Import

 

 

 

Import MGT files as well as other types of files.

 

 

 

From the Main Menu select File > Import > MIDAS/Gen MGT File.

 

From the Main Menu select File > Import > AutoCAD DXF File.

 

From the Main Menu select File > Import > SAP2000(V6, V7) File.

 

From the Main Menu select File > Import > SAP2000(V8) File.

 

From the Main Menu select File > Import > STAAD2000 File.

 

From the Main Menu select File > Import > STAAD2002 File.

 

 

 

 

MIDAS/Gen MGT: Import an MGT file (text input file of MIDAS/Gen)

 

 

AUTOCAD DXF: Import an AUTOCAD DXF file.

 

       Import DXF File dialog box

 

 

Note 1
When importing an DXF file, models can be generated by layers.

 

Even in case of element shape errors (e.g., overlapping nodes) during DXF file import, the import can be executed as the program is ignoring the parts with errors. In the message window, the following error messages will display. "[WARNING] Invalid Node(No.XX) is skipped!", "[WARNING] Invalid Element(No.XX) is skipped!"

 

Polyline cannot be imported. Split a Polyline into Lines.

 

 

Revision of Ver.7.6.1

 

Note 2

Various polyline types, such as polygon, triangle, rectangle, etc., can be imported to midas Gen as plate elements in .DXF format, where plate elements are imported as thick type (without drilling DOF)

 

 

SAP2000(V6, V7) File

Convert a fn.s2k file (SAP2000 data file) into an MGT text input file of MIDAS/Gen. The fn.s2k file is created by *.s2k Export in SAP2000.

The limitations of converting a SAP2000 file into a MIDAS/Gen data file are as follows:

SAP2000 command

Detail command

Conversion

Limitation

MIDAS/Gen function

System

DOF

O

-

*STRUCTYPE

LENGTH, FORCE

O

-

*UNIT

CYC

O

Converted into Static Analysis in the case of Harmonic Steady-State Analysis

-

COORDINATE

-

O

-

-

JOINT

-

O

-

*NODE

LOCAL

ANG

O

-

*LOCALAXIS

AXVEC, PLVEC

O

-

*LOCALAXIS

RESTRAINT

-

O

-

*CONSTRAINT

CONSTRAINT (1)

-

O

-

*RIGIDLINK

WELD

-

X

-

-

PATTERN

-

O

-

-

SPRING

-

O

-

-

MASS

-

O

-

-

MATERIAL (2)

Isotropic

O

-

*MATERIAL

Orthotropic

O

Only one axis converted

*MATERIAL

Anisotropic

O

Only one axis converted

*MATERIAL

FRAME SECTION (3)

Prismatic R, P, B, C, T, A, I, L, 2L Shape Section

O

-

*SECTION

Prismatic General Section

O

-

*SECTION

Prismatic Database Section

X

-

-

Nonprismatic Section

O

-

*SECTION

SHELL SECTION

-

O

-

*THICKNESS

NLPROP (4)

-

O

-

*SPRING
*ELASTICLINK

FRAME

GEN, DEL

O

-

*ELEMENT

LOCAL, ANG, PLVEC

O

-

*ELEMENT

IOFF, JOFF

O

-

*OFFSET

RIGID (5)

O

Converted into 1.0 for a value other than 1.0.

*OFFSET

IREL, JREL

O

-

*FRAME-RLS

SHELL

GEN, DEL

O

-

*ELEMENT

PLVEC,ANG

X

-

-

PLANE

GEN, DEL

O

-

*ELEMENT

3,4 Node element

O

-

*ELEMENT

9 Node element

X

-

-

MATANG

X

-

-

ASOLID

GEN, DEL

O

-

*ELEMENT

3,4 Node element

O

-

*ELEMENT

9 Node element

X

-

-

MATANG, ARC

X

-

-

SOLID

GEN, DEL

O

-

*ELEMENT

6,8 Node element

O

-

*ELEMENT

MATANG

X

-

-

NLLINK (6)

1 Node element

O

-

*SPRING

2 Node element

O

-

*ELASTICLINK

MATTEMP

-

X

-

-

REFTEMP

-

O

-

-

PRESTRESS

-

O

-

*PRESTRESS

LOAD

FORCE

O

-

*CONLOAD

RESTRAINT
DISPLACEMENT

O

-

*SPDISP

SPRING
DISPLACEMENT

O

MIDAS does not have a corresponding command. Converted into Specified Displacement at the closest support.

