In negative moment, the flange in T-beam has additional tension strength and no compressive block advantage (which is on the bottom), and many codes ignore the contribution of the flange in tensile strength. I guess Etabs ignore this too.
How about the compression block at positive moment in...
Oh, the reason for the above is because I decided to use shear reinforcement for maximum seismic loading resistance and it has to be done now before ceiling are put to cover the beams.
I'm getting convinced T-beams have advantage in the compression strength at midspan. I think it doesn't have...
20 psf would be considered the superimposed dead load. How much do you allowance for SD load for residential, office and retail/commercial?
In your experience, or materials you have handled before, what's the psf for pavers you have seen? 10psf? 5psf? or equally 20psf too?
What membrane...
The designer originally designed the U-shaped carbon fiber wrap. It is I who insist that it be wrapped around the beam (full carbon fiber wrap) to avoid debonding. He said I can do either way. Just have to be careful not cutting any bars. So I solely decide whether to wrap full or U-shaped...
If the cement topping will be 120lbs/cf.. then it is 120 * 0.1667 (2inch/12 inch) = 20 lbs/square foot for the topping material??
If yes. How about pavers. Is it heavier or lighter than the cement topping? (and by how much approximate)
The waterproofing product is described here...
No other designer in my country wants to peer review another designer work. That is why I have to backtrack and reverse engineer the plan to do the manual computations. Now i'm doing manual calculations of the interaction between the crfp and the internal stirrups (designers in my country don't...
Please see attached file of the crfp detail.
Next week. Something will be implemented that has never been done in the country. It will be first so I need some tips.
The crfp span detailed is from center column to right and center column to left.
The 100mm slab is 2.5 meters by 5.7 meters. The...
If a concentrated point load is acting on the midspan of a beam, the shear diagram would big shear in the midspan to support. Is this span called the Shear Span?
When designing a beam. How much do you take into consideration the shear span to depth ratio and it's resistance to shear?
Do you...
Has anyone tried this?
The roofdeck will be topped off with 2 inches of cement. How heavy are cement compared to concrete with gravels? What is your experience on putting 2 inches of cement on top of a waterproof membrane (if structures can support it?)
What happens if you use chipping hammer on edge of beam and slab to make a hole in the slab to fully wrap around the beam a carbon fiber sheet? Would chip hammering the edge damage the beam? For those who have used chipping hammer before, what do you think?
What do you think about steel plates epoxied (full structural epoxy) on sides of beam for shear strengthening?
Steel yields and not brittle while FRP are brittle. So steel plates could be safer and more effective?
For 2, It's relevant in that in shear in beams, diagonal cracks occur. This can be resisted by the strain of the fabric in confining the shear diagonal cracks.
About 1. Right. 28 Mpa of concrete is same for any sizes of concrete. So in the carbon fiber.. since it's a sheet... then I wonder how...
Ingenuity. Are you describing the Fyfeco Tyfo Composite Anchor technique? Or is it another brand. Because in the Tyfo Composite Anchor. What the local branch applicator described is they just drilled a 50mm depth of hole (as deep as concrete cover) on each side of the beam and just insert it to...
I talked to them. They didn't core the slabs. What they did is to wrap the ends of the carbon fiber and insert it to a 50mm hole drilled on beam just below the slabs.
The designer said I can put hole in the slabs every alternative of the strips. Meaning every alternative carbon strip will be...
Can you see anything wrong with chipping the edge of slabs to enable hands to enter it and for carbon fiber to be wrapped around beams and then epoxy back (epoxy grout) the slabs avoiding cutting any rebars? Would this be as strong as original slab? Why and why not?
Designer has released the retrofit design. It's composed of Carbon Fiber 4 inch width distance 4 inches apart. They said it's up to me if I want it full wrap but they think U-wrap under the T-beam is sufficient with 2 dowels stick to each side and below. They haven't heard about internal and...
