CalculiX comparabilities with SAP2000 and Analytical Calculations in Analyzing Reinforced Concrete...
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Transcript of CalculiX comparabilities with SAP2000 and Analytical Calculations in Analyzing Reinforced Concrete...
CalculiX comparabilities with SAP2000 and Analytical Calculations in Analyzing
Reinforced Concrete 3D Frame Structure
Project MembersSameer Alam (10-PWCIV-3457)
M. Bilal Qazi (10-PWCIV-3444)
Shad Muhammad (10-PWCIV-3449)
SupervisorAsst. Prof. Faisal-ur-Rehman
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Content● Introduction
● Problem Statement
● Objectives
● Literature Review
● Methodology
● Expected Outcome
● Work Overview
● Project Time-line
● References
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Introduction
● Finite Element Analysis (FEA) is a numerical technique for
understanding behavior of structures.
● Commercial software are black boxes and proprietary i.e one cannot
see/modify the source code. It is difficult to acquire the output tailored
for research.
● Reliability of analysis softwares is required to be studied.
● To explore CalculiX - A free Finite Element Software, for the analysis
of Reinforced Concrete(RC) Frame Structures.
● To use a genuine and ethically legal software for analysis.
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Problem Statement● SAP2000, SAFE and ETABS are commercial and proprietary
softwares are less suitable for engineering research.
● A FEA software for CED is required that can be modified and
developed as per our own requirement.
● Remember, all softwares provide disclaimer and provide no
guarantee on accuracy and reliability of results.
● Hence we require, 'a comparative analysis of CalculiX, analytical
and commercial FEA software by using example of RC frame
structure to explore the capability of CalculiX'.
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Objectives
● Getting complete grasp over application of FEA to frame structures.
● Bringing forward & learning a new software “CalculiX”: which may
be more reliable and productive in structural analysis results.
● To create tables and graphs of comparative results.
● To test the effectiveness of using CalculiX.
● To lay out background for adopting CalculiX as a home grown
software for the Department of Civil Engineering, UETP.
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Mission Statement
To Develop a Free Structural Engineering software for the Department of Civil Engineering, UETP, which can be designed, modified and used
as per our own requirement.
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Scope
● Our major work will be carried out in CalculiX, while SAP2000
and manual calculation will be used for cross-check.
● To master SAP2000 and incorporating MATLAB as a tool for
data processing, to help us increase the results efficiency and
productivity.
● A case study will be conducted on a Warehouse of KPK FATA
Secretariat.
● We will only perform computational & manual analysis.
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Limitations
● Only frame structure will be worked out.
● No experimental testing will be conducting.
● Only one case study will be carried out.
● No design calculations and design reports.
● Only gravity and earthquake loads will be taken.
● Linear analysis
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Why Structure Analysis Softwares?
● More Efficient
● Entity Behavior Modeling
● Greater Flexibility
● Fewer Flaws
● Time saving
– For professional engineers, contractors and architects, structural analysis software is a time saver
● Peace of Mind
– A building project is stressful enough without worrying about integrated building codes, proper construction techniques, and architectural calculations
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CalculiX● A Free Software, Three-Dimensional Structural Finite Element
Program, designed to solve field problems.
● It can be used, shared, decoded and rebuilt “FREELY”.
● It’s a Multi-Physics software covering many scientific disciplines and
providing many analysis options.
e.g.
– Seepage under Dams
– Maximum stress in a para-glide
– Pipe Flow analysis, Channel Flow Modeling, Time History Analysis, etc.
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Literature Review
● Literature about Basics of CalculiX
● Analysis of Frames in SAP2000
● Analytical Analysis of Frame Structures
(Stiffness Method, Moment Coefficient Method, etc)
● Reference manuals and documentations of CalculiX
and SAP2000
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Methodology
● We will start our work with basic structural models and leading
towards 3D frame structures.
● We will use analytical methods to manually analyze the 3D 2-Storey,
3 Bay frame model
(Stiffness Method, Moment Coefficient Method, etc)
● Analyze frames in SAP2000
● Analyze same frame in CalculiX
● Finally, comparing the results of both softwares and manual
calculations by using a case study.
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Expected Outcome
● We will get the comparative results in graphical & tabular
form for frame structure analysis in CalculiX & SAP2000.
● Percentage difference based on the result will be taken.
● Conclusions and recommendations will be provided.
● A comprehensive documentation for analysis procedure
of 3D frame structure using CalculiX will be prepared.