*SPDISP

GRAVITY (Beam)

O

-

*BEAMLOAD

GRAVITY (Shell)

O

-

*PRESSURE

GRAVITY (Plane/Asolid/Solid)

X

-

-

CONCENTRATED SPAN

O

-

*BEAMLOAD

DISTRIBUTED SPAN

O

-

*BEAMLOAD

PRESTRESS

O

-

*PRESTRESS

UNIFORM

O

-

*PRESSURE

SURFACE PRESSURE

O

-

*PRESSURE

PORE PRESSURE

X

-

-

TEMPERATURE

O

-

*ELTEMPER
*THERGRAD

ROTATE

X

-

-

PDFORCE

-

O

-

*INIFORCE

PDELTA

-

O

-

*PDEL-CTRL

MODES

N,CUT,TOL

O

-

*EIGEN-CTRL

RITZ

O

-

*EIGEN-CTRL

SHIFT

X

-

-

ACC, LOAD, NCYC, NLLINK

X

-

-

FUNCTION

The file being used by FUNCTION must be in the same folder containging *.s2k.

O

If a file is used for FUNCTION, the file must be in the same folder, which contains *.2k.

*SFUNCTION
*TFUNCTION

SPEC

NAME, ANG, DAMP, F1, F2, DIRF,MODC (CQC,SRSS,ABS)

O

-

*SPLDCASE

MODC (GMC)

X

-

-

HISTORY

Linear Transient/
Periodic Analysis

O

-

*THLDCASE

Nonlinear Transient Analysis

X

-

-

Acceleration Data

O

-

*GROUND-ACC

Load Data (7)

O

-

*DYN-SLOAD

LANE

-

O

-

*LINELANE

VEHICLE

DB Vehicle (8)

O

-

*VEHICLE

User Define Vehicle

X

Converted into DB24 vehicle load & a warning issued.

*VEHICLE

VEHICLE CLASS

-

O

-

*VCLASS

BRIDGE RESPONSE

-

X

-

-

MOVING LOAD

NAME, RF, CLASS, LANE, LMIN, LMAX, SF

O

-

*MVLDCASE

CALC

O

-

*MOVE-CTRL

TOL, SET

X

-

-

COMBO

-

O

-

*LOADCOMB

Output

-

X

-

 

END

-

X

-

 

 

 

Notes

 

1. CONSTRAINT

 

¨ Constraint of DIAPH, PLATE, ROD or BEAM Type having Auto Axis is converted into Global Z Axis.

 

¨ The node closest to the center of the constrained nodes defined in SAP2000 is converted into the Master Node in MIDAS.

 

¨ EQUAL and LOCAL are converted into the Rigid Link of MIDAS, and a warning message is generated.

 

 

2. MATERIAL

 

¨ SAP2000 uses Weight Density and Mass Density. If Mass Density exists in the absence of Weight Density, the Mass Density is converted into Weight Density (Weight Density = Mass Density * Gravitational acceleration).

 

¨ When Mass Density exists, the form of Converting Type of Model Weights to Masses of Structure Type in MIDAS is transformed into Convert to X,Y,Z.

 

 

3. FRAME SECTION

 

¨ MPL (Mass Per Length) assigned to Frame Element is converted into Nodal Mass at each end of the element.

 

¨ WPL (Weight Per Length) assigned to Frame Element is converted into Beam Load. The Beam Load is included in the load case containing Gravity Load.

 

 

4. NLPROP

 

¨ Elements pertaining to NLLINK are converted into Elastic Link in MIDAS. Only the linear stiffness of NLPROP is retained.

 

¨ If both KE and K exist, KE is converted into the stiffness of Elastic Link.

 

¨ If K alone exists in the absence of KE, K is converted into the stiffness of Elastic Link.

 

¨ If neither KE nor K exists, 0 is assigned to the stiffness of Elastic Link.

 

 

5. RIGID

 

¨ RIGID in SAP2000 represents the Factor of Rigidity in the Offset part defined in Frame. 1 and 0 signify Fully Rigid and Fully Flexible respectively. MIDAS permits only the Fully Rigid case.

 

 

6. NLLINK

 

¨ 1-node NLLINK is converted into Spring support and 2-node NLLINK is converted into Elastic link.

 

 

7. Load Data

 

¨ Dynamic Nodal Load in MIDAS is defined by applying loads at specific nodes, whereas Static Load Case is assigned in SAP2000 for such loads. If nodal loads exist in Static Load Case, Load Function is assigned to the corresponding nodes. If no such nodal loads exist in Static Load Case, no conversion is carried out and a warning message is generated.  

