03-building project applications using midas gen
Post on 04-Dec-2014
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MIDAS GEN‐Project Applications
“ Most Intelligent Design & Analysis System…
MIDAS GEN…… ”
What is Midas/Gen?
MIDAS/Gen is a Windows‐based, general‐purpose structural analysis and optimal design system
MIDAS: the Most Intelligent Design & Analysis System
Gen : General Structural Design System
Midas/Gen has been used for over 10 years and applied over 4,000 projects successfully.
It has higher credibility and stability.
Main Features of Midas/Gen
- Intelligent User Interface.- Latest Enhanced Computer Graphics.- User oriented input/output. - High-rise Specific Functionality.- High-end Analysis Capabilities.- Fast Solver Speed.- Comprehensive Design module.
Why MIDAS ?
It contains High‐end Analysis Features and comprehensive design capabilities.
Are there a need for such comprehensive analysis features?
Yes.
Innovation in Building Construction
Current construction market allows for iconic building with very un‐usual shapes
Challenges for Structural Engineer
Building codes give only guidelines and can’t cover all special cases.
Overestimation lead sometimes to un‐safe design.
Challenges for Structural Engineer
There is a need for a powerful analytical software that comprehensively address the behaviour of such buildings and lead to safe design.
Shall I stop using my usual software?
No. At least you have to use parallel model for verification of the results.
Manual verifications may not be suitable in complex projects.
Midas/Gen Main Features
Intelligent User Interface
Latest Enhanced Computer Graphics
Special Visualization Features
Modeling Capabilities
Direct Transfer with:
-Tekla Structures
-Revit Structure
-STAAD
Import/Export (Autocad DXF, MGT,….ect).
Merge Data Files
Unlimited Undo/Redo & step return using History.
High‐end Analysis Features
P‐Delta & Large ‐Displacement analysis‐Dynamic Analysis‐Base Isolators & Dampers‐Pushover Nonlinear ‐Analysis‐Inelastic Time History Analysis‐Staged post‐tensioning‐Centenary Cable Structure‐Heat of Hydration Analysis‐ Floor Vibration Analysis
High‐Rise Specific Functionality
‐Column Shortening reflecting change in elastic modulus, creep and shrinkage‐Construction Stage Analysis accounting for change in geometry, support and loading.‐Building model generation wizard.‐Material stiffness changes for cracked sections.
Construction Stage /Column Shortening Analysis
Accounting for time‐dependent properties of concrete
Design Capabilities
Composite members design. Structural steel weight optimization Graphics representing steel ratios,
weight distribution n and average safety ratios.
Reinforcing steel size and spacing based on auto‐calculated reinforcing steel.
Slender R/C column design. Shear wall design reflecting the
slenderness ratio. Auto calculation of effective buckling
length factor. Auto generation of design check
calculations and design summaries.
Dubai Pearl Project‐Case Study
Building Description
Dubai Pearl project is a multi‐billion US $ mixed use development project located at the heart of new Dubai.
It has significant design and build‐ability challenges in the field of structural engineering.
Dubai Pearl‐Brief
The plan of the project has a circular shape with an approx. diameter of 500m.
≈ 25 Football Stadium
Dubai Pearl will comprise four iconic towers consists of: Premium offices, International retail, residential and, Five star‐hotels.
Building Description
Total built‐up area: 20 mil sq ftParking: 15,500 parking spaces Population: 9,000 residents / 12,000 employees
“ a city within a city… ”
Building Description
The four iconic towers are connected at top by crown (Sky Palace).
SKY PALACE
Four Iconic Towers
SKY PALACE is a unique architectural feature for Dubai Pearl project
Top Crown
Lateral Stability for Individual Towers
Central Core (Bearing Wall Syatem‐UBC97): Cast‐in‐situ concrete with wall thicknesses from 900mm to 500 mm with concrete grade of C60/75.
Perimeter Columns: Composite columns with high strength concrete grade of C80/90.
Foundation: A 3.25 m Raft on 1.5 m bored piles.