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Work ProgressBasic Model of Beam in CalculiX
Fig. 1 Steps involved in Modeling and Analysis of a Cantilever Beam in CalculiX
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Work ProgressBasic Model of Cantilever Beam in CalculiX
1kips
10'
Location Loads (kips)
10' Distance 1
Fig. 2 Cantilever Beam in CaluliX
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Basic Model of Continuous 3-Bay Beam in CalculiX
Location Loads (kips)
Bay 1, Midspan 1
Bay 2, Midspan 1
Bay 3, Midspan 1
Fig. 3 Continuous 3-Bay Beam in CalculiX
1kips 1kips 1kips
30'
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Basic Model of Truss in CalculiX1kips
5'
5'
Location Loads (kips)
At Joint #2 1
Fig. 4 Truss example in CalculiX
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Basic Model of Cantilever Beam in SAP2000
Fig. 5 Shear Force & Bending Moment Diagrams of Cantilever Beam in SAP2000
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Basic Model of Continuous 3-Bay Beam in SAP2000
Fig. 6 Shear Force & Bending Moment Diagrams of Continous 3-Bay Beam in SAP2000
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Basic Model of Truss in SAP2000
Fig. 7 Axial Force Diagram of 2D Truss in SAP2000
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Basic Model of 2D-RC Frame Structure in SAP2000
Fig. 8 Shear Force & Bending Moment Diagrams of 2D RC Frame Structure in SAP2000
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Manual Calculations Result2D-RC Frame Structure using Stiffness Method
Fig. 9 2D-RC Frame Structure using Stiffness Method
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Manual Calculations Result2D-RC Frame Structure using Moment Coefficient Method
Fig. 10 2D-RC Frame Structure using Moment Coefficient Method
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Finalized 3D-RC Frame Structure will Look Like following...
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Project Overview
● We performed the analysis of basic structures and structural
elements i.e Beams, truss and frames in SAP2000 & manually.
● Having a difference in results up to 7 to 8%.
● Solved 3 examples (2 Beams, 1 Truss element) in CalculiX &
SAP2000.
● We have made a GUI based on parametric solution for
automatic calculation for CalculiX having a simple GUI
(Graphical User Interface).
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Next Tasks● MATLAB interface
● Slab analysis
● 3D Frame analysis
● Lateral earthquake loading
● Interface for parametric inputs
● Custom output formats
● Importing/exporting models to SAP2000
● Creating analysis report
● Documentation of all the processes
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Project Time-line: Gantt Chart
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Weekly Meeting ScheduleDate Day Task Name Student Status
13/09/13 Friday Literature review on CalculiXM. Bilal Qazi
Sameer Alam Shad Muhammad
Completed
20/09/13 Friday 2D RC-Frame Structure analysis in SAP2000 Sameer Alam Completed
26/09/13 Thursday Manual Calculations & analysis of 2D RC-Frame structure M. BilalShad Muhammad
Completed
05/10/13 Saturday 1st Presentation Preparation Shad Muhammad Completed
04/10/13 Friday Presentation Review & Delivery PracticeM. Bilal
Sameer Alam Shad Muhammad
Completed
31/10/13 ThursdaySimple Beam analysis in CalculiX
M. Bilal QaziSameer Alam
Shad Muhammad
Completed
05/11/13 TuesdayTruss, cantilever beam & 3 Bay beam example in Calculix
M. Bilal QaziSameer Alam
Shad Muhammad
Completed
27/11/13 Wednesday Recheck of manual calculation using MATLAB M. Bilal Qazi Shad Muhammad
Completed
15/01/14 Wednesday Working on Project Copy Sameer AlamShad Muhammad
In progress
21/02/14 Friday Automating Calculations in Octave Shad Muhammad In Progress
04/03/14 Tuesday 2nd Presentation Preparation M. Bilal Qazi Sameer Alam
Completed
05/03/14 Wednesday Presentation review Shad Muhammad Completed
10/03/14 Monday Making and interface based on Parametric Procedures Shad Muhammad In progress
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References
● CalculiX USER'S MANUAL
(www.bconverged.com/calculix/doc/cgx/html/index.html)
● Getting Started with CalculiX (www.bconverged.com/content/calculix/doc/GettingStarted.pdf)
● SAP2000 Tutorial Manual - Extra Materials
● Tutorial to SAP2000 Student Edition
● Stiffness Method details
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THANK YOU
Special Thanks to
Sir Faisal-ur-Rehman for his hard work &
cooperation