 

 

8. Vehicle loads

 

¨ Convertible Vehicle loads: COOPERE80, P5, P7, P9, P11, P13, AML

 

¨ Vehicle loads not converted: HL-93M, HL-93K, HL-93S, RL, HN-44, HSN-44, HN-44L, HSN-44L

 

¨ Converted into DB24 Load and a warning message is generated.

 

 

SAP2000(V8) File

**Target File: Unmodified *.s2k file created by Export in SAP2000(V8) can be converted.

Contents

Table

Conversion

MIDAS

Remarks

Joint

Summary - Joint Assignments

O

-

 

Joint Coordinates

O

*NODE

 

Joint Restraint Assignments

O

*CONSTRAINT

 

Joint Local Axes Assignments 1 - Typical

O

*LOCALAXIS

 

Joint Local Axes Assignments 2 - Advanced

O

*LOCALAXIS

 

Joint Pattern Assignments(1)

O

-

 

Joint Pattern Definitions(1)

O

-

 

Joint Spring Assignments 1 - Uncoupled

O

*SPRING

 

Joint Spring Assignments 2 - Coupled

O

*GSPRING

*GSPRTYPE

 

Joint Panel Zone Assignments

X

- N/A

 

Frame

Summary - Frame Assignments

O

 

 

Connectivity - Frame/Cable

O

*ELEMENT

 

Frame Cable Assignments

X

 

 

Frame Design Procedures

X

 

 

Frame Insertion Point Assignments

O

*SECTION

 

Frame Local Axes Assignments 1 - Typical

O

*ELEMENT

 

Frame Local Axes Assignments 2 - Advanced

O

*ELEMENT

 

Frame Material Temperatures

X

- N/A

 

Frame NL Hinge Assignments

X

 

 

Frame Offset Along Length Assignments(2)

O

*OFFSET

 

Frame Output Station Assignments

X

- N/A

 

Frame P-Delta Force Assignments

O

*INIFORCE

 

Frame Prestress 1 - Patterns

O

*PRESTRESS

 

Frame Prestress 2 - Load Multipliers

O

*PRESTRESS

 

Frame Property Modifiers

O

*SECT-SCALE

 

Frame Reference Temperatures

O

*ELTEMPER

 

Frame Release Assignments 1 - General(3)

O

*FRAME-RLS

 

Frame Release Assignments 2 - Partial Fixity(3)

*FRAME-RLS

 

Frame Spring Assignments(4)

*SPRING

 

Frame Auto Subdivision Assignments

X

- N/A

 

Frame Tension And Compression Limits

X

-

 

Area

Summary - Area Assignments

O

 

 

Connectivity - Area(5)

O

*ELEMENT

 

Area Auto Mesh Assignments

X

- N/A

 

Area Local Axes Assignments 1 - Typical(6)

X

- Undefined

 

Area Local Axes Assignments 2 - Advanced(6)

X

- Undefined

 

Area Material Temperatures

X

- N/A

 

Area Reference Temperatures

O

*ELTEMPER

 

Area Spring Assignments(5)

*SPRING

 

Solid

Summary - Solid Assignments

O

-

 

Connectivity - Solid

O

*ELEMENT

 

Solid Local Axes Assignments 1 - Typical(6)

X

- Undefined

 

Solid Local Axes Assignments 2 - Advanced(6)

X

- Undefined

 

Solid Material Temperatures

X

- N/A

 

Solid Property Assignments

X

- N/A

 

Solid Property Definitions

X

- N/A

 

Solid Reference Temperatures

O

*ELTEMPER

 

Solid Spring Assignments(4)

X

- Undefined

 

Solid Auto Mesh Assignments

X

- N/A

 

Link

Summary - Link Assignments

O

-

 

Connectivity - Link

O

*ELASTICLINK,
*NL-LINK

 

Link Local Axes Assignments 1 - Typical

O

*ELASTICLINK,
*NL-LINK

 

Link Local Axes Assignments 2 - Advanced

O

*ELASTICLINK,
*NL-LINK

 

Link Property Definitions 01 - General

O

*NL-PROP

 

Link Property Definitions 02 - Linear

O

*NL-PROP

 

Link Property Definitions 03 - MultiLinear

X

- N/A

 

Link Property Definitions 04 - Damper

O

*NL-PROP

 

Link Property Definitions 05 - Gap

O

*NL-PROP

 

