Is this deadman just a pure oncrete without reinforcements? 9

[SatoshiNakamoto09]

Hello, Im just curious if this deadman(attached image) for a suspension pedestrian bridge really just a pure concrete and no rebars/reinforcements?

 

[human909]

I always figured crowd sourcing engineering would come along one day... But I thought that it start with something simpler than a suspension bridge.

 

[SatoshiNakamoto09]

human909

Thank you. very helpful comment. I feel so satisfied

 

[LittleInch]

Don't be ridiculous.

Of course it has reinforcement.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[JStructsteel]

When in doubt make it stoubt

 

[BridgeSmith]

I don't want to be rude, but I need to be blunt here. This question, and several others you have asked, make it clear that you are not experienced enough in structural engineering to be taking on a design of this complexity and importance. There will be lives at stake if this bridge were to fail, potentially many lives. You need to leave this to an experienced bridge designer. This is not a project for a beginner. If you don't know how to calculate what reinforcing is needed, and where it needs to be, in that anchor block, and certainly if you're questioning whether it needs reinforcing, you are nowhere close to having the skills to design this bridge.

 

[SatoshiNakamoto09]

I am a former structural design engineer but never tried designing a pedestrian suspension bridge. I will now be contractor of this project but based on the plans and as what I have also seen from other plans, this anchorage/deadman has no rebars/reinforcements shown so I assume this has really no required reinforcements aside from 1 large bar where this main suspension bridge cable will strapped/tied.

I have computed external stability of this anchorage/deadman and found out that it is sufficient with sliding, overturning and uplift with the right FACTOR OF SAFETY.

what I was thinking is that the assumed failure/crack line where it can potentially be break is enough for the pull off due to main cable tension.

Thank you for you effort in writing your comment.

 

[BridgeSmith]

So you're the contractor, and not the engineer? These questions should all be addressed to the structural engineer who designed the bridge.

 

[LittleInch]

Well if you're building it and have doubts about its integrity I wouldn't build it as you will held responsible....

It is unthinking that a block like this has no re-inforcement give that it is under considerable tension and shear forces which concrete really isn't good at....

but are you sure or just not seen the detailed block drawing?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[BridgeNerdGuy]

I will now be contractor of this project

You told us you were designing this bridge in other threads. You've asked for design resources, posted pictures of your structural model, and have asked many other very basic and concerning questions. If you are actually designing this you need to be honest with yourself and the capabilities of your team regarding this project. This is a complex structure type and not a basic design task any structural engineer can handle. Based on the elementary nature of the questions asked, my assessment is you are in over your head on this job and need assistance from professionals who have worked on this structure type before.

 

[LittleInch]

"but never tried designing a pedestrian suspension bridge"

"so I assume this has really no required reinforcements"

How are you so confident about this?

When the bar rips out of the broken concrete block in 5 years time and the bridge collapses I don't think you'll be as confident then.

This needs to stop and you need to start thinking worst case here.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Struct123ure]

No risk, no reward I understand we all want to “Move Fast and Break Things” Mark Zuckerberg... and be rich like him... .
*Disclaimer, please seek help from other professionals if required"

In terms of your question I would have a bird cage (see red top left) of 15M bars for the whole cube. As the others mentioned conc. isn't the best in tension and you want to keep this block of concrete together. Since you are relying on the whole weight of the block you need to keep it all together and can try to resolve the forces so that the red tension arrow will pull on the blue dot of concrete in the opposite corner of the deadman.

If you need to keep the "adjustment box" area open and can't have rebar running across whcih you probably can't, I would do something like the rebar in green having a central heavier reinfroced section and perpendicular areas holding on to it.

What is the spacing... I don't know ... but contractors like 15M@400mm o/c.

On a seperate note, not sure which country or region you are in, but if you have a university around try going to talk to one fo the professors. Seek out civil deparment, most of them are pretty nice people and may be willing to give you free advice.