinders has been omitted after dividing the geometry because it extended past the external boundary. STAGING THE TUNNEL EXCAVATION The tunnel is excavated at stage 2, meaning in stage 1 it should still be Soil. RS 3 separates stages through tabs at the bottom of the window. The screens will update loads, materials, and other staged elements as you make them active. This feature makes it easy to view the different states of the model at each stage. Starting with the tunnel, make sure the model is currently active on stage 2 Excavate tunnel (bottom pane of tabs). Now select the tunnel excavation body in the visibility pane, and in the properties pane, change the Applied Property = No Material. Once changing the property of a body, RS 3 will automatically make the following stages have the same property (e.g. if a body was excavated in stage 1, indicated through property being No Material, it will change from the original material to No Material in all subsequent stages as well). STAGING THE FOUNDATION The foundation is excavated at stage 3, and the concrete is poured in stage 4. Now we do the same excavation for the foundation as we completed for the tunnel, but starting from stage 3, select the stage tab Excavate foundation. Tutorial 1: RS 3 8

9 Select the foundation body from the visibility pane, then in the properties pane, change Applied Property = No Material. Now select Stage tab Pour concrete foundation, and in the foundations properties pane, change the Applied Property = Concrete. RS 3 also provides a quick visual summary of the currently selected object s state in each stage. For example, if you select the foundation in the visibility pane, on top of the stage tabs, you ll notice stage 1 and 2 have a purple line (indicating it is material 1), stage 3 is clear (indicating it is defined as no material), and stage 4 and 5 are red (concrete). Step 7: Adding Stress Loading APPLYING A SURFACE LOAD TO THE MODEL Next we go to the Loads tab. This tab allows you to edit the loading conditions. Faces Selection Select the foundation surface with Faces Selection mode active in the toolbar. Face Selected Tutorial 1: RS 3 9

10 Select: Loading Add Loads. Add Loads Add Loads Enter Magnitude = 200, and Install at Stage = Loading foundation, the rest should be default (check screenshot), then press [Apply]. APPLYING A FIELD STRESS Field Stress This tab also allows you to edit the field stress loading conditions, select: Loading Field Stress. Field Stress Enter Field Stress Type = Gravity, the rest should be default (check screenshot). Tutorial 1: RS 3 10

11 Step 8: Setting Boundary Conditions ADDING MODEL RESTRAINTS Move to the Restraints tab to assign restraints to the external boundary of the model. RS 3 has a built in Auto Restrain tool for use on underground models. Auto Restrain (Surface) Select: Restraints Auto Restrain (Surface). This completes the construction of the model (in terms of geometry). Step 9: Meshing CONFIGURING AND CALCULATING MESH Mesh Settings Next we move to the Mesh tab. Here we may specify the mesh type and discretization density for our model. For this tutorial, we will use a 10-node finite element mesh type. This is not the default mesh parameter so we will need to customize the mesh: Mesh Mesh Settings. The Mesh Settings dialog appears. This dialog allows you to customize parameters of your mesh. We want to use a graded, 10-noded element mesh. Mesh Settings Enter Element Type = 10-Noded Tetrahedra, Mesh Gradation = Graded. Press [OK]. Then mesh the model: Mesh Mesh. The mesh is now generated, your model should look like the one below. Mesh Current State of Model: Mesh Tutorial 1: RS 3 11

12 Step 10: Computing Results COMPUTE Save Next we move to the Compute tab. From this tab we can compute the results of our model. First, save your model: File Save. Use the Save As dialog to save the file, and next you need to save the compute file: File Save Compute File. You are now ready to compute the results. Select: Compute Compute. Compute The RS 3 Compute engine will perform the required finite element calculations. This computation may take a few minutes; however, more complex models may take a much longer time to compute. Once computation is complete, the dialog closes. Compute Engine Tutorial 1: RS 3 12

13 Step 11: Interpreting Results DISPLAYING THE RESULTS Next we move to the Results tab. From this tab we can analyze the results of our model. First, refresh the results: Interpret Refresh Results. Refresh Results On the top right corner of the Results tab, you should see two drop down menus: Excavation Contour The Element drop down menu allows you to view the results for solids, bolts, and liners. For this tutorial we can only view results for Solids. XZ Plane YZ Plane We will analyze a number of different Data Type results. Let s turn on the exterior contours so we can see some results: Interpret Show Excavation Contour. Also select: Interpret XZ Plane, and Interpret YZ Plane (with x, y, z = 18, 15, -10). PRINCIPAL STRESS In the top right corner of the Results tab, ensure Element = Solids, and change data type = Sigma 1 Effective: In order to compare each stage against each other visually, the contour colour scheme was standardized across all stages, select: Interpret Contour Legend Contour Options, and select the checkbox Auto Range (All Stages). Tutorial 1: RS 3 13

14 The Sigma 1 Effective results at stage 1-5 are shown below. Solids Sigma 1 Effective: Stage 1, 2 Solids Sigma 1 Effective: Stage 3, 4 Solids Sigma 1 Effective: Stage 5 Z DISPLACEMENT In the top right corner of the Results tab, ensure Element = Solids, and change data type = Total Displacement: Tutorial 1: RS 3 14

15 The Total Displacement results at stage 4-5 are shown below. Solids Total Displ: Stage 4, 5 Other results are available to view as well. Thank you, this concludes the tutorial. Tutorial 1: RS 3 15