midas Gen
midas Gen
Advanced Webinar
Column Shortening for High-rise Building
2
Column Shortening for
High-rise Building
Introduction in Column Shortening
Project Applications
Procedure for Construction Stage Analysis
Useful features for Construction Stage Analysis
Demonstration
03
11
14
19
24
3
Introduction in Column Shortening
Project Applications
Procedure for Construction Stage Analysis
Useful features for Construction Stage Analysis
Demonstration
03
11
14
19
24
Introduction in
Column Shortening
One Stop Solution for Building and General Structures
4
Introduction
Why construction stage analysis?
Column Shortening
Wind
Live
Earthquake
Completed structure
Live, Wind and Seismic Loads Sequential Loading: Dead Loads
Construction Sequence
Dead
(1) Dead load is sequential load.
One Stop Solution for Building and General Structures
5
Introduction
Why construction stage analysis?
Column Shortening
End Moment of Girder by Stories (Wall Connection)
• Comparison between with and without considering sequential loading
8,000 9,000
4,500 4,500
8,000
9,400
9,400
9,400
3,800
3,800
1,800
One Stop Solution for Building and General Structures
6
• Column Shortening
– Elastic stresses due to gravity loads
– Creep caused by gravity load
– Drying shrinkage
– Temperature variations of exposed columns
Steel Concrete
ElasticCreep
Shrinkage
19.6--
6.14.66.1
Total 19.6 16.8
Shortenings of an 80-story column (cm)
IntroductionColumn Shortening
Why construction stage analysis?
(2) Compensation for the differential column shortening in high-rise building
One Stop Solution for Building and General Structures
7
Effects of column shortening
• Deforms in pipes, elevator rails, cladding• Cracks in partitions
IntroductionColumn Shortening
Nonstructural EffectNonstructural Effect
Structural EffectStructural Effect
• Distorted slabs or beams due to differential movements
• Gravity load redistribution
One Stop Solution for Building and General Structures
8
Shortening related to construction sequence
IntroductionColumn Shortening
• Pre-slab installation shortenings– Shortenings of supports that take place up to the time of slab installation
• Post-slab installation shortenings– Shortenings of supports that take place after the time of slab installation
① :Compensation
② : Design Level
③: Pre-slab Installation shortening
④: Post-slab Installation shortening
One Stop Solution for Building and General Structures
9
Compensation for differential column shortening
IntroductionColumn Shortening
• Reinforced Concrete Structure– Pre-slab installation shortenings has no importance– Compensation by leveling the forms– Post-slab installation shortenings due to subsequent loads and
creep/shrinkage
• Steel Structure– Columns are fabricated to exact length.– Attachments to support the slabs– Pre-slab installation shortenings need to be known.– Compensation for the summation of Pre-installation and Post-installation
shortenings
One Stop Solution for Building and General Structures
10
Application procedure for column shortening
Application in fieldApplication in field
Material & Section property
Loads, Construction sequence
Pre analysis for column shorteningPre-analysis for column shortening
Considering load redistribution
due to differential shortening
Analysis
• Updating material properties
by experiments
• Construction sequence
considering the field condition
Column Shortening analysis
•Compressive strength
•Modulus of elasticity
•Creep & Shrinkage
Material Experiment
Using Strain gauge
Measuring shortening
• Predicting shortening
for further stages
• Providing an amount of
compensation
Column Column Shortening re-analysis
IntroductionColumn Shortening
11
Project Applications
Introduction in Column Shortening
Project Applications
Procedure for Construction Stage Analysis
Useful features for Construction Stage Analysis
Demonstration
03
11
14
19
24
One Stop Solution for Building and General Structures
12
Project Applications
Burj Khalifa (Dubai, UAE)
Column Shortening
Height 705 m
No. of floors 160
Location Dubai, United Arab Emirates
Function / Usage Office Building & Residential Building
Designer Adrian D. Smith
Architect Skidmore, Owings & Merrill
General Contractor Samsung Development
ove
rvie
w
One Stop Solution for Building and General Structures
13
Project Applications
SK S-Trenue (Seoul, Korea)
Column Shortening
Area 39,600m2
No. of floors 36
Location Seoul, Korea
Function / Usage Office Building
Structure Type Composite Structure
Foundation Type Mat Foundation
Lateral load resisting system RC Core + Steel + RC Composite Frame
ove
rvie
w
14
Procedure for
Construction Stage Analysis
Introduction in Column Shortening
Project Applications
Procedure for Construction Stage Analysis
Useful features for Construction Stage Analysis
Demonstration
03
11
14
19
24
One Stop Solution for Building and General Structures
15
How to use the construction stage analysis in midas Gen
Define materials, sectionsDefine materials, sections
Assign elements, boundaries, & loads to the groups
Assign elements, boundaries, & loads to the groups
Define time dependent materialsDefine time dependent materials
Enter the construction stage analysis dataEnter the construction stage analysis data
Perform an analysisPerform an analysis
Check results for each construction stageCheck results for each construction stage
Check column shorteningCheck column shortening
•Creep & Shrinkage•Compressive strength
Activate/Deactivate element groups / •Specify the duration of CS•Activate/Deactivate element groups / boundary groups/ load groups
Procedure for Construction Stage AnalysisColumn Shortening
One Stop Solution for Building and General Structures
16
Time Dependent Material Properties
Column Shortening
1. Creep effects of concrete members having different maturities
2. Shrinkage effects of concrete members having different maturities
3. Time dependent compressive strength gain for concrete members
Procedure for Construction Stage Analysis
• Creep/Shrinkage
- Eurocode, ACI, CEB-FIP, PCA, India…
• Comp. Strength- Eurocode, ACI, CEB-FIP, Ohzagi , India …
Time dependent material propertiesTime dependent material properties
Construction StageConstruction Stage
One Stop Solution for Building and General Structures
17
Construction Stage Analysis Data
Column Shortening Procedure for Construction Stage Analysis
0 day 10 day 20 day 30 day 40 day
Construction Stage Duration Construction Stage Duration
Activation or
Deactivation of
element, boundary,
and load
Activation or
Deactivation of load
with time span from
the stage start
Activation or
Deactivation of
element, boundary,
and load
One Stop Solution for Building and General Structures
18
Check results for each construction stage
Column Shortening Procedure for Construction Stage Analysis
Analysis results can be checked for each construction stage.
Absolute minimum or maximum results of envelope can be also checked among entire construction stages.
Results for creep and shrinkage effect are provided.
[Beam Forces for each construction stage] [Displacement due to Creep & Shrinkage]
CS1
CS3
CS6
CS10
CS12
Min/Max
19
Useful Features
for Construction Stage Analysis
Introduction in Column Shortening
Project Applications
Procedure for Construction Stage Analysis
Useful features for Construction Stage Analysis
Demonstration
03
11
14
19
24
One Stop Solution for Building and General Structures
20
Building Model Generation Wizard
Column Shortening Useful Features for Construction Stage Analysis
The wizard readily allows us to define the timing of elements created and loadings applied in the
construction stages during the erection of a building.
You may find it more convenient to first click the [Automatic Generation] button to define the basic
construction stages and modify them as necessary.
One Stop Solution for Building and General Structures
21
Construction Stage Analysis for Composite Members
Column Shortening Useful Features for Construction Stage Analysis
Define an analytical model for each construction stage by assigning activated or inactivated sections
corresponding to each construction stage of a composite section.
By using Composite Section for Construction Stage, we can consider the construction sequence with
creep and shrinkage effect.
One Stop Solution for Building and General Structures
22
Auto Climbing Formwork System
Column Shortening Useful Features for Construction Stage Analysis
Construction stage for auto climbing formwork system (ACS) can be generated in midas Gen.
One Stop Solution for Building and General Structures
23
Tendon Loss
Column Shortening Useful Features for Construction Stage Analysis
Pre-stress load can be considered in construction stage analysis.
Tendon primary / secondary forces are provided with pre-stress loss graph.