Link Property Definitions 06 - Hook

O

*NL-PROP

 

Link Property Definitions 07 - Rubber Isolator

O

*NL-PROP

 

Link Property Definitions 08 - Sliding Isolator

O

*NL-PROP

 

Link Property Definitions 09 - Plastic (Wen)

O

*NL-PROP

 

Link Property Definitions 10 - Plastic (Kinematic)

X

- N/A

 

Link Property Assignments

O

*NL-PROP

 

 

Program Control

O

*UNIT

 

MATERIAL

Material Properties 1 - General

O

*MATERIAL

 

Material Properties 2 - Advanced

*MATERIAL

- anisotropic

Material Properties 3 - Design Steel

X

-

 

Material Properties 4 - Design Concrete

X

-

 

Material Properties 5 - Design Aluminum

X

 

 

Material Properties 6 - Design ColdFormed

X

 

 

SECTION

Frame Section Assignments

O

*SECTION

 

Frame Section Properties 1 - General

O

*SECTION
*SECT-SCALE

 

Frame Section Properties 2 - Concrete Column

X

 

 

Frame Section Properties 3 - Concrete Beam

X

 

 

Frame Section Properties 4 - Auto Select

X

 

 

Frame Section Properties 5 - Nonprismatic

*SECTION

- sect. scale

Thickness

Area Section Properties

O

*THICKNESS

 

Area Stiffness Modifiers

O

- N/A

 

Static

Load

Case

Joint Loads - Force

O

*CONLOAD

 

Joint Loads - Ground Displacement

O

*SPDISP

 

Frame Loads - Distributed

O

*BEAMLOAD

 

Frame Loads - Gravity(7)

O

*BEAMLOAD

- SelfModifier

Frame Loads - Point

O

*BEAMLOAD

 

Frame Loads - Temperature(8)

O

*ELTEMPER
*THERGRAD
*NDTEMPER

- Joint Pattern

Area Loads - Gravity(7)

O

*PRESSURE

- SelfModifier

Area Loads - Pore Pressure

X

- N/A

 

Area Loads - Rotate

X

- N/A

 

Area Loads - Surface Pressure

O

*PRESSURE

 

Area Loads - Temperature(8)

O

*ELTEMPER,*THERGRAD

 

Area Loads - Uniform To Frame

X

- Lack of data

- FLOADTYPE
- FLOORLOAD

Area Loads - Uniform

O

*PRESSURE

- Joint Pattern

Area Loads - Wind Pressure Coefficients

X

- Undefined

 

Solid Loads - Gravity(7)

X

- Undefined

- SelfModifier

Solid Loads - Pore Pressure

X

- N/A

 

Solid Loads - Surface Pressure

X

- Undefined

 

Solid Loads - Temperature(8)

O

*ELTEMPER
*THERGRAD

 

Link Loads - Gravity(7)

X

- N/A

 

Case - Static 1 - Load Assignments

O

*STLDCASE

 

Load Case Definitions

O

*STLDCASE

 

LOAD

Bridge Loads 1 - Lane Definitions

O

*LINELANE

- Both
- Independent

Bridge Loads 2 - Standard Vehicles

O

*VEHICLE

 

Bridge Loads 3 - General Vehicles 1

O

*VEHICLE

 

Bridge Loads 4 - General Vehicles 2

O

*VEHICLE

 

Bridge Loads 5 - Vehicle Classes

O

*VCLASS

 

Bridge Loads 6 - Bridge Response

O

*VEHICLE

 

Case - Moving Load 1 - Lane Assignments

O

*MVLDCASE

 

Case - Moving Load 2 - Lanes Loaded

O

*MVLDCASE

 

Case - Moving Load 3 - MultiLane Factors

O

*MVLDCASE-

 

 

Combination Definitions

O

*LOADCOMB

 

Eigen

Value

Problem

Masses 1 - Mass Source

O

*LOADTOMASS

 

Masses 2 - Assembled Joint Masses

X

- Generated after analysis

 

Joint Added Mass Assignments

O

*NODALMASS

 

Frame Added Mass Assignments(9)

*NODALMASS

 

Area Added Mass Assignments(9)

*NODALMASS

 

Case - Modal 1 - General

O

*EIGEN-CTRL

 

Case - Modal 2 - Load Assignments - Eigen

X

- N/A

 

Case - Modal 3 - Load Assignments - Ritz

O

*EIGEN-CTRL

 

Response

Spectrum

Analysis

Function - Response Spectrum - BOCA96

X

- N/A

 

