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MID
AS
pro
vid
es
the b
est
solu
tion
M
IDA
S p
rovid
es
the b
est
solu
tion
in S
tru
ctu
ral E
ng
ineeri
ng
.in
Str
uct
ura
l E
ng
ineeri
ng
.
Comparison of MIDAS/Civil V.670
and RM2004
MIDAS Information Technology
MID
AS
pro
vid
es
the b
est
solu
tion
M
IDA
S p
rovid
es
the b
est
solu
tion
in S
tru
ctu
ral E
ng
ineeri
ng
.in
Str
uct
ura
l E
ng
ineeri
ng
.ContentsContents
• MIDAS/Civil Analysis Features
• MIDAS/Civil vs. RM2004
MID
AS
pro
vid
es
the b
est
solu
tion
M
IDA
S p
rovid
es
the b
est
solu
tion
in S
tru
ctu
ral E
ng
ineeri
ng
.in
Str
uct
ura
l E
ng
ineeri
ng
.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
MID
AS
pro
vid
es
the b
est
solu
tion
M
IDA
S p
rovid
es
the b
est
solu
tion
in S
tru
ctu
ral E
ng
ineeri
ng
.in
Str
uct
ura
l E
ng
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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
MID
AS
pro
vid
es
the b
est
solu
tion
M
IDA
S p
rovid
es
the b
est
solu
tion
in S
tru
ctu
ral E
ng
ineeri
ng
.in
Str
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ura
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ng
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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)
MID
AS
pro
vid
es
the b
est
solu
tion
M
IDA
S p
rovid
es
the b
est
solu
tion
in S
tru
ctu
ral E
ng
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.in
Str
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ng
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Definition of Unknown Load Factors
MID
AS
pro
vid
es
the b
est
solu
tion
M
IDA
S p
rovid
es
the b
est
solu
tion
in S
tru
ctu
ral E
ng
ineeri
ng
.in
Str
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ura
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ng
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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
MID
AS
pro
vid
es
the b
est
solu
tion
M
IDA
S p
rovid
es
the b
est
solu
tion
in S
tru
ctu
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ng
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ng
.in
Str
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ura
l E
ng
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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)
MID
AS
pro
vid
es
the b
est
solu
tion
M
IDA
S p
rovid
es
the b
est
solu
tion
in S
tru
ctu
ral E
ng
ineeri
ng
.in
Str
uct
ura
l E
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ng
.
• 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)
MID
AS
pro
vid
es
the b
est
solu
tion
M
IDA
S p
rovid
es
the b
est
solu
tion
in S
tru
ctu
ral E
ng
ineeri
ng
.in
Str
uct
ura
l E
ng
ineeri
ng
.
• 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
MID
AS
pro
vid
es
the b
est
solu
tion
M
IDA
S p
rovid
es
the b
est
solu
tion
in S
tru
ctu
ral E
ng
ineeri
ng
.in
Str
uct
ura
l E
ng
ineeri
ng
.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
MID
AS
pro
vid
es
the b
est
solu
tion
M
IDA
S p
rovid
es
the b
est
solu
tion
in S
tru
ctu
ral E
ng
ineeri
ng
.in
Str
uct
ura
l E
ng
ineeri
ng
.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
MID
AS
pro
vid
es
the b
est
solu
tion
M
IDA
S p
rovid
es
the b
est
solu
tion
in S
tru
ctu
ral E
ng
ineeri
ng
.in
Str
uct
ura
l E
ng
ineeri
ng
.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
MID
AS
pro
vid
es
the b
est
solu
tion
M
IDA
S p
rovid
es
the b
est
solu
tion
in S
tru
ctu
ral E
ng
ineeri
ng
.in
Str
uct
ura
l E
ng
ineeri
ng
.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
MID
AS
pro
vid
es
the b
est
solu
tion
M
IDA
S p
rovid
es
the b
est
solu
tion
in S
tru
ctu
ral E
ng
ineeri
ng
.in
Str
uct
ura
l E
ng
ineeri
ng
.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