24
Demonstration
Introduction in Column Shortening
Project Applications
Procedure for Construction Stage Analysis
Useful features for Construction Stage Analysis
Demonstration
03
11
14
19
24
25
One Stop Solution for Building and General StructuresDesign Procedure Demonstration
Example model
Structural plan & section
9@
4=
36m
2@
4.5
=9m
5m
50m
26
One Stop Solution for Building and General StructuresDesign Procedure
Section name Section size
G1
G2
G3
G4
WG1
WG2
400x700
400x700
600x800
500x800
400x700
600x800
Story C1 C1A C2 C3 C4
10~12
8~9
6~7
4~5
2~3
1
600x600
800x800
800x1000
1000x1000
1000x1200
1000x1300
500x600
500x600
500x600
600x600
700x700
700x700
600x600
600x800
600x800
800x800
900x1000
1000x1000
600x700
600x800
600x800
800x800
800x800
1000x1000
600x700
600x800
600x800
800x800
900x900
900x900
Section Size and Material Properties
Girder
Column
Wall
Thk = 200
fck = 240 kg/cm2
fck = 280 kg/cm2
fck = 280 kg/cm2
Demonstration
27
One Stop Solution for Building and General StructuresDesign Procedure
Construction Schedule
3rd day
1F FormworkInstallation
1F ConcreteCasting
2F FormworkInstallation
2F ConcreteCasting
1st day 8th day 10th day
3 levels of shoringConstruction cycle time=7 daysTime of removal of lowest level of shores from concreting of top floor=5 days
Age
Age
0 5
0
7
Demonstration
28
One Stop Solution for Building and General StructuresDesign Procedure
Construction Schedule
3F FormworkInstallation
12
5
15th day
3F ConcreteCasting
7
17th day
0
1F FormworkRemoval
4F FormworkInstallation
22th day
4F ConcreteCasting
24th day 29th day
2F FormworkRemoval
5F FormworkInstallation
Age
Age
14
5
12
19
14
21
7
0 5
12
19
26
Demonstration
29
One Stop Solution for Building and General StructuresDesign Procedure
Date WorkFormworkRemoval
FormworkInstallation
Conc.Casting
StageDefinition
ProgramDate
StageDuration
1 1F Formwork Installation 1F
3 1F Concrete Casting 1F
8 2F Formwork Installation 2F
10 2F Concrete Casting 2F
15 3F Formwork Installation 3F
17 3F Concrete Casting 3F
22 1F Formwork Removal, 4F Formwork Installation 1F 4Fstage 1
17
24 4F Concrete Casting 4F 3
29 2F Formwork Removal, 5F Formwork Installation 2F 5Fstage 2
87
31 5F Concrete Casting 5F 10
36 3F Formwork Removal, 6F Formwork Installation 3F 6Fstage 3
157
38 6F Concrete Casting 6F 17
43 4F Formwork Removal, 7F Formwork Installation 4F 7Fstage 4
227
45 7F Concrete Casting 7F 24
Construction Schedule
Demonstration
30
One Stop Solution for Building and General StructuresDesign Procedure
Date WorkFormworkRemoval
FormworkInstallation
Conc.Casting
StageDefinition
ProgramDate
StageDuration
50 5F Formwork Removal, 8F Formwork Installation 5F 8Fstage 5
297
52 8F Concrete Casting 8F 31
57 6F Formwork Removal, 9F Formwork Installation 6F 9Fstage 6
367
59 9F Concrete Casting 9F 38
64 7F Formwork Removal, 10F Formwork Installation 7F 10Fstage 7
437
66 10F Concrete Casting 10F 45
71 8F Formwork Removal, 11F Formwork Installation 8F 11Fstage 8
507
73 11F Concrete Casting 11F 52
78 9F Formwork Removal, 12F Formwork Installation 9F 12Fstage 9
577
80 12F Concrete Casting 12F 59
85 10F Formwork Removal 10F stage 10 64 7
92 11F Formwork Removal, 1~3F SDL 11F
stage 11
71
795 4~6F SDL 74
98 7~9F SDL 77
99 12F Formwork Removal 12Fstage 12
787
101 10~12F SDL 80
133 Live Load dummy 112 28
Construction Schedule
Demonstration
Thank You!Thank You!Thank You!
One Stop Solution for Building and General Structures
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