If you would use a concrete nail to make a one inch deep 12mm hole in a concrete, how long would it take in your experience (let's say the concrete mix is 4000 psi)?
What strength (in psi) before the concrete nail can no longer be a concrete nail (meaning impregnable)?
And what's make a...
A building was designed for 3 storeys with concrete roof slab. What if the beams and slabs of the roofslab won't be put yet but the 3 meter columns already arise that is open ended (without any beam connections on top of it). Is there any bad effects for this?
Hi, has anyone designed elