Project 2 - MODELLING, ANALYSIS & DESIGN OF COMPOSITE STUCTURES IN COMFLOR & ETABS

PROJECT – 2 MODELLING, ANALYSIS & DESIGN OF COMPOSITE STRUCTURES IN COMFLOR & ETABS

AIM:

A 30 – 40 hr project on modelling, analysis & design of a state – of – the art tall composite building using ETABS software. The composite members to be designed using comflor software.

KEY HIGHLIGHTS:

MODELLING:

• The structural model prepared for the project 1 to be used for the project 2.
• Prepare two distinct structural framing plans (location of primary & secondary beams) as discussed in lecture 11.
• Create member definition for the steel sections by importing through library.
• Select deck slab profile and section using the comflor manual.
• Modelling of the composite metal deck section in ETABS.
• Modelling of the composite columns in ETABS.
• Create steel beam, steel column, bracing & core wall properties to be used further in the project.

LOADING & LOAD COMBINATIONS:

• Comflor: wet concrete and construction loads for the design of deck slab.
• ETABS: use load patterns and combinations created in project 1.
• Definition of pre-composite dead loads.
• Define football loadings for the vibration checks.

STRUCTURAL ANALYSIS:

• Comflor software to be sued for the analysis of composite deck slab.
• Obtain the shear force & bending moment diagrams for the floor beams and columns.
• Check the gravity load path in the structure if it follows the designer’s intent.
• Perform quick hand calculations to confirm the base reactions for the gravity load cases.
• Check natural frequency for the floor system and mitigate the floor vibration by keeping fundamental frequency > 3Hz.

DESIGN OF STRUCTURAL MEMBERS:

• Shear studs & composite deck design calculations.
• Interpretation of the design results for the composite beam from ETABS.
• Pre-camber criteria and requirements.

KEY DELIVERABLES:

• Comflor file with the complete modelling of the slab with appropriate loadings.
• Comflor report for the composite slab design (as PDF file).
• Submit a ETABS model with the complete model of the composite structure.
• A comprehensive project report from the ETABS software (as PDF file).

PROCEDURE:

ETABS MODELING:

COLUMN SPACING AND WALL SPACING MARKING IN THE ARCHITECTURAL DRAWING:

STORY ASSIGNMENET:

GRID ASSIGNMENT:

MATERIAL ASSIGNMENT:

FRAME SECTIONS, SLAB SECTION & WALL SECTION ASSIGNMENT:

LOAD PATTERNS:

MASS SOURCE & P-DELTA ASSIGNMENT:

LOAD CASE DEFINITIONS FOR EARTHQUAKE AND WIND:

LOAD COMBINATION FOR CONCRETE FRAME DESIGN:

MODELLING OF COLUMNS, BEAMS, SLABS & SHEAR WALLS:

WALL LOAD & FLOOR LIVE LOAD ASSIGNMENT:

RUN ANALYSIS & CHECK DESIGN OF FRAMES:

COMFLOR MODELING:

• Open comflor software and enter the given data (thickness and grade).
• Enter the lengths of given member.
• Enter the span details such as profile span, deck properties and support width.
• Enter the mesh details such as grade, yield stress.
• Go to the next tab, loading and enter the live and dead load.
• Enter the design method as fire engineering and enter the fire resistance.
• In the last step, run the analysis and note the results.