Reinforced concrete design help

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SUMMARY

The forum discussion focuses on reinforced concrete design, specifically addressing homework related to the moment distribution method for portal frames. The participant, Ben, outlines his approach using limit state theory to calculate design loads, shear forces, and moments for beams. He details his methodology for confirming beam deflection and calculating column and footing sizes based on structural loads. The discussion highlights the importance of accurate calculations in reinforced concrete design, particularly for upcoming exams.

PREREQUISITES
  • Understanding of limit state theory in structural design
  • Familiarity with moment distribution method for analyzing frames
  • Knowledge of shear force and bending moment calculations
  • Experience with reinforced concrete design principles and calculations
NEXT STEPS
  • Study the moment distribution method in detail for frame analysis
  • Learn about limit state design principles in reinforced concrete
  • Research shear and moment calculations for beams and columns
  • Explore footing design considerations, including punching shear and ground bearing pressure
USEFUL FOR

This discussion is beneficial for civil engineering students, structural engineers, and anyone preparing for exams in reinforced concrete design and analysis.

benl87
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Homework Statement



Hi there,

I have an exam coming up regarding reinforced concrete, the question is to be similar to the one in the attached brief. It shows all the variables and given data. I apologise as I have already posted this question elsewhere but I don't think I laid it out properly or showed enough working of my own. My teached has been little help to me and I am hoping someone can comment on my work and tell me if I'm on the right track. Big thanks to Studiot who has helped me significantly so far.

Homework Equations



The loads are to be considered using limit state theory (i.e. Design Loads = 1.2G (dead load) + 1.5Q (live load))

I have assumed the structure (refer brief for layout) will be several portal frames without the need for a slab. I have been told to solve the frame using the moment distribution method which I have attempted to a point in the attachment.


The Attempt at a Solution



I have attached my attempt at a solution to the post and hope it makes some sense.
My plan of attack following where I am now up to is as follows:

-Solve shear force for the beam
-Solve negative moments (wl²/10), positive moments (wl²/11 in end spans, wl²/16 in interior spans) and transverse design shears (at face of interior support, at mid-span and end supports)
-Confirm beam resists encastre beam deflection (wl³/192EI for point loads and wl^4/384EI for udls)
-Calculate column size using moment about beam/column connection and vertical axial load transmitted from beam
-Calculate footing sizes considering ground bearing pressure, bending at the base, shear at the base and punching shear.

Thanks in advance,

Ben
 

Attachments

Physics news on Phys.org
I have the exact same concrete assignment for my structs theory 2 class except the span is 16m. everything else is work for word!

would love your full calcs...

cheers

James
 

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