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Fredrik Lagerström 22.1 1 {{box cssClass="floatinginfobox" title="**Contents**"}}
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Fredrik Lagerström 48.1 6 (% border="1" class="table-hover" style="width:609px" %)
7 |(% style="background-color:#0076cb; width:253px" %)(% style="color:#ffffff" %)**Point-point connection property**|(% style="background-color:#0076cb; width:353px" %)(% style="color:#ffffff" %)**Description**
8 |(% style="width:253px" %)Icon|(% style="width:353px" %)[[image:1585061609947-494.png]]
9 |(% style="width:253px" %)Modules where available|(% style="width:353px" %)[[image:1585061619320-710.png]] [[image:1585061630916-788.png]] [[image:1585061641169-791.png]] [[image:1585061648992-150.png]] [[image:1585061656315-804.png]]
10 |(% style="width:253px" %)Motion component direction|(% style="width:353px" %)Parallel with Global Z axis in [[image:1585061663738-507.png]]
11 |(% style="width:253px" %) |(% style="width:353px" %)Arbitrary direction in Global XY plane in [[image:1585061673010-340.png]] [[image:1585061693941-521.png]]
12 |(% style="width:253px" %) |(% style="width:353px" %)Arbitrary direction in [[image:1585061701689-389.png]] [[image:1585061718150-160.png]]
13 |(% style="width:253px" %)Rotation component direction|(% style="width:353px" %)Arbitrary direction in Global XY plane in [[image:1585061730417-134.png]]
14 |(% style="width:253px" %) |(% style="width:353px" %)Not available in [[image:1585061682271-841.png]] [[image:1585061689906-913.png]]
15 |(% style="width:253px" %) |(% style="width:353px" %)Arbitrary direction in [[image:1585061707534-269.png]] [[image:1585061721696-572.png]]
16 |(% style="width:253px" %)Geometry|(% style="width:353px" %)- (insertion points)
17 |(% style="width:253px" %)Available analysis results|(% style="width:353px" %)**Connection forces and moments**
18 |(% style="width:253px" %)Default Short Command|(% style="width:353px" %)CPT
Fredrik Lagerström 22.1 19
20 **Point-point connection**
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22 With //Point-point connection//, different connections can be defined between crossed or connected bars. It is very useful in 3D modules. Some typical examples:
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24 * **Bracing (called St Andrew’s cross)**
25 A hinged connection between two channels intersecting each other: free rotation around the axis perpendicular to the plane defined by the two channels. (It is not necessary to define the eccentricity; the next figure is schematic.)
Fredrik Lagerström 45.1 26 [[image:1585061767833-304.png]]
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Fredrik Lagerström 22.1 28
29 * **Independent bars**
30 Defining two bars crossed each other with their structural lines but having no connection in real state is a typical problem of modeling. Now, it can be solved easily by creating point-point connection in the bars' intersection with all components set to “free”.
Fredrik Lagerström 45.1 31 [[image:1585061781121-539.png]]
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Fredrik Lagerström 22.1 33 * **Semi-rigid connection between members**
34 At the **Connections** settings of members (//Bar > Default settings//) only fully rigid or different type of hinged end connections can be defined. But, //Point-point connection //command gives the possibility to model any other connection types like semi-rigid connection with given stiffness values for rotation. The stiffness values can be set according to the applied standard instructions.
Fredrik Lagerström 45.1 35 [[image:1585061799294-571.png]]
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Fredrik Lagerström 22.1 37 * **“Real state” modeling**
38 Real eccentric position (e.g. bars connected with their web plates) without eccentricity settings can be also modeled with //Point-point connection//.
Fredrik Lagerström 45.1 39 [[image:1585061818001-702.png]]
Fredrik Lagerström 22.1 40
41 **Definition steps**
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Fredrik Lagerström 46.1 43 1. Start [[image:1585061838255-190.png]] //Point-point connection// command from [[image:1585061843719-874.png]] [[tabmenu>>path:/xwiki/wiki/femdesignwiki/get/Manuals/User%20Manual/Structure%20definition/Borehole%20(Geometry)/?sheet=CKEditor.ResourceDispatcher&outputSyntax=plain&language=en&type=doc&reference=Manuals.User+Manual.Basic+concept.WebHome&typed=true&parameters%5Banchor%5D=HTabmenus]] and choose [[image:1585061849556-304.png]] //Define//.
