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Comparison of MIDAS/Civil V.670

and RM2004

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.ContentsContents

• MIDAS/Civil Analysis Features

• MIDAS/Civil vs. RM2004

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.MIDAS/Civil Analysis Feature (1)MIDAS/Civil Analysis Feature (1)

• MIDAS provides PSC or STEEL section shapes and auto-calculated section properties

• MIDAS considers variations in structural system and loading conditions for each construction stage

• MIDAS analyzes Composite Sections

• MIDAS provides various PSC Bridge Wizards for different construction methods- FCM (Balanced Cantilever), ILM, FSM, MSS

• MIDAS reflects creep and shrinkage in Time Dependent Analysis

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.MIDAS/CivilMIDAS/Civil Analysis Feature (2)Analysis Feature (2)

• Cable elements - Catenary, Equivalent truss (Ernst eq.)

• Linearized finite displacement analysis

(Member forces at the final stage converted into initial forces)

• Finite displacement analysis for each construction stage

(P-delta analysis)

• Linear buckling analysis

• Forward/backward stage analysis reflecting geometric nonlinearity

(large displacement analysis)

• Fabrication/construction cambers (Real Disp.)

• Pushover/Inelastic Time History Analysis

• Multiple Support Excitation

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.MIDAS/Civil Analysis Feature (3)MIDAS/Civil Analysis Feature (3)

Construction StageConstruction StageConstruction StageConstruction Stage

Unknown Load FactorUnknown Load FactorUnknown Load FactorUnknown Load Factor

CheckCheckCheckCheck

Apply unit Pretension loads

Construction StageConstruction StageConstruction StageConstruction Stage

- Set constraints

- Calculate unknown load factors for each stage

- Modify unknown load factors by using influence matrix if necessary

Re-analyze construction stages reflecting unknown load factors

Verify analysis results for each stage

EndEndEndEnd

Construction Stage Analysis

• Calculation of initial cable forces of a cable stayed bridge at the final stage/construction stages (Unknown Load Factors)

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Definition of Unknown Load Factors

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.MIDAS/Civil Analysis Feature (4)MIDAS/Civil Analysis Feature (4)

- Cable pretension forces controlled by the user

- In general analysis, applied cable forces are redistributed, becoming different from pretension loads.

- With the selection of ‘External Force’, cable forces become equal to pretension loads.

• Cable-Pretension Force Control

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• Forward Stage Analysis incorporating Large Displacement Analysis

• Forward Stage Analysis reflecting P-delta Effects

• Backward Stage Analysis for cable stayed bridge/suspension bridge by substituting internal forces with member forces at the final stage (applicable when catenary elements are used)

MIDAS/Civil Analysis Feature (5)MIDAS/Civil Analysis Feature (5)

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• 1st Configuration Analysis – Simplified Method proposed by Ohtsuki

- Using equilibrium equation determined by bridge selfweight and main cable forces

Initial Configuration Analysis for Suspension Bridge (Earth-anchored/Self-anchored)

MIDAS/Civil Analysis Feature (6)MIDAS/Civil Analysis Feature (6)

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• 2nd Configuration Analysis (Refined Method)

- Applicable to SELF-ANCHORED suspension bridge

- Initial configuration analysis based on cable coordinates/unstressed lengths/horizontal cable forces resulting from the 1st configuration analysis

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.MIDAS/Civil vs. RM2004 (1)MIDAS/Civil vs. RM2004 (1)

-Basic module-Basic moduleMIDAS/Civil RM2004

-Versatile modeling features / Swift modeling

by Wizards- Modeling by using GP2004

-Can consider variations of structural system

and loading conditions in construction stages- Same as MIDAS

-Can calculate section properties of irregular

sections-Can accurately calculate torsional constant

and shear stress

- Same as MIDAS

- Can define a reference position by top fiber, bottom fiber, centroid, etc. of a section (easy-to-model a tapered section)

- Same as MIDAS

-Moving load analysis by influence lines &

surfaces-Moving loads as per each country code

(AASHTO, BS, CSA, Indian, Taiwan, etc.)-Easy-to-find maximum load case by using

moving load tracer

- Moving load analysis by using influence

lines or advancing static moving loads by a

specific spacing- Moving loads as per each country code- Not easy to find the maximum load case

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.MIDAS/Civil vs. RM2004 (2) MIDAS/Civil vs. RM2004 (2) -Prestressed Concrete module-Prestressed Concrete module

MIDAS/Civil RM2004-Provides various WIZARDs pertaining to

construction methods (FSM, MSS, ILM, FCM)

-Provides PRE-PROCESSOR pertaining to

ILM construction method

- Provides torsional constant of PSC section - Same as MIDAS

-Tendon placement in a 3D space (at any

locations of a section)- Same as MIDAS

- Considers the effects of creep & shrinkage - Same as MIDAS

- Analysis reflecting the effects of prestress

induced at each construction stage - Analysis of redistribution of internal forces

reflecting creep and shrinkage (transverse

bending)

- Same as MIDAS

-Simultaneous application of the above

along with geometric nonlinear analysis

-Produces incremental member forces and

displacements for the current stage and

accumulated member forces and displacements

- Same as MIDAS

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.MIDAS/Civil vs. RM2004 (3) MIDAS/Civil vs. RM2004 (3)

-Composite module-Composite moduleMIDAS/Civil RM2004

- Analysis of composite section - Same as MIDAS

-Considers the effects of creep and shrinkage

due to staged construction and maturity even

within a cross-section

- Same as MIDAS

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.MIDAS/Civil vs. RM2004 (4) MIDAS/Civil vs. RM2004 (4)

- Cable Stayed/Suspension Bridge module- Cable Stayed/Suspension Bridge module

MIDAS/Civil RM2004-Consideration of CABLE SAG (equivalent truss,

catenary)

-Consideration of CABLE SAG (equivalent truss)

- Large displacement analysis for each

construction stage (forward/backward)- P-DELTA analysis for each construction

stage (forward)

- Linearized finite displacement theory

- Backward only

- Same as MIDAS

- Same as MIDAS

- Produces pretension, at each construction

stage, satisfying constraint conditions at the

final stage in cable stayed bridge analysis

(Unknown Load Factors)

- Same as MIDAS (KASP/ADDCON)

- Under development - Performs time-dependent analysis due to

creep & shrinkage and P-delta analysis

simultaneously

- Provides Cable Stayed Bridge Wizard - Not available

- Initial configuration analysis of suspension

bridge for self-anchored or earth-anchored,

and with or without hangers

- Not available

- Geometric nonlinear analysis of suspension

bridge for each construction stage (backward)

- Same as MIDAS

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.MIDAS/Civil vs. RM2004 (5) MIDAS/Civil vs. RM2004 (5) -Dynamic/Nonlinear/Other-Dynamic/Nonlinear/Other modulesmodules

MIDAS/Civil RM2004- Eigenvalue analysis/Response

spectrum/Time history analysis

- Same as MIDAS

- Not available -Dynamic Wind Analysis

- Seismic resistance with pushover analysis

- Inelastic Time History Analysis

- Not available

- Not available

- Provides vibration isolators such as LRB

and friction pendulum system isolator- Tension-only and compression-only Spring

- Provides boundary nonlinear element for

specific vibration isolator- Same as MIDAS

-Nonlinear analysis reflecting concrete

cracking

- Same as MIDAS

- Time history analysis for moving loads - Same as MIDAS

- Reinforced Concrete/Steel section design - Same as MIDAS