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Latest articles

  • Increments and iterations
  • Convergence criterias
  • Modifying domains
  • Basics of vibration and seismic analysis
  • Grasshopper installation guide
  • Removal of unnecessary elements
  • Creation of a simple model using AxisVM COM server

Installation & Licencing

  • Setting up the COM server using Python
  • Setting up the COM server using Visual Studio
  • Error code 70 – Sentinel SuperPro-NET key
  • AxisVM-Autodesk Revit interface does not appear in Revit
  • Error when installing update package – errorcode 5
  • Error code -115
  • Save and restore settings

General

  • Parameter is incorrect – AxisVM does not start
  • Coordinate Systems
  • AXS files are not recognized by Windows 10
  • Access violation in module atio6axx.dll error message
  • Program can’t start due to spro_aex64.dll error message
  • Shear cross-section area Ay/Az

Modeling

  • Modifying domains
  • Removal of unnecessary elements
  • Creation of a simple model using AxisVM COM server
  • Compression or tension-only line elements
  • Scissor joint

Loads

  • Filter out critical load combinations
  • Auto-generated wind load differs from standard values
  • List of AxisVM messages – Loads
  • Number of automatic loadcombinations

Analysis & Results

  • Increments and iterations
  • Convergence of non linear calculations
  • Signs of internal forces
  • Newton-Raphson iteration for SDOF and MDOF systems
  • Convergence criterias
  • List of AxisVM messages – Analysis 
  • FOOTFALL ANALYSIS GUIDE
  • Simultaneous internal forces for connection design
  • The model contains singularities, unstable mode
  • Smoothing of results on beam and rib elements
  • Mathematical relative calculation errors
  • No convergence after nonlinear analysis

Vibration & Earthquake

  • Basics of vibration and seismic analysis
  • Modal response spectrum analysis mass participation can’t reach 90%

Design

  • Simply supported timber beam deflection check in module TD1
  • Buckling coefficients in Design calculation differs from Design parameters setting
  • List of AxisVM messages – RC design
  • X-LAM GUIDE – Structural Description of X-LAM Members
  • Critical results for concrete columns
  • AUTO Mcr GUIDE
  • APPLICATION OF STEEL CONNECTION (SC1 MODULE)
  • AutoNcr FLEXURAL BUCKLING COEFFICIENT CALCULATION (Guide)
  • Reducing the time of the design process

Reinforcement

  • Actual reinforcement rendering on the 3D model view

Documentation

  • Options for editing drawings of report maker

Elements

  • Compression or tension-only line elements

BIM Connections

  • Modeling doubly curved surfaces
  • Grasshopper installation guide
  • IFC connection

Mesh generation

  • Generating mesh for surface elements

AXISVM API

  • Grasshopper installation guide
  • Creation of a simple model using AxisVM COM server
  • Home
  • Analysis & Results
  • Signs of internal forces

Signs of internal forces

Table of Contents
  • Internal Forces
    • Normal force
    • Bending moment
    • Shear force
    • Torsion moment (line elements)
  • Coordinate System for Results
    • Reinforcement

The direction of the signs are always determined based on the active coordinate system.

Internal Forces #

The following description of sign convention is valid for linear and surface elements. It is designed in a way to allow the determination of the acting force at any time without doubt, specially for elements with arbitrary orientation in three-dimensional space.

Normal force #

  • Positive: Tension
  • Negative: Compression

Bending moment #

  • Positive: Tension stress at the surface with positive local z-coordinates
  • Negative: Tension stress at the surface with negative local z-coordinates

Using this convention, bending moments get the inverse sign compared to the classical sign convention used in planar slab calculations. As a consequence, the field moments in slabs are negative, the support moments (above columns and walls) are positive.

Shear force #

  • Positive: Shear force acts in positive local coordinate direction
  • Negative: Shear force acts in negative local coordinate direction

Torsion moment (line elements) #

  • Positive: Right-turning, around an axis in positive local x-direction
  • Negative: Right-turning, around an axis in negative local x-direction

Coordinate System for Results #

In the main window, the deformations (displacements, rotations) are shown in global coordinates (capital letters X, Y, Z). But in the result overview (clicking on the element), local coordinates are used (small letters x, y, z).

For the deformations (displacements, rotations), global coordinates (capital letters X, Y, Z) are used in the main view. In the summary (click on the beam), the deformations are shown in local coordinates (lower case letters x, y, z). All other results refer to local coordinates (lower case letters x, y, z).

Reinforcement #

The “reinforcement values” and the “actual reinforcement” refer to the element’s local coordinate system.

  • Top: Surface with positive local z-coordinates.
  • Bottom: Surface with negative local z-coordinates.

For slabs the names are intuitive. ‘Top’ and ‘bottom’ refer to the surfaces as expected, as long as the local coordinate system (local z-reference) is unchanged by the user.

For the walls the expressions ‘top’ and ‘bottom’ refer to the two surfaces of the wall. If different 

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reinforcements should be used on the two surfaces (e.g. walls in the ground) the surfaces can be identified by the local coordinate system (the surface to which the green z-axis points is the ‘top’). 

The x- and y-direction is also given by the local coordinate system. Without manual changes, the local y-axis is vertical, the x-axis is horizontal in the walls’ plane.

Source: Ingware AG

Still stuck? How can we help?

How can we help?

Newton-Raphson iteration for SDOF and MDOF systemsConvergence of non linear calculations
Table of Contents
  • Internal Forces
    • Normal force
    • Bending moment
    • Shear force
    • Torsion moment (line elements)
  • Coordinate System for Results
    • Reinforcement

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