Function - Response Spectrum - EuroCode8

O

*SFUNCTION

 

Function - Response Spectrum - From File

X

- N/A

 

Function - Response Spectrum - IBC2000

O

*SFUNCTION

 

Function - Response Spectrum - NBCC95

O

*SFUNCTION

 

Function - Response Spectrum - NEHRP97

X

- N/A

 

Function - Response Spectrum - NZS4203

X

- N/A

 

Function - Response Spectrum - UBC94

O

*SFUNCTION

 

Function - Response Spectrum - UBC97

O

*SFUNCTION

 

Function - Response Spectrum - User

O

*SFUNCTION

 

Case - Response spectrum 1 - General(10)

O

*SPEC-CTRL
*SPLDCASE

 

Case - Response spectrum 2 - Load Assignments(10)

O

*SPLDCASE

 

Case - Response spectrum 3 - Interpolated Damping

X

- N/A

 

Case - Response spectrum 4 - Proportional Damping

X

- N/A

 

Case - Response spectrum 5 - Damping Overrides

X

- N/A

 

Analysis

Analysis Case Definitions

O

*ANAL-CTRL

 

Active Degrees of Freedom

O

*STRUCTYPE

 

Case - Static 2 - Nonlinear Load Application

X

 

 

Case - Static 3 - Nonlinear Stage Information

X

- Lack of data

*STAGE

Case - Static 4 - Nonlinear Parameters

X

- Lack of data

*STAGE
*NONL-CTRL

Case - Direct History 1 - General(11)

O

*THLDCASE

 

Case - Direct History 2 - Load Assignments

O

*GROUND-ACC
*DYN-SLOAD

 

Case - Direct History 3 - Proportional Damping

O

*THLDCASE

 

Case - Direct History 4 - Integration Parameters

X

- N/A

 

Case - Direct History 5 - Nonlinear Parameters

O

*THLDCASE

 

Case - Modal History 1 - General

O

*THLDCASE

 

Case - Modal History 2 - Load Assignments

O

*GROUND-ACC
*DYN-SLOAD

 

Case - Modal History 3 - Interpolated Damping

X

- N/A

 

Case - Modal History 4 - Proportional Damping

O

*THLDCASE

 

Case - Modal History 5 - Damping Overrides

O

*THLDCASE

 

Case - Modal History 6 - Nonlinear Parameters

O

*THLDCASE

 

Case - Buckling 1 - General(12)

O

*BUCK-CTRL

 

Case - Buckling 2 - Load Assignments

O

*BUCK-CTRL

 

Case - Steady State 1 - General

X

 

 

Case - Steady State 2 - Load Assignments

X

 

 

Rigid Link

Joint Constraint Assignments(13)

O

*RIGIDLINK

 

Constraint Definitions - Beam

*RIGIDLINK

- Auto Axes

Constraint Definitions - Body

O

*RIGIDLINK

 

Constraint Definitions - Diaphragm

*RIGIDLINK

- Auto Axes

Constraint Definitions - Equal

O

*RIGIDLINK

 

Constraint Definitions - Line

O

*RIGIDLINK

 

Constraint Definitions - Local

X

- N/A

 

Constraint Definitions - Plate

*RIGIDLINK

- Auto Axes

Constraint Definitions - Rod

*RIGIDLINK

- Auto Axes

Constraint Definitions - Weld

O

*RIGIDLINK

 

Lateral

Load

(Wind)

Auto Wind - ASCE7-88

X

- N/A

 

Auto Wind - ASCE7-95

X

- N/A

 

Auto Wind - ASCE7-98

O

*WIND

 

Auto Wind - BOCA96

X

- N/A

 

Auto Wind - BS6399-95

X

- Lack of data

 

Auto Wind - NBCC95

O

*WIND

 

Auto Wind - UBC94

X

- N/A

 

Auto Wind - UBC97

O

*WIND

 

Auto Wind - User

X

- N/A

 

Auto Wind Exposure For Horizontal Diaphragms

X

- N/A

 

Auto Wind Loads To Groups

X

- N/A

 

Auto Wind Loads To Horizontal Diaphragms

X

- N/A

 

Auto Wind Loads To Joints

X

- N/A

 

Lateral

Load

(Seismic)

Auto Seismic - BOCA96

X

- N/A

 

Auto Seismic - IBC2000

X

- Lack of data

- Seismic Group

Auto Seismic - NBCC95

O

*SEIS

 

Auto Seismic - NEHRP97

X

- N/A

 

