20111129 Gen Column Shortening Presentation

midas Gen

midas Gen Advanced Webinar Column Shortening for High-rise Building

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Column Shortening for High-rise Building

Introduction in Column Shortening

Project Applications

Procedure for Construction Stage Analysis

Useful features for Construction Stage Analysis

Demonstration

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Demonstration

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One Stop Solution for Building and General Structures

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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.


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Introduction


Column Shortening

End Moment of Girder by Stories (Wall Connection)

Comparison between with and without considering sequential loading


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Column Shortening Elastic stresses due to gravity loads Creep caused by gravity load Drying shrinkage Temperature variations of exposed columns

Steel Concrete

Elastic Creep

Shrinkage

19.6 - -

6.1 4.6 6.1

Total 19.6 16.8

Shortenings of an 80-story column (cm)

Introduction Column Shortening


(2) Compensation for the differential column shortening in high-rise building


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Effects of column shortening

Deforms in pipes, elevator rails, cladding Cracks in partitions


Nonstructural Effect

Structural Effect

Distorted slabs or beams due to differential movements

Gravity load redistribution


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Shortening related to construction sequence


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

:Compensation

: Design Level

: Pre-slab Installation shortening

: Post-slab Installation shortening


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Compensation for differential column 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


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Application procedure for column shortening

Application in field

Material & Section property Loads, Construction sequence

Pre-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 Shortening re-analysis


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Demonstration

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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

over

view


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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

over

view

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Demonstration

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How to use the construction stage analysis in midas Gen

Define materials, sections

Assign elements, boundaries, & loads to the groups

Define time dependent materials

Enter the construction stage analysis data

Perform an analysis

Check results for each construction stage

Check column shortening

Creep & Shrinkage Compressive strength

Specify the duration of CS Activate/Deactivate element groups / boundary groups/ load groups

Procedure for Construction Stage Analysis Column Shortening


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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


Creep/Shrinkage - Eurocode, ACI, CEB-FIP, PCA, India Comp. Strength

- Eurocode, ACI, CEB-FIP, Ohzagi , India

Time dependent material properties

Construction Stage


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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


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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

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Useful Features for Construction Stage Analysis





Demonstration

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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.


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Construction Stage Analysis for Composite Members


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.


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Auto Climbing Formwork System


Construction stage for auto climbing formwork system (ACS) can be generated in midas Gen.


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Tendon Loss


Pre-stress load can be considered in construction stage analysis.

Tendon primary / secondary forces are provided with pre-stress loss graph.

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Demonstration





Demonstration

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One Stop Solution for Building and General Structures Design Procedure Demonstration

Example model

Structural plan & section

9@4=

36m

2@

4.5=

9m

5m

50m

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One Stop Solution for Building and General Structures Design 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

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Construction Schedule

3rd day

1F Formwork Installation

1F Concrete Casting


2F Concrete Casting

1st day 8th day 10th day

3 levels of shoring Construction cycle time=7 days Time of removal of lowest level of shores from concreting of top floor=5 days

Age

Age

0 5

0

7

Demonstration

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12

5

15th day

3F Concrete Casting

7

17th day

0

1F Formwork Removal 4F Formwork Installation

22th day

4F Concrete Casting

24th day 29th day

2F Formwork Removal 5F Formwork Installation

Age

Age

14

5

12

19

14

21

7

0 5

12

19

26

Demonstration

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Date Work Formwork Removal Formwork Installation

Conc. Casting

Stage Definition

Program Date

Stage Duration

1 1F Formwork Installation 1F

3 1F Concrete Casting 1F





22 1F Formwork Removal, 4F Formwork Installation 1F 4F stage 1

1 7

24 4F Concrete Casting 4F 3


8 7



15 7



22 7



Demonstration

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Date Work Formwork Removal Formwork Installation

Conc. Casting

Stage Definition

Program Date

Stage Duration


29 7



36 7



43 7



50 7



57 7


85 10F Formwork Removal 10F stage 10 64 7

92 11F Formwork Removal, 1~3F SDL 11F

stage 11

71

7 95 4~6F SDL 74

98 7~9F SDL 77

99 12F Formwork Removal 12F stage 12

78 7

101 10~12F SDL 80

133 Live Load dummy 112 28


Demonstration

Thank You! Thank You!


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1Column Shortening for High-rise Building 3IntroductionIntroductionIntroductionIntroductionIntroductionIntroductionIntroduction 11Project ApplicationsProject Applications 14Procedure for Construction Stage Analysis 16 17 18 19Useful Features for Construction Stage AnalysisUseful Features for Construction Stage AnalysisUseful Features for Construction Stage AnalysisUseful Features for Construction Stage Analysis 24DemonstrationDemonstrationDemonstrationDemonstrationDemonstrationDemonstration 31

20111129 Gen Column Shortening Presentation

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Transcript of 20111129 Gen Column Shortening Presentation