Tips & Tutorials Elastic Link Rigid End Offset boundary condition Analysis Manual for Midas/Gen

What are Boundary Conditions?

Yeong-il SeoJanuary 27, 2022



Boundary conditions are distinguished by nodal boundary conditions and element boundary conditions.

Nodal boundary conditions:

  • The constraint for the degree of freedom
  • Elastic boundary element (Spring support)
  • Elastic link element (Elastic Link)

Element boundary conditions:

  • Element end release
  • Rigid end offset distance (Beam End Offset)
  • Rigid link



1. Constraint for Degree of Freedom

2. Elastic Boundary Elements (Spring Supports)
3. Elastic Link Element
4. General Link Element

5. ElementEnd Release

6. Rigid End Offset Distance

     6-1 Automatic consideration of panel zone stiffness

     6-2 Method for the rigid end offset distances at both ends of beams using "Beam End Offsets"

7. Master and Slave Nodes (Rigid Link Function)

8. Specified Displacements of Supports


Tips & Tutorials Construction Stage Analysis Time Dependent Material Properties Creep and Shrinkage Analysis Manual for Midas/Gen

Construction Stage Analysis of MIDAS/Gen Manual Options

Yeong-il SeoJanuary 20, 2022



A building structure is typically constructed floor by floor in the case of a reinforced concrete structure or often constructed several floors at a time in the case of a structural steel structure. Even on the same floor, different parts are constructed at different stages.

A typical structural analysis entails applying the loads to the completed structure at once. This results in significant discrepancies as the scale of the building increase, especially as the number of stories increases. Regardless of the type of construction, construction dead loads on a particular floor are typically acting on the structure without the presence of the upper floors during the construction. This actually results in completely different column shortenings from the analysis results based on the “full loading on the completed structure”.  The change of strength gain, creep and shrinkage in the case of reinforced concrete construction compound the discrepancies. MIDAS/Gen enables the engineer to account for the change of geometries and time-dependent material properties during and after the construction.

Each temporary structure at a particular stage of construction affects the subsequent stages. Also, it is not uncommon to install and dismantle temporary supports during construction. The structure constantly changes or evolves as the construction progresses with varying material properties such as modulus of elasticity and compressive strength due to different maturities among contiguous members. The structural behaviors such as deflections and stress re-distribution continue to change during and after the construction due to varying time-dependent properties.

Since the structural configuration continuously changes with different loadings and support conditions, and each construction stage affects the subsequent stages, the design of certain structural components may be even governed during the construction. Without such construction stage analysis, the conventional analysis will not be reliable.



1. Analysis Reflecting Erection Sequence

2. Time-Dependent Material Properties
    2-1. Creep and Shrinkage
    2-2. Methods of Calculating Creep
    2-3. Development of Concrete Compressive Strength

3. Input Process of Time-Dependent Material Properties
4. Definition and Composition of Construction Stages
5. Procedure for Construction Stage Analysis


Tension-Only Elements Truss Elements Compression-Only Elements Analysis Manual for Midas/Gen Two-Dimensional Axisymmetric Element

Element Stiffness Data

Yeong-il SeoJanuary 13, 2022


Tension-Only Elements Truss Elements Compression-Only Elements Analysis Manual for Midas/Gen Two-Dimensional Axisymmetric Element

Important Aspects of Element Selection in Analysis Manual for MIDAS/GEN

Yeong-il SeoJanuary 6, 2022


Cable Elements Tension-Only Elements Truss Elements Compression-Only Elements Analysis Manual for Midas/Gen Two-Dimensional Plane Strain Element Two-Dimensional Axisymmetric Element

Types of Elements and Important Considerations

Yeong-il SeoDecember 30, 2021


Tips & Tutorials Structural Design Cable Elements Tension-Only Elements Truss Elements Nonlinear Elements Compression-Only Elements

Design Method of Structures Using Cable and Truss Elements

Yeong-il SeoDecember 23, 2021


Construction Stage Structure Insight High-rise building Low-rise building Construction Stage Analysis Structural Design Column Shortening

Applications of Construction Stage Analysis in Structural Design

Yeong-il SeoDecember 16, 2021


News & Trends Seismic Analysis Seismic Isolation Lead Rubber Bearing LRB Seismic Isolator Seismic Isolating System Friction Pendulum System

How to Perform Seismic Isolation Analysis?

Yeong-il SeoDecember 9, 2021


Tips & Tutorials Basement Modeling Underground Analysis Underground Modeling Basement Analysis

Modeling Guide for Basement Floors

Yeong-il SeoDecember 2, 2021


Structure Insight Seismic Analysis Seismic Loads Response Spectrum Analysis Nodal Body Force Static Seismic

What is Nodal Body Force Used for?

Yeong-il SeoNovember 25, 2021


News & Trends High-rise building Construction Stage Analysis Elastic Shortening Sequential Analysis Column Shortening Tall Building Long-Term Deflection Creep and Shrinkage

Why Long-Term Deformation should be considered?

Yeong-il SeoNovember 18, 2021


News & Trends Seismic Analysis RS Analysis Response Spectrum Analysis Irregular Building

Response Spectrum Analysis of an Irregular Structure

Yeong-il SeoNovember 11, 2021


News & Trends beam design as3600 aci813-14 column design Australian standard concrete design spacegass

The Comparison between AS3600:2018 and ACI318M-14 for ULS Design of Reinforcement Concrete

Yeong-il SeoNovember 4, 2021


Tips & Tutorials Membrane Element Shell Design News & Trend Plate Design Slab Design Wall Design

Shell Design Guide as per Eurocode 2

Yeong-il SeoOctober 28, 2021


Tips & Tutorials Cable Elements Nonlinear Analysis Tension-Only Elements Truss Elements Non-Linear Elements

Analysis and Design Method of Structures using Tension - Only Elements

Yeong-il SeoOctober 14, 2021


Project Tutorial FEM Analysis midas nGen design criteria

Target Ratio

Yeong-il SeoOctober 7, 2021


Project Tutorial BIM midas nGen midas Gen

Gen-nGen Interface

Yeong-il SeoSeptember 28, 2021


Structure Insight moment redistribution

How is Moment Redistribution Performed?

Yeong-il SeoSeptember 14, 2021


Structure Insight Seismic Analysis Pushover Analysis Seismic Load seismic design inelastic static analysis Performance Based Design Performance Based Seismic Design PBD Seismic Response Evaluation

How to perform Pushover Analysis?

Yeong-il SeoSeptember 10, 2021


News & Trends Plant Structures crane girder design guide white paper

Structural Design Tips for Crane Girder

Yeong-il SeoSeptember 1, 2021