20120703 Gen Advanced Webinar Construction Stage Analysis
Transcript of 20120703 Gen Advanced Webinar Construction Stage Analysis
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Construction Stage Analysis withSpecial Emphasis on Column Shortening
midas Gen Advanced Webinar on
Webinar ObjectiveConstruction Stage Analysis
Column ShorteningProcedure for Construction Stage AnalysisUseful Features for Construction Stage AnalysisProject ApplicationsLive DemonstrationWhy midas Gen
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Webinar Objective
Webinar ObjectiveConstruction Stage Analysis
Column ShorteningProcedure for Construction Stage AnalysisUseful Features for Construction Stage AnalysisProject ApplicationsLive DemonstrationWhy midas Gen
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Introduction
Objective
1. Introduction to Construction Stage(CS) Analysis.
2. Introduction to Column Shortening.
3. Discussion of Features available in midas Gen for CS Analysis.
4. Live demonstration of performing CS analysis on a 40 Storey RC Building
and interpretation of Column Shortening results.
5. At the conclusion of the webinar, familiar with construction stage
analysis, column shortening phenomenon and midas Gen applicability to
those issues.
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Construction Stage Analysis
Webinar ObjectiveConstruction Stage Analysis
Column ShorteningProcedure for Construction Stage AnalysisUseful Features for Construction Stage AnalysisProject ApplicationsLive DemonstrationWhy midas Gen
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Construction Stage Analysis
Why Construction Stage (CS) Analysis
1. General analysis is performed under the assumption that all loads are simultaneouslyapplied to a completed structure.
2. This assumption is not valid in a real construction sequence because building is
constructed floor by floor and dead load acts sequentially .
Construction Sequence
Self weight ofslab
Other Dead Loads (Part ions,Finishes)
Completed Structure
Dead Load + LiveLoad
Wind
Earthquake
LL,WL,EQActs
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Construction Stage Analysis
Conventional analysis Vs CS Analysis
Case 1 – ConventionalAnalysis
Case 2 – CSAnalysis
Stage 1 Stage 2
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Construction Stage Analysis
Conventional analysis Vs CS Analysis
Case 1 – ConventionalAnalysis
Case 2 – CSAnalysis
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Construction Stage Analysis
Where CS Analysis is Required?
Long Span Trusses
Long Span Slabs, Beams constructed in multiple stages
Prestressed concrete Structures
CS analysis should be performed for all structures where there is a change inSupport Conditions, Loading and varying material properties (Concrete).
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Column Shortening
Webinar ObjectiveConstruction Stage Analysis
Column ShorteningProcedure for Construction Stage AnalysisUseful Features for Construction Stage AnalysisProject ApplicationsLive DemonstrationWhy midas Gen
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Column Shortening
Column Shortening
Elastic Shortening
Young’s Modulus is strictly applicable onlyto the Linear Categories.
E = (σ / ε) ΔL = (PL/A E)
σ
Decrease in the length under imposed loadwhich is linearly proportional to load.
Inelastic Shortening (Concrete Structures)
σ
Creep Shortening.Shrinkage Shortening.
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Column Shortening
Column Shortening
With increased height of structures the effect of column shortening (Elastic & Inelastic)
take on added significance and need special consideration in design and construction.
Elastic Shortening of 80 Storey Steel Structure ~ 180 mm to 255 mm.
Elastic Shortening of 80 Storey Concrete Structure ~ 65 mm.
Total Shortening of 80 Storey Concrete Structure ~ 180 to 230 mm.
Inelastic Shortening ~ 1 to 3 times Elastic shortening.
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Column Shortening
Effects of Column Shortening
Absolute shortening is rarely of practical interest.
Differential shortening between adjacent vertical elements is the most important
factor for engineer.
Axial Shortening of vertical elements
will not effect those elements very much,
horizontal elements like beams and slabs
and non structural elements are affected.
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Column Shortening
Effects of Column Shortening
Cracks in Partition Walls. Cracks in Staircases Deformation of Cladding. Mechanical Equipment. Architectural Finishes. Built in Furnishings.
These non structural elements are notintended to carry vertical loads and aretherefore not subjected to shortening.
Slabs may not be truly horizontal after some time. Beams could be subjected to higher bending moments. Load transfer.
Structural Effects
Non Structural Effects
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Column Shortening
Effects of Column Shortening
Deformation and breakage of Facades, windows &Parapet walls…
Reverse Inclination of Drainage Piping System
Deformation of Vertical Piping System Deformation and breakage of internal partitions
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Column Shortening
Movements related to construction sequence
• Pre-slab installation shortenings – Shortenings taking place up to the time of slab installation
• Post-slab installation shortenings – Shortenings taking place after the time of slab installation
: Compensation
: Design Level
: Pre-slab Installation shortening: Post-slab Installation shortening
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Column Shortening
Procedure for Accounting Column Shortening Analytical Measurement
Reflection of physical properties in calculation frommaterial experiment:
Young’s Modulus, Poisson’s Ratio, MeanCompressive strength, Volume to Surface ratio,Shapes, sizes etc.
Reflection of effects of Climate on shortening: Average Temperature , RH etc.
Construction Sequence:Stage duration, Additional Steps, Member Age,Load activation age, Boundary activation age etc.
Reflection of the above effects on site master-schedule.
Installation of sensors or gages in members fordetermining the actual shortening.
Understanding and noting the following:Curing procedure / Temperature,
Actual Shortening,Change in Ambient Temperature (Important),
Actual Humidity,
Deviation from Defined Construction Stages,
Manipulation of factors in analytical Calculation,Re- Analysis…
Experimental Measurement
Using Software or Manually(Manual calculation is almost impossible)
Field Measurements
Method has Limitation
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Column Shortening
Compensation at Site
ColumnColumn
1 st correction
2nd correction
1st correction
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Procedure For CS Analysis
Performing CS Analysis in midas Gen
Define materials, sections
Assign Elements, Boundaries,Loads to the groups
Define Time Dependent Materials
Enter the Construction Stage AnalysisData
Perform Analysis
Check results for each ConstructionStage
Check Column Shortening
•Creep & Shrinkage•Compressive strength
•Specify the duration of CS•Activate/Deactivate elementgroups / boundary groups/ loadgroups
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Procedure For CS Analysis
Time Dependant Material Properties
Creep and Shrinkage Compressive Strength
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Procedure For CS Analysis
Construction Stage Analysis Data
0 day 10 day 20 day 30 day 40 day
Construction Stage Durat ion Construction Stage Duration
Activation orDeactivation of
element, boundary,and load
Activation orDeactivation of loadwith time span from
the stage start
Activation orDeactivation of
element, boundary,and load
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Procedure For CS Analysis
Column Shortening Graph
• Post-slab installation shortening (Subsequent
Slab)
• Pre-slab installation shortening (Up to slab )
• Total Shortening (Pre –Slab + Post –Slab)
[Column Shortening Graph ]
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Useful Features for Construction Stage Analysis
Webinar ObjectiveConstruction Stage Analysis
Column ShorteningProcedure for Construction Stage AnalysisUseful Features for Construction Stage AnalysisProject ApplicationsLive DemonstrationWhy midas Gen
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Useful Features for CS Analysis
Building Model Generation Wizard
The wizard readily allows us to define the timing of elements created and loadings applied in theconstruction 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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Useful Features for CS Analysis
Construction Stage Analysis for Composite Members
Define an analytical model for each construction stage by assigning activated or inactivated sectionscorresponding 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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Useful Features for CS Analysis
Spring Supports for Soil InteractionPoint Spring Support (Linear, Comp.-only, Tens.-only, and Multi-linear
type)
Surface Spring Support (Nodal Spring, and Distributed Spring)
Springs can be activated / deactivated during construction stage
analysis.
[ Nonlinear point spring support]
[ Nodal Spring and Distributed Spring] [ Surface Spring Support] [ Pile Spring Support]
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Useful Features for CS Analysis
Tendon Loss
Ple-stress load can be considered in construction stage analysis.
Tendon primary / secondary forces are provided with pre-stress loss graph.
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Project Applications
Webinar ObjectiveConstruction Stage Analysis
Column ShorteningProcedure for Construction Stage AnalysisUseful Features for Construction Stage AnalysisProject ApplicationsLive DemonstrationWhy midas Gen
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Project Applications
Burj Khalifa (Dubai, UAE)
Height 705 mNo. of floors 160Location Dubai, United Arab EmiratesFunction / Usage Office Building & Residential BuildingDesigner Adrian D. SmithArchitect Skidmore, Owings & MerrillGeneral Contractor Samsung Development
o v e r v
i e w
CS:1
CS:30
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Project Applications
SK S-Trenue (Seoul, Korea)
Area 39,600 m 2
No. of floors 36Location Seoul, KoreaFunction / Usage Office BuildingStructure Type Composite StructureFoundation Type Mat FoundationLateral load resisting system RC Core + Steel + RC Composite Frame
o v e r v
i e w
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Project Applications
Keangnam Hanoi Landmark Tower (Hanoi, Vietnam)
Height 345mNo. of floors 70 fl., 49 fl.Location Hanoi, VietnamFunction / Usage Hotel, Office, and Residential buildingStructure Type Reinforced Concrete StructureArchitect Heerim, Samoo, Aum & Lee, Hellmuth Obata + KassabaumContractor Keangnam
o v e r v
i e w
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Live Demonstration
Webinar ObjectiveConstruction Stage Analysis
Column ShorteningProcedure for Construction Stage AnalysisUseful Features for Construction Stage AnalysisProject ApplicationsLive DemonstrationWhy midas Gen
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Live Demonstration
Structural Plan
Typical Floor Plan
Storey's :- 40
Storey Height :- 3.15 m
Total Height :- 126.85 m
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Live Demonstration
Material and Sectional Properties
Level fck
Size WallThk. C1 C2
1 st to 10 th 50 1200 x 1200 900 x 900 500
11th
to 20th
40 1000 x 1000 800 x 800 500 21 st to 30 th 35 800 x 800 700 x 700 500
31 st to 40 th 30 600 x 600 600 x 600 500
Girder 30 900 x 600 -
Link Beam 30 700 x 500 -
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Live Demonstration
Construction Schedule
Stage1
Stage4
Final Stage
Partition Load : 5 weeks after first slab casting.Finish Load : 5 Weeks after Partition WallConstruction.
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Live Demonstration
Steps
Time Dependant Material Properties•Define Creep and Shrinkage Properties .•Define time Dependant Material Properties.•Define Time Dependant Material Link.•Change Element Dependant Material Property
Define Construction Stage•Define Construction stages using Building Wizard for CS analysis
•Create LL group and add LL to LL group.•Define CS for LL
Perform Analysis
Results•BMD’s and SFD’s for different CS. •Deformations for different CS.•Column Shortening Graph.
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Why midas Gen
Webinar ObjectiveConstruction Stage Analysis
Column ShorteningProcedure for Construction Stage AnalysisUseful Features for Construction Stage AnalysisProject ApplicationsLive DemonstrationWhy midas Gen
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Q A
One Stop Solution for Building and GeneralStructures
http://en.midasuser.com/