> For the complete documentation index, see [llms.txt](https://docs.openbrim.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openbrim.org/developers/paramml-developer-guide/core-objects/finite-elements-objects/feline.md).
# FELine
An FELine object is used to model beams, columns, and other structural elements that connect two Node objects. To create an FELine object, two Node objects and a Section object are required. The beta parameter represents the angle of rotation of the section around the Z-axis and is expressed in radians.
**Example Syntax:**
```
...
...
...
```
**Example:**
```xml
```
 To view this example in the library, see ()
**Example:**
```xml
```
 To view this example in the library, see ()
Rigid diaphragms have extremely high in-plane stiffness properties, so they do not experience membrane deformation or generate the associated forces.
Given these benefits, we can use rigid diaphragms for calculations in our projects.
In OpenBrIM's Finite Element Analysis, rigid diaphragms can be defined “**Rigid Line”** as shown in the example.
**Example:**
```xml
```
 To view this example in the library, see ()
**Parameters of FELine Object:**
\| | **Label** | **Mandatory** | **Name and Type Attributes** | **Default Description and Value Attributes** | **Other Attributes** | | --- | --- | --- | --- | --- | | 1 | Node 1 | Yes | N="Node1" T="Node" | D="Node 1: The start node of the finite element." V="" | Role="Input" | | 2 | Node 2 | Yes | N="Node2" T="Node" | D="Node 2: The end node of the finite element." V="" | Role="Input" | | 3 | Beta Angle | No | N="BetaAngle" T="Expr" | D="Beta Angle: The orientation angle to rotate the cross-section about the length of the finite element." V="0" | Role="Input" UT="Angle" UC="Section" | | 4 | Section | Yes | N="Section" T="Section" | D="Section: The cross-section property of the finite element." V="" | Role="Input" |
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://docs.openbrim.org/developers/paramml-developer-guide/core-objects/finite-elements-objects/feline.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.