Auto Seismic - UBC94

X

- N/A

 

Auto Seismic - UBC97

O

*SEIS

 

Auto Seismic - UBC97 Isolated

X

- N/A

 

Auto Seismic - User Coefficient

X

- N/A

 

Auto Seismic - User Loads

X

- N/A

 

Auto Seismic Eccentricity Overrides

X

- N/A

 

Auto Seismic Loads To Groups

X

- N/A

 

Auto Seismic Loads To Horizontal Diaphragms

X

- N/A

 

Auto Seismic Loads To Joints

X

- N/A

 

Time

History

Functions

Function - Time History - Cosine

X

- N/A

 

Function - Time History - From File

O

*TFUNCTION

 

Function - Time History - Ramp

X

- N/A

 

Function - Time History - Sawtooth

X

- N/A

 

Function - Time History - Sine

X

- N/A

 

Function - Time History - Triangular

X

- N/A

 

Function - Time History - User

O

*TFUNCTION

 

Function - Time History - User Periodic

X

- N/A

 

COMBO

Groups 1 - Definitions

X

 

 

Output

Groups 2 - Assignments

X

- Lack of data

*GROUP
*BNDR-GROUP

END

Groups 3 - Masses and Weights

X

 

 

 

 

Notes

 

Commentary

 

1. Joint Pattern

¨ For the present, it is applied to Element Temperature Load, Temperature Gradient and Area Surface Load.

 

2. Beam End Offset

 

¨ No Rigid Factor function

 

Note
Converted into Fully Rigid Offset

 

3. Beam End Release

 

¨ SAP inputs Partial Fixity as Stiffness whereas MIDAS inputs it as Proportion in the case of Frame Release.

 

Note
Converted into Full Fixity

 

4. Element Spring

 

¨ Frame Spring Assignment: Converted into Node Spring

 

¨ Area Spring Assignment: Converted into Node Spring (only in the case of face#5 and #6 (¡ñlocal axes))

 

¨ Solid Spring Assignment: Not converted since local axes are not defined

 

5. Area element

SAP2000(V8)

MIDAS/Gen

Remark

Section-Type

sub-type

Element

type

Shell

Shell

Thick

Plate(5-1)

Thick

 

Thin

Thin

 

Membrane

Plane Stress(5-2)

 

Plate

Thick

Plate

Thick

Consistent Element Properties

Thin

Thin

Plane

Stress

Plane

Stress

Consistent Element Properties

Strain

Strain

Asolid

Axisymmetric solid

Consistent Element Properties

 

5-1. In SAP 2000, Shell-Shell Element is the combination of Shell-Membrane Element and Shell-Plate Element, and the element has both translational and rotational degrees of freedom in ECS (element coordinate system) x, y, and z directions. In MIDAS/Gen, however, since there is no corresponding element to Shell-Shell Element of SAP 2000, it is converted into Plate Element.

5-2. In SAP 2000, Shell-Membrane Element has translational degrees of freedom in two in-plane directions and a rotational degree of freedom (drilling moment) perpendicular to the plane. As the counterpart of MIDAS/Gen, Wall-Membrane Element may be used. But it has a limitation in that the nodes of Wall-Membrane Element have to be connected counterclockwise starting from the bottom left and the element must be parallel to the Global Z-axis. Due to the limitations, the Shell-Membrane Element of SAP2000 is replaced with the Plane-Stress Element of MIDAS, which has only translational degrees of freedom in two in-plane directions.

 

 

6. Local Axes

 

¨ Area Local Axes: SAP - default: Identical to GLOBAL Axes

 

MIDAS - default: Local Axes are defined by the sequence of nodes.

 

SAP2000 (default:GLOBAL)

MIDAS/Gen

Ex(1)

 

 

Ex(2)

 

 

 

 

 

 

7. Gravity Load

 

¨ Frame: Converted into Element Beam Load (*if self modifier > 0, self weight is applied)

 

¨ Area: Converted into Pressure Load (in the direction of Global Axes of face#5, #6 since local axes are not defined)

 

¨ Solid: Not converted since local axes are not defined

 

8. Temperature Load

 

¨ Frame Temperature Load

 

¨ It is converted into Nodal Temperature if Joint Pattern exists. The average of Joint Pattern is converted into Element Temperature Load.

 

¨ Frame Temperature Gradient

 

¨ Neglect Pattern if Joint Pattern exists.

 

¨ Area Temperature load

 

¨ It is converted into Nodal Temperature if Joint Pattern exists. The average of Joint Pattern is converted into Element Temperature Load.

 

¨ Area Temperature Gradient

 

¨ Neglect Pattern if Joint Pattern exists.

 

¨ Solid Temperature Load

 

¨ It is converted into Nodal Temperature if Joint Pattern exists. The average of Joint Pattern is converted into Element Temperature Load.

 

9. Added Mass

 

¨ Frame Added Mass -> Converted into Nodal Mass  

 

¨ Area Added Mass -> Converted into Nodal Mass

 

10. Response Spectrum Analysis Control

 

¨ It is possible to assign Analysis Control for every Response Spectrum Load Case in SAP, but in MIDAS only one Analysis Control can be assigned. So only the first Analysis Control is converted.

 

11. Time History Load Case

 

¨ Among Direct Integration Analysis Method, only Newmark method's  parameter can be converted.

 

12- Buckling Analysis Control

 

¨ It is possible to assign Buckling Analysis Control for every load case in SAP, but in MIDAS only one Analysis Control can be assigned. So only the first Analysis Control can be converted.

 

¨ It is converted only when Load Type is "Load Case" in SAP.

 

13. Rigid Link

 

¨ Master node is assigned to the first Slave node.

 

¨ In the case of Diaphragm and Plate, node (center of mass) to which mass is added is assigned as Master node.

 

¨ Beam, Diaphragm, Plate and Rod: They are not converted after processing Auto Axis Message.

 

14. Miscellaneous

 

- Section Offset and Beam End Offset cannot be taken into account simultaneously.

 

  Global Type and Element Type of Beam End Offset cannot be taken into account simultaneously.

 

- Frame Auto Subdivision

 

¨ Not converted

 

- Area Auto Mesh

 

¨ Not converted

 

 

STAAD2000/2002 File

Checklist

 

1. Target files to be converted (*.std) are restricted to the files, which were opened from and saved in the STAAD program.

 

2. Abbreviated commands are not supported (ex. SECTION => SEC: not supported; abbreviated commands not to be used in carrying out No. 1).

 

3. The conversion in the current version is limited to the data related to static analysis.

STAAD
command

Detail command

Conversion

Limitation

MIDAS/Gen function

Unit

-

O

- Converted into Neutral Unit System (Newton, Meter)

*UNIT

Joint Coordinate

JOINT
COORDINATE

O

-

*NODE

JOINT
COORDINATE
CYLINDRICAL Or CYLINDRICAL REVERSE

X

- To be upgraded in a Future Version

REPEAT

O

-

REPEAT ALL

O

-

Member Incidence

MEMBER INCIDENCE

O

- If SHELL and SOLID have the same ID, it prints out a warning message, reassigns IDs to them and then converts them.

*ELEMENT
( Beam, Truss )

REPEAT

O

REPEAT ALL

O

Element Incidence (Shell)

ELEMENT INCIDENCE (SHELL)

O

- If MEMBER and SOLID have the same ID, it prints out a warning message, reassigns IDs to them and converts them.

*ELEMENT
( Plate, Plane Stress)

REPEAT

O

REPEAT ALL

O

Element Incidence Solid

ELEMENT INCIDENCE SOLID

O

- If MEMBER and SHELL have the same ID, it prints out a warning message, reassigns IDs to them and then converts them.

*ELEMENT
( Solid )

REPEAT

O

REPEAT ALL

O

Element Mesh Generation

-

X

-

-

Redefined of
Joint and Member Numbers

-

X

-

-

Groups

GEOMETRY

O

- Nodes and Elements with corresponding IDs  Convert into the MIDAS GROUP Command

*GROUP

JOINT

O

-

MEMBER

O

-

ELEMENT

O

-

SOLID

O

-

Rotate of Structure Geometry

-

X

-

-

Inactive/Delete Specification

-

X

-

-

Start User Table

External File Name

X

- User Section Table using files is not converted.

-

TYPE

O

-

*SECTION

NAME

O

-

PROPERTY

O

-

Member Properties

DB Section

- Only AISC DB can be converted

-

PRISMATIC

O

- Converted into Value Type if Property (AX, AY, AZ, IX, IY, and IZ) is present.
- Trapezoidal Shape is converted into Rectangular Shape.

*SECTION

TAPERED

O

-

UPTABLE

O

- User Table input using files is not converted

ASSIGN

X

- Cannot convert into a command that automatically assigns sections after analysis and design.
- Arbitrary IDs are assigned to corresponding elements after printing out a warning message (assign #1)

-

Element Properties

-

O

- Only f1 is converted.

- A warning message is printed out if f2…f4 (Thickness at other nodes of the element) exist.

*THICKNESS

Define Material

E, G, POISSON, DENSITY, ALPHA

O

- Only Material used in CONSTANT Command is converted. Converted after arbitrary Material Name and IDs are assigned.

*MATERIAL

DAMPING,CDAMP

X

-

Constant

E, G, POISSON, DENSITY, ALPHA

O

- Only Material used in CONSTANT Command is converted. Converted after arbitrary Material Name and IDs are assigned. Converted into values if CONCRETE, STEEL and ALUMINUM are used.

*MATERIAL

CDAMP

X

-

 

BETA, REF, REFJT

O

-

 

Member Truss

-

O

-

*ELEMENT

Member Cable

-

O

-

*ELEMENT

Member Tension

-

O

-

*ELEMENT

Member Compression

-

O

-

*ELEMENT

Element Plane Stress(1)

-

O

- ELEMENT TYPE is assigned as Plane Stress.

*ELEMENT

Element Ignore (Inplane Rotation)(1)

-

O

-

*ELEMENT

Support

INCLINED

X

- To be upgraded

-

FOOTING

X

-

-

ELASTIC MAT

X

-

-

FX, FY, FZ, MX, FY, MZ

O

-

*CONSTRAINT

KFX, KFY, KFZ, KMX, KMY, KMZ

O

-

*SPRING

Member Offsets

LOCAL

X

-

-

GLOBAL

O

Converted into DB24 vehicle load & a warning issued.

*OFFSET

Member Release

Partial Moment Release

X

-

-

Release other than Partial Moment

O

-

*FRAME-RLS

Master / Slave

-

O

- Not converted when slave nodes are assigned using XRANGE, YRANGE and ZRANGE (to be upgraded)

*RIGIDLINK

Loading

-

O

- MIDAS uses Name for defining load cases. “LDC Load Case Numbers” define the names of converted load cases.

*STLDCASE

Joint Load

-

O

-

*CONLOAD

Member Load

UNI or UMOM

O

- f4 value (Perpendicular distance from the member shear center to the plane of loading) is not converted.
- Loads input in X, Y and Z Axes (Local Axes) are converted into Loads in the Global Axes.

*BEAMLOAD

CON or CMOM

O

*BEAMLOAD

LIN

O

*BEAMLOAD

TRAP

O

*BEAMLOAD

Element Load

PRESSURE

O

- Element Concentrated Load prepared with the input of only x1 and y1 is not converted.
- Loads applied to certain points of element with the input of x1, y1, x2 and y2 are not converted.

*PRESSURE

TRAP

O

-

*PRESSURE

Area Load

-

X

-

-

Floor Load

-

X

-

-

Prestress Load

PRESTRESS

O

-

*PRESTRESS

POSTSTRESS

Fixed End Load

-

X

-

-

Support Displacement

-

O

-

*SPDISP

TEMPERAURE LOAD

-

X

-

 

SELFWEIGHT

-

O

-

*SELFWEIGHT

SPECTRUM

-

X

- To be upgraded

 

TIME LOAD

-

X

- To be upgraded

 

REPEAT LOAD

-

X

 

 

LOAD GENERATION

-

X

 

 

UBC LOAD

-

X

 

 

WIND LOAD

-

X

 

 

CALCULATE NATURAL

-

X

- To be upgraded

 

MODAL

-

X

- To be upgraded

 

LOAD COMBINATION

Linear Combination

O

-

*LOADCOMB

SRSS

O

- If LOAD CASE Number is a negative number, SRSS and Linear Combination coexist. In such a case, SRSS Combination and Linear Combination are created as separate LOAD COMBINATIONs (LCBSRSS and LCBADD) respectively, and then they become Sub Combinations of a NEW COMBINATION.

 

 

Notes

 

Commentary

 

1. Shell element

STAAD2000/2002

MIDAS/Gen

Remark

Element

type

Element

type

Shell

Default

Plate(1-1)

Thick

 

Plane Stress

Plane Stress

Consistent Element Properties

IGNORE
(INPLANE ROTATION)

Plate

Thick

Consistent Element Properties

 

1-1. In STAAD 2000, Shell Element has both translational and rotational degrees of freedom in ECS (Element Coordinate System) x, y and z directions. In MIDAS/Gen, however, since there is no corresponding element to Shell Element of STAAD 2000, Plate Element is used instead.