Designing Haunch for Cantilever Beam in BS 8110

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Discussion Overview

The discussion centers on the design of a haunch for a cantilever beam, specifically within the context of BS 8110. Participants explore the structural implications of the haunch in relation to the beam's support and reinforcement, with considerations for both practical engineering applications and academic exercises.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant inquires about the design of the haunch, noting the dimensions of the slab and expressing difficulty in finding relevant design guidance.
  • Another participant suggests that the profile of the haunch should depend on its intended purpose, questioning whether the goal is to minimize beam weight by redistributing material to counteract higher moments at the supports.
  • A later reply requests clarification through a sketch, providing additional context about the slab and the cantilever beam's support structure.
  • Some participants express uncertainty about whether the inquiry pertains to a real engineering project or a homework exercise, with one confirming it is part of a university capstone design project.
  • Another participant critiques the characterization of the structure as a haunch, suggesting it resembles a significant portion of the overall structure and indicates a lack of sufficient information to provide a solid answer.

Areas of Agreement / Disagreement

Participants express differing views on the nature of the structure in question and the adequacy of the provided information for a proper design response. There is no consensus on the best approach to the haunch design or the structural support needed.

Contextual Notes

Participants note limitations in the information provided, indicating that further details are necessary for a comprehensive analysis. The discussion reflects varying interpretations of the structural requirements and the role of the haunch.

HarryKoh
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Hi guys, how do I design the haunch for the cantilever beam? The slab area is relatively small, with 125thk ( 4.39m x 1190m ). I've looked through everywhere but I can't find on how to design the haunch. I'm using BS 8110. Thanks.
 
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I'm not sure exactly what you mean. Maybe a sketch would be helpful.

The profile of the haunch will depend on why you are using a haunched beam. Do you want to minimise the beam weight by moving material from near the middle to the supported ends so as to better counter the higher moments there?

Google; ' design of concrete haunched beam '
https://tubdok.tub.tuhh.de/bitstream/11420/1052/1/dissertation_nghiep_Teil1.pdf
 
Baluncore said:
I'm not sure exactly what you mean. Maybe a sketch would be helpful.

The profile of the haunch will depend on why you are using a haunched beam. Do you want to minimise the beam weight by moving material from near the middle to the supported ends so as to better counter the higher moments there?

Google; ' design of concrete haunched beam '
https://tubdok.tub.tuhh.de/bitstream/11420/1052/1/dissertation_nghiep_Teil1.pdf

Hey there, thanks for the reply, I've uploaded the sketch, at the left hand side, the slab are non-suspended slab on top of compacted hardcore, while the right hand side it is a suspended slab, with a cantilever beam, support was added to the pilecap to the cantilever beam to prevent overturning, so my question is how do I design the support (labeled as "?" in the sketch)? Thanks! :D
 

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Is this a real engineering job or a homework exercise ?
 
Nidum said:
Is this a real engineering job or a homework exercise ?

Hi, thanks for the reply, Nidum. This was came up from my supervisor on the "practical study" in my university. It's more like a capstone design. We used software to generate the reinforcement, but hand calculation must be included.
 
aaaaa-jpg.113714.jpg


Bit of a stretch to call that a haunch - it's more like half of the total structure on that side of the upright member . There is not nearly enough information given to give any good answer on this problem . Intuitively though I am sure that there are better ways of supporting that platform .
 

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