---
type: concept
title: "Abaqus Structural Element Families"
complexity: advanced
domain: computational-mechanics
created: 2026-06-01
updated: 2026-06-01
address: c-000107
aliases:
  - Abaqus structural elements
  - Abaqus shell beam membrane truss elements
  - Abaqus shell elements
tags:
  - concept
  - finite-element-method
  - abaqus
  - structural-elements
  - shell-elements
status: current
related:
  - "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
  - "[[Abaqus Element Selection and Formulation]]"
  - "[[Abaqus Beam and Shell Section Definitions]]"
  - "[[Beam and Frame Finite Elements]]"
  - "[[Bar and Truss Finite Elements]]"
  - "[[MITC4 Shell Element]]"
  - "[[Shell Locking Phenomenon]]"
sources:
  - "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
---

# Abaqus Structural Element Families

## Definition

Abaqus structural element families model lower-dimensional structural idealizations such as membranes, trusses, beams, frames, elbows, conventional shells, continuum shells, and axisymmetric shells.

## How They Work

Structural elements reduce dimensionality by introducing kinematic assumptions and section behavior. Trusses carry axial force. Beams and frames add bending, shear, torsion, rotations, and cross-section behavior. Membranes carry in-plane behavior without bending stiffness. Shells represent surface-like structures with membrane, bending, and transverse shear effects.

The shell library splits into conventional shell elements, continuum shell elements, and axisymmetric shell elements. Conventional shells use midsurface and thickness-section definitions, while continuum shells are three-dimensional in topology but shell-like through their section behavior. This makes element choice tightly coupled to section definition, thickness integration, and expected locking behavior.

## Why It Matters

Structural elements are efficient only when their assumptions match the physical structure. A beam or shell can be much cheaper than a solid model, but the section definition, orientation, transverse shear treatment, and connection to other element families become part of the model.

## Connections

- [[Abaqus Beam and Shell Section Definitions]] defines the section data that makes structural elements meaningful.
- [[Beam and Frame Finite Elements]] and [[Bar and Truss Finite Elements]] provide the textbook structural-member background.
- [[MITC4 Shell Element]] and [[Shell Locking Phenomenon]] explain why low-order shell interpolation needs careful strain treatment.
- [[Abaqus Element Selection and Formulation]] describes how product, family, and formulation variants are encoded in element names.

## Sources

- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]