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Gen 2014 Gen 2014 (v2.1) Release Note

Integrated Design System for Building and General Structures

midas Gen Release NoteRelease Date : May. 28, 2014

Product Ver. : 2014(v2.1)

Gen 2014 (v2.1) Release Note

Enhancements

(1) Addition of Singapore National Annex in Eurocode

(2) User-defined Shear Length in Pushover Analysis as per EN1998-3:2004

(3) Improvements on Eurocode Load Combination

(4) Improvements on Punching Shear Checking as per EN1992-1-1:2004

(5) Same Beam Rebar at Joints

(6) Cracked Section Stress in GSD

Analysis & Design 3

(6) Cracked Section Stress in GSD

(7) Damping Constant in Surface Spring Support

Pre & Post-Processing

(1) Improvements on Revit 2014 Interface

(2) Addition of Group Column in Elastic Link Result Table

(3) Unit Option for Tables and Graphs in Dynamic Report

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midas Gen Analysis & Design Enhancement Gen 2014 (v2.1) Release Note

1. Addition of Singapore National Annex in Eurocode

Model > Properties > Materials

Load > Lateral Loads > Wind Loads / Static Seismic Loads

Load > Response Spectrum Analysis Data > Response Spectrum Functions

• Steel material data base as per BC1:12, Appendix A is implemented. Design parameter py and fy are applied in the steel

code checking by different steel grades and thickness.

• Static Wind Load as per NA to SS EN 1991-1-4:2009 is implemented. In Singapore National Annex, structure type is used

instead of terrain category. Also fundamental basic wind velocity is applied as 20m/s and air density, ρ, is applied as1.194kg/m3.

• Response Spectrum Function and Static Seismic Load as per NA to SS EN 1998-1:2013 is implemented. In SingaporeNational Annex, only horizontal spectrum is required and ground type is limited as “C, D, and S1”. Also reference ground

acceleration is applied as 0.175m/s2.

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Material Properties Static Wind Load Response Spectrum Function


Results > CombinationsDesign > Concrete Design Parameter > Design CodeDesign > Steel Design Parameter > Design Code

• Steel, Concrete, and Footing load combination as per NA to SS EN 1990 is implemented. Default values of factors for

variable actions (Ψ) and partial factors for actions (γ) are changed based on the specified national annex.

• Concrete design as per NA to SS EN 1992-1-1:2008 is implemented. For RC beam, column, slab, and wall, ultimate limit

state and service limit state design are supported.

• Steel design as per NA to SS EN 1993-1-1:2010 is implemented. Steel code checking is provided for ultimate and service

limit state verification. Steel optimal design can be used based on the strength verification.

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Concrete Code Design Steel Code Checking & Optimal Design


2. User Defined Shear Length in Pushover Analysis as per EN 1998-3:2004

• In the previous version, when calculating total rotation at yielding and ultimate, “Ratio of moment /shear at the end section,

Lv” was always applied as 50% of member length. Now, the value of Lv can be specified by the user as an relative length or

absolute length.

•Shear length, Lv, is activated in RC/SRC Beam, Column, and Walls with Moment-Rotation(M-θ) hinge.

Design > Pushover Analysis > Define Pushover Hinge Properties

Total Chord Rotation Capacity (EN1998-3:2004, Annex A.3.1)

Limit State of Near Collapse

Limit State of Damage Limitation

Limit State of Significant Damage ¾ of the ultimate chord rotation, θum

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Define Pushover Hinge Properties


3. Improvements on Eurocode Load Combination

• Different value of Psi factor can be defined in the table format. This feature is useful when a building is composed of different

area such as residential, office, and shopping area since different Ψ factor for imposed load can be specified by categories.

• Temperature load case is now considered in the automatic generation of load combination as per Eurocode.

Results > Combinations

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Load Combination

Category B: Office Area

Category D: Shopping Area


4. Improvements on Punching Shear Checking as per EN1992-1-1:2004

• Control perimeter at which shear reinforcement is not required, uout, eff , is added in the text format report.

• In the previous version, punching shear check was skipped if the element type of column is truss. Truss element can now be

considered in punching shear check.

Design > Meshed Slab/Wall Design > Punching Shear Check

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Punching Shear Check


5. Same Beam Rebar at Joints

• In concrete code design, identical rebar will be provided in the adjacent ends. If the required rebar area is different between

two beams, greater rebar area will be applied.

• Elements with identical section IDs and material IDs can be assigned.

• When “All” is selected for Member Select option, the program can automatically detect members to have identical rebars.

Design > Concrete Design Parameter > Same Beam Rebar at Joints

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Equalize Beam Rebar Data


6. Cracked Section Stress in GSD

• Cracked section stresses in the elastic behavior without and with axial force are calculated for RC and SRC members.

• It is useful to check stress limitation under service limit state for the arbitrary sections and to calculate crack width using the

stresses of reinforcement.

• The effect of creep on the stresses is simply considered by using the user-defined ratio of modulus elasticity of reinforcement

to concrete.

• It is assumed that the tensile strength of concrete is zero. The neutral axis depth is determined using cracked transformed

section approach.

Tools > General Section DesignerCross Section

at CrackTransformed

SectionStrain

DistributionStress

DistributionCracked Elastic Behavior

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Cracked Section Stresses in midas GSD


7. Damping Constant in Surface Spring Support

Damping coefficient can be specified in Point Spring

Supports and Surface Spring Supports.

In case of Surface Spring Supports, spring stiffness and

damping coefficient per unit area needs to be defined

and the springs are automatically entered at each node

represented by concentrated stiffness and damping

constant. it is converted to the element support.

In Point Spring Supports, spring stiffness and damping

coefficient per unit length and unit angle needs to be

defined.

Damping constant is applicable in Response Spectrum

Model > Boundaries > Surface Spring Supports

Model > Boundaries > Point Spring Supports

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analysis and Time History analysis.

midas Gen Pre/Post-Processing Enhancement Gen 2014 (v2.1) Release Note

1. Improvements on Revit 2014 Interface

File > Import > midas Gen MGT File

•In the previous version, the user needed to write or modify section and material mapping file in text format file. In the new

version, auto-detecting function using DB section/material name has been newly added. The user can also manually add

mapping data in the dialog box more easily.

•Boundary conditions and loads can now be imported from Revit to midas Gen.

Functions Revit <> Gen

Linear

Elements

Structural Column <>

Beam <>

Brace <>

Curved Beam >

Beam System >

Truss >

Planar

Elements

Foundation Slab <>

Structural Floor <>

Structural Wall <>

Wall Opening & Window >

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Elements Wall Opening & Window >

Door >

Vertical or Shaft Opening >

Boundary

Offset >

Rigid Link >

Cross-Section Rotation >

End Release >

Isolated Foundation Support >

Point Boundary Condition >

Line Boundary Condition >

Wall Foundation >

Area Boundary Condition >

Load

Load Nature >

Load Case >

Load Combination >

Hosted Point Load >

Hosted Line Load >

Hosted Area Load >

Other

Parameters

Material <>

Level >

Section Mapping Dialog Box

Revit 2014 Gen 2014

midas Gen Pre/Post-Processing Enhancement Gen 2014 (v2.1) Release Note

2. Addition of Group Column in Elastic Link Result Table

•Boundary group of elastic links can be viewed in the resulttable along with link forces.

Result > Result Tables > Elastic Link

Elastic Link Result Table

3. Unit Option for Tables and Graphs in Dynamic Report

• In the previous version, units of tables and graphs in thedynamic report were always identical to the global unit system.In the new version, unit can be specified by tables and graphsseparately.

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Elastic Link Result Table

Tools > Dynamic Report Generator

Table/Chart Unit Dialog Box

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