Central Core
Perimeter Columns
MIDAS Gen Modeling
MIDAS Gen Modeling
-Nodes : 90k-Beam Elements : 66k-Plate Elements: 39k-Wall Elements: 37k-Stories: G+73+4 Mez.+ Roof-Height: ~300m
MIDAS Model
MIDAS Gen Modeling
-Importing DXF files
DXF files
MIDAS Gen Modeling
-Element Section Definition
Section Definition
MIDAS Gen Modeling
Composite Section
MIDAS Gen Modeling
Plate/Wall Elements
MIDAS Gen Modeling
Material Definition
MIDAS Gen Modeling
Section Stiffness Modifiers
MIDAS Gen Modeling
Boundary Conditions
MIDAS Gen Modeling
Load Cases
MIDAS Gen Modeling
Wind Case of Loading
MIDAS Gen Modeling
Seismic Case of Loading
MIDAS Gen Modeling
Seismic Case of Loading
Analysis Results
MIDAS Gen Modeling
Story Drift
Story Drift
Midas Gen Modeling
ETABS MIDAS GEN
DUBAI PEARL
DUBAI PEARL‐Period Comparison
Mode #Period (Sec)
ETABS MIDAS GEN
1 8.76 8.78
2 7.81 7.78
3 6.62 6.71
4 3.48 3.34
5 3.41 3.31
DUBAI PEARL‐Base Shear Comparison
Load CaseBase Shear (kN)
ETABS MIDAS GEN
Wx(BS) -1.13E+05 -1.11E+05
Wy(BS) -1.24E+05 -1.22E+05
EQx -2.78E+05 -2.79E+05
EQy -2.78E+05 -2.79E+05
SPECxy ‐ x 2.81E+05 2.79E+05
SPECxy ‐ y 2.82E+05 2.80E+05
Erection Sequence with time‐dependent Model
A comprehensive analysis that considers :
Erection sequence
Time-dependent properties of concrete.
Have been developed in order to asses a
realistic deformation properties of the
building and Differential Shortening between
central core and perimeter columns
MIDAS GEN Model
Erection Sequence assuming reasonable construction program has been carried out
Step No. 15 Step No. 40
Step No. 60 Final Step
Shrinkage of Concrete
Time Dependent Properties of Concrete
Creep of Concrete
Time Dependent Properties of Concrete
Aging of Concrete
Construction Sequence Assumptions
The floor cycle is 7 days. The finishing and cladding will start after reaching L20.
The finishing cycle is 7 days.
Columns/Walls Vertical Shortening (VS)
Column
Wall
VS (Wall) = 92 mm
VS (Column) = 130 mm
Differential Shortening and Column Lengthening Regime.
Story Range Column Lengthening(mm)
L50‐Roof 35
L40‐L49 35
L30‐L39 30
L20‐L29 25
L10‐L19 5
Base‐L09M 0
Differential Shortening
Column Lengthening
‐ The differential shortening between the outer columns and central core has been calculated for each story.
‐ Column lengthening regime has been proposed to overcome floor tilting.
‐Monitoring process will be conducted during construction.
Long‐term effects on the Outrigger Design
There is an additional forces in the outriggers and belt trusses due to long term effects.
It is resulted from differential shortening between outer columns and central core.
Outrigger Steel Diagonal Members
Mechanical Floor Level L37
Rolex Tower‐Case Study
Rolex Tower Client: Mr. Abdul Hamied Seddiqi Lead Consultant: Skidmore, Owings & Merril (SOM)
Local Architect: Erga Progress Structural Design: e.construct Contractor: Dubai Contracting Company
•Basement+Ground+Mezzanine+60 floors tower – approx. floor area 940m2 each
ADFC Building‐Case Study
ADFC Building
Differential settlement is reasonably calculated by using MIDAS Software
Signature Towers‐Case Study
Construction Stages
CS#3
CS#5
CS#17
CS#14
CS#11
CS#8
Long‐term effects
Creep of Concrete
Shrinkage of Concrete
Bright Star‐Case Study
Bright Star Tower
•60 storey residential building
• Each storey is approx. 1370m2
• Precast beams, precast pre‐stressed hollow core slabs and stairs
• Cast‐in‐situ columns and walls
Bright Star Tower‐Modeling
Bright Star Tower‐Modeling
Mode shape 1Mode shape 2
Mode shape 3
Bright Star Tower‐Seismic Forces
Bright Star Tower‐Wind Forces
Conclusions
‐MIDAS/Gen is a powerful analytical tool.
-It has fast solver; contains advanced analysis capabilities and comprehensive design modules.
- There is a real need nowadays to use software with advanced analytical capabilities to trace the behavior of iconic buildings, which lead to safe and reliable design.
- Midas/Gen has been used successfully over 10 years in a wide range of structures.
www.econstruct.aewww.midasuser.com
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