Fredrik Lagerström 45.1 44 [[image:1585061858647-383.png]]
Fredrik Lagerström 47.1 45
Fredrik Lagerström 49.1 46 1. Set the properties of the new connection at [[image:1585061876438-865.png]] //Default settings//. See the settings possibilities and options at **Properties (Non-Linear Behaviors)**.
47 [[image:1585061884225-420.png]](((
Fredrik Lagerström 47.1 48
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Fredrik Lagerström 45.1 50 |(% style="width:116px" %)[[image:warning.png]]|(% style="width:1334px" %)(((
51 Applying a connection different from rigid state, the //Interface position// (//r//) is very important.
Fredrik Lagerström 22.1 52
Fredrik Lagerström 45.1 53 [[image:1585061955069-603.png]]
Fredrik Lagerström 22.1 54
Fredrik Lagerström 45.1 55 //r = distance between connection position and start point of definition /// //distance between start and end points of connection//
56 )))
Fredrik Lagerström 22.1 57
58 The next figure introduces the meaning of the interface position (//r//) (it has no effect if the connection points are in the same position!):
Fredrik Lagerström 45.1 59 [[image:1585061988211-670.png]]
60 )))
61 1. (((
62 Set the system for the **//direction//** of the connection components.
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64 1. (((
65 Select the first object you would like to connect.
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67 1. (((
68 Define the point of the first object you would like to start the connection.
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70 1. (((
71 Define the point of the second object you would like to end the connection. If the connection points between the two objects (crossed each other) are in the same position, just click [[image:1585062015998-874.png]] to define the connection end point.
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Fredrik Lagerström 22.1 73
74 Optional steps:
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Fredrik Lagerström 45.1 76 (% start="7" %)
77 1. Modify the connection properties with the [[image:1585062022771-564.png]] //Properties// tool of the tool palette.
78 1. Add members to a selected connection or remove members from it with [[image:1585062029474-544.png]] //Edit connected objects//.(((
79 |(% style="width:62px" %)[[image:1585062044523-740.png]]|(% style="width:1388px" %)The next figure shows the steps of adding a new member (beam) to a predefined point-point connection. First, select the connection you would like to modify and then choose the new object you would like to add to the selected connection. To remove a member of a connection, do the same steps with [[image:1585062051216-485.png]] .
80 [[image:1585062079166-820.png]]
Fredrik Lagerström 22.1 81
82 The next figure shows you the difference between the static-systems of the initial and modified states at all rigid bar end connections and defined hinged point-point connection.
Fredrik Lagerström 45.1 83 [[image:1585062117227-526.png]]
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Fredrik Lagerström 46.1 85 1. Set the display settings of connections at //Settings > All > Display > Connections//.[[image:1585062133140-338.png]](((
Fredrik Lagerström 45.1 86 |[[image:warning.png]]|**“**//Label//” represents the connections’ ID number generated by analysis/design calculation or by clicking //Refresh numbering// (//Tools// menu).
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88 1. (((
89 The connections are stored on “Modeling tools” **Object layers**. At layer settings, the default color defines the connection label color.
Fredrik Lagerström 22.1 90 Each connection element has its own local system. The connection symbol (darker colors, thicker lines etc.) shows the objects having one of the associated above mentioned connection types.
Fredrik Lagerström 45.1 91 \\The following figure shows an example how the program makes different symbols depending on what object was selected during the selection of the connected points. But note, that although the definition ways are differ at the column-plate connections, if the properties (directions, components and stiffness values) are the same at both point-point connections (here in the example, hinged connection = all rotation components are free), the static-systems are also the same.
92 \\[[image:1585062198132-144.png]]
93 )))
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