Indicative Lateral Beam Reinforcement - B-Footing Design - Report Writing Engineering Assignment Help

Assignment Task:

Design Project– Footing Design (Isolated Footing) for a Multi-storey Concrete Structure using ETABS (30% of Final Grade). 

This project involves modelling of a regular four-storey RC perimeter frame buildings. You are to work in groups of no more than two persons to analyse defined building configurations.  

The sketch on the right shows a 4-storey concrete ‘perimeter frame’ office building employing a single moment-resisting bay in each of the perimeter walls. All other internal and external framing are designed to carry only gravity loading and all beams outside the braced bays can be considered pin-ended. Precast floor slabs at each level act as diaphragms and deliver all horizontal loading (wind and earthquake) to the braced bays in the perimeter frame.  

Assume the floor slabs themselves do not contribute to lateral stiffness. Hence you are to consider vertical load case only. 

The structure consists of a 150mm slab for all levels including roof. The office is to be designed with a floor and roof live load (Q) of 3 and 2 kPa respectively.

The lateral load resisting columns are 900x460 mm with 12-D20 and the lateral load resisting  beams are 900x400 with 4-D25 top and bottom. The gravity columns are 600x600 mm and  the gravity beams are 550x350 mm. The reinforcements in the beams and columns have a  yield stress of 300 MPa. Concrete has an unconfined compressive stress of 40 MPa.  

Using ETABS/ SAP2000 or another finite element program of your choosing, conduct a  simplified analysis of the building and produce the following. Bracketed value represent perceived effort/weighting of the analyses.  

A - Basic analyses in ETABS (40%) 

1. Analyse and produce the Shear Force, bending moment and axial force diagrams of the structure under 1.2G & 1.5Qu. Discuss the importance of centre-line and column-face values.  Note: In order to achieve full marks, students are required to produce the analysis results for all  frames; both in x and y Directions. 

B-Footing Design (40%) 

1. Students are required to design two footings; 

i) Footing supporting the Gravity Column on grid B3 

ii) Footing supporting the Lateral Load Column on grid A2 

Additional Information 

Yield strength of Longitudinal bars for both beam and column is 300Mpa. 

Yield strength of Transverse bars for both beam and column is 300Mpa. 

Use Soil reliability factor (Beta) of 1.1. 

Allowable bearing pressure of foundation is 400kPa. 

It is highly recommended that each group shall develop their own spreadsheets either in  MS Excel or Mathcad. This will be very handy in designing the most efficient footing size as there will be numerous iteration involved prior to selection of the most optimized section. 

For any missing information, please incorporate valid assumptions and feel free to conduct your own research to assist you with this project. There is a wealth of information available online. If you run into technical problems, check the ETABS reference manual and/or make an assumption to ensure you can continue with your analysis. Please clearly state any assumptions you have made.  

Assessment  

You may work in a group of up to 2 students. Each student has to develop a model.  C- Report (Procedures incorporated whilst modelling) (20%) 

Submit one report per group outlining how the ETABS models were constructed. Please keep it BRIEF, include screenshots of any notable features and justify any parameters used. Show calculations where required. The documentation should be expected for a demonstration of real-world compliance.  

Please distribute the workload fairly amongst your group, feel free to assist each other and collaborate. You may be asked to show your specific contribution to the project.  

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