midas Gen Advanced Webinar Column Shortening for High-rise Building

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1 midas Gen midas Gen Advanced Webinar for High-rise Building

2 for High-rise Building Introduction in Project Applications Procedure for Construction Stage Analysis Useful features for Construction Stage Analysis Demonstration

3 Introduction in Introduction in Project Applications Procedure for Construction Stage Analysis Useful features for Construction Stage Analysis Demonstration

4 Introduction Why construction stage analysis? (1) Dead load is sequential load. Live, Wind and Seismic Loads Sequential Loading: Dead Loads Wind Live Dead Earthquake Completed structure Construction Sequence 4

5 9,400 9,400 3,800 1,800 3,800 9,400 Introduction Why construction stage analysis? Comparison between with and without considering sequential loading 8,000 9,000 8,000 4,500 4,500 End Moment of Girder by Stories (Wall Connection) 5

6 Introduction Why construction stage analysis? (2) Compensation for the differential column shortening in high-rise building Elastic stresses due to gravity loads Creep caused by gravity load Drying shrinkage Temperature variations of exposed columns Shortenings of an 80-story column (cm) Elastic Creep Shrinkage Steel Concrete Total

7 Introduction Effects of column shortening Nonstructural Effect Deforms in pipes, elevator rails, cladding Cracks in partitions Structural Effect Distorted slabs or beams due to differential movements Gravity load redistribution 7

8 Introduction 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 1 :Compensation 2 : Design Level 3: Pre-slab Installation shortening 4: Post-slab Installation shortening 8

9 Introduction 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 9

10 Introduction Application procedure for column shortening Measuring shortening Analysis Considering load redistribution due to differential shortening Using Strain gauge analysis Updating material properties by experiments Construction sequence considering the field condition re-analysis Predicting shortening for further stages Providing an amount of compensation Application in field Pre-analysis for column shortening Material & Section property Loads, Construction sequence Material Experiment Compressive strength Modulus of elasticity Creep & Shrinkage 10

11 Project Applications Introduction in Project Applications Procedure for Construction Stage Analysis Useful features for Construction Stage Analysis Demonstration

12 overview Project Applications Burj Khalifa (Dubai, UAE) 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 12

13 overview Project Applications SK S-Trenue (Seoul, Korea) 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 13

14 Procedure for Construction Stage Analysis Introduction in Project Applications Procedure for Construction Stage Analysis Useful features for Construction Stage Analysis Demonstration

15 Procedure for Construction Stage Analysis 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 Creep & Shrinkage Compressive strength Specify the duration of CS Activate/Deactivate element groups / boundary groups/ load groups Check results for each construction stage Check column shortening 15

16 Procedure for Construction Stage Analysis Time Dependent Material Properties Time dependent material properties 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 Construction Stage Creep/Shrinkage - Eurocode, ACI, CEB-FIP, PCA, India Comp. Strength - Eurocode, ACI, CEB-FIP, Ohzagi, India 16

17 Procedure for Construction Stage Analysis Construction Stage Analysis Data 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 17

18 Procedure for Construction Stage Analysis Check results for each construction stage 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. CS1 CS10 Min/Max CS3 CS12 CS6 [Beam Forces for each construction stage] [Displacement due to Creep & Shrinkage] 18

19 Useful Features for Construction Stage Analysis Introduction in Project Applications Procedure for Construction Stage Analysis Useful features for Construction Stage Analysis Demonstration

20 Useful Features for Construction Stage Analysis Building Model Generation Wizard 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. 20

21 Useful Features for Construction Stage Analysis 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. 21

22 Useful Features for Construction Stage Analysis Auto Climbing Formwork System Construction stage for auto climbing formwork system (ACS) can be generated in midas Gen. 22

23 Useful Features for Construction Stage Analysis Tendon Loss Pre-stress load can be considered in construction stage analysis. Tendon primary / secondary forces are provided with pre-stress loss graph. 23

24 Demonstration Introduction in Project Applications Procedure for Construction Stage Analysis Useful features for Construction Stage Analysis Demonstration

25 5m 50m Design Procedure Demonstration Example model Structural plan & section 25

26 Design Procedure Demonstration Section Size and Material Properties Girder fck = 240 kg/cm 2 Section name G1 G2 G3 G4 WG1 WG2 Section size 400x x x x x x800 Column fck = 280 kg/cm 2 Story C1 C1A C2 C3 C4 10~12 8~9 6~7 4~5 2~ x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x900 Wall fck = 280 kg/cm 2 Thk =

27 Design Procedure Demonstration Construction Schedule 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 F Formwork Installation 1F Concrete Casting 2F Formwork Installation 2F Concrete Casting 1st day 3rd day 8th day 10th day 27

28 Design Procedure Demonstration Construction Schedule Age 0 5 Age F Formwork Installation 3F Concrete Casting 1F Formwork Removal 4F Formwork Installation 4F Concrete Casting 2F Formwork Removal 5F Formwork Installation 15th day 17th day 22th day 24th day 29th day 28

29 Design Procedure Demonstration Construction Schedule Date Work Formwork Removal Formwork Installation Conc. Casting Stage Definition Program Date Stage Duration 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 4F 1 stage F Concrete Casting 4F F Formwork Removal, 5F Formwork Installation 2F 5F 8 stage F Concrete Casting 5F F Formwork Removal, 6F Formwork Installation 3F 6F 15 stage F Concrete Casting 6F F Formwork Removal, 7F Formwork Installation 4F 7F 22 stage F Concrete Casting 7F

30 Design Procedure Demonstration Construction Schedule Date Work Formwork Removal Formwork Installation Conc. Casting Stage Definition Program Date Stage Duration 50 5F Formwork Removal, 8F Formwork Installation 5F 8F 29 stage F Concrete Casting 8F F Formwork Removal, 9F Formwork Installation 6F 9F 36 stage F Concrete Casting 9F F Formwork Removal, 10F Formwork Installation 7F 10F 43 stage F Concrete Casting 10F F Formwork Removal, 11F Formwork Installation 8F 11F 50 stage F Concrete Casting 11F F Formwork Removal, 12F Formwork Installation 9F 12F 57 stage F Concrete Casting 12F F Formwork Removal 10F stage F Formwork Removal, 1~3F SDL 11F ~6F SDL stage ~9F SDL F Formwork Removal 12F 78 stage ~12F SDL Live Load dummy

31 Thank You!