new gen fx 2014 release note - cspfea · new gen fx 2014 release note integrated design system for...

Gen 2014 Gen 2014 (v1.1) Release Note

New Gen Fx 2014 Release Note Integrated Design System for Building and General Structures

Enhancements

(1) Accidental eccentricity for the flexible floor diaphragm in the response spectrum analysis

(2) Addition of Singapore National Annex in Eurocode

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

(4) Improvements on Eurocode Load Combination

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

(6) Same Beam Rebar at Joints

(7) Cracked Section Stress in GSD

(8) Damping Constant in Surface Spring Support

Analysis & Design

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

Design (1) Continuous beam strip footing design

(2) Combined wall design

(3) General column design

New powerfull 3D Modeler and Mesher

Midas Gen FX 2014 Release Note

• È il modellatore solido 3D geometrico dei solutori Midas: la qualità e la potenza dei migliori modellatori per la

meccanica è finalmente al servizio dell’ingegneria civile! Interfaccia grafica per la generazione parametrica di curve

2D-3D, superfici, solidi. Infiniti livelli di undo e redo parametrici. Operazioni di editing della geometria: unione,

intersezione, extrude, revolve, loft, sweep, fillet, chamfer, offset, draft, shell, local prisme su tutte le geometrie.

1. New powerfull 3D modeler and mesher

Varie opzioni di meshing


1. Accidental eccentricity for the flexible floor diaphragm in the response spectrum analysis

• In the previous version, the accidental eccentricity could not be considered in case of flexible floor diaphragm when

performing response spectrum analysis. Now, it is supported in a following way:

• Accidental torsion is considered for each individual masses, instead of total masses.

• Accidental torsion is calculated by the product of inertia force and accidental eccentricity at each masses and applied as a

static load case.

• For a given earthquake, the program selects the absolute maximum accidental torsion among four cases of eccentricities by

each masses. Positive and negative eccentricity for the earthquake direction. Positive and negative eccentricity for the

direction orthogonal to earthquake direction.

Model > Building > Story

Load > Response Spectrum Analysis Data > Response Spectrum Load Cases


2. 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 as 1.194kg/m3.

• Response Spectrum Function and Static Seismic Load as per NA to SS EN 1998-1:2013 is implemented. In Singapore National 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.

Material Properties Static Wind Load Response Spectrum Function


• 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.

Results > Combinations

Design > Concrete Design Parameter > Design Code

Design > Steel Design Parameter > Design Code

Concrete Code Design Steel Code Checking & Optimal Design


3. 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

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


4. 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

Load Combination

Category B: Office Area

Category D: Shopping Area

5. 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

Punching Shear Check


6. 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

Equalize Beam Rebar Data


7. 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 Designer

Cracked Section Stresses in midas GSD

Cross Section at Crack

Transformed Section

Strain Distribution

Stress Distribution

Cracked Elastic Behavior


8. 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.

Model > Boundaries > Surface Spring Supports

Model > Boundaries > Point Spring Supports


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 >

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


2. Addition of Group Column in Elastic Link Result Table

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

3. Unit Option for Tables and Graphs in Dynamic Report

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

Result > Result Tables > Elastic Link

Elastic Link Result Table

Tools > Dynamic Report Generator

Table/Chart Unit Dialog Box


1. Continuous beam strip footing design

• Continuous Beam Strip footing (or CBS footing) is generally constructed on the soft ground and used where longitudinal

bending moments are a major problem for the foundation design.

• CBS footing and ground resistance are modeled by beam elements and Point Spring Supports, respectively in midas Gen.

• CBS footing is designed / checked as per EN 1992-1-1 in the new design module, midas Design +.

Tools > midas Design +

Modeling and analysis in midas Gen

Design/Check in midas Design +

Member dimensions and forces are automatically exported to midas Design +.


• The dimension of Continuous Beam Strip footing is determined as follows:

1) The rectangular beam marked in red is designed from the longitudinal moment and shear.

2) The bottom width of strip footing is determined from allowable bearing pressure which is

entered by user.

3) The thickness and reinforcements in the cantilever are determined from the moments and

shear forces due to soil pressure which is taken from the soil pressure calculated by the program.


• Footing reinforcement drawings are provided.


• Reinforcement quantities in a table format and detailed calculation report in a word format


2. Combined wall design

• In the previous version, only straight wall elements were designed/checked individually. Now, combined wall elements (L-, T-,

U-, I-, etc) can be checked as integral units as per EN 1992-1-1.

• Combined walls are modeled and analyzed by wall elements assigned same wall ID in midas Gen.

• Combined walls are checked as per EN 1992-1-1 in the new design module, midas Design +.


Modeling and analysis in midas Gen

Code check in midas Design +



• The typical procedure is as follows:

midas Gen

1. Create combined walls and perform analysis.

2. Generate load combinations.

midas Design +

1. Import member forces (Axial force, moments and shear forces), cross-section and height of walls.

2. Moment magnification due to second order effect.

3. Define longitudinal reinforcement and shear reinforcement.

4. Calculate effective width of flange as per 5.4.3.4.1 of EN 1998-1. For the calculation of flexural resistance, the effective

flange width on each side of a web is taken to extend from the face of the web by the minimum of:

a) The actual flange width

b) One-half of the distance to an adjacent web of the wall and

c) 25% of the total height of the wall above the level considered

5. Design of combined wall - Bending with axial force using P-M interaction

diagram generated as per 6.1 of EN 1992-1-1

6. Design of combined wall - Shear as per 6.2 Shear of EN 1992-1-1. It is

assumed that shear forces will be resisted only by the walls which are

parallel to the shear force.

7. Check detailing of walls as per 9.6 of EN 1992-1-1.


• Combined wall reinforcement drawings are provided.


• Reinforcement, concrete quantities and form area are provided in a table format.


3. General column design

• Columns with general or non-typical shape of cross-section can be checked as per EN 1992-1-1.

• General columns are modeled and analyzed in midas Gen.

• General columns are checked as per EN 1992-1-1 in the new design module, midas Design +.


Code check in midas Design +

P-M interaction curve in midas Design +



• General column reinforcement drawings are provided.


• Reinforcement, concrete quantities and form area are provided in a table format.


new gen fx 2014 release note - cspfea · new gen fx 2014 release note integrated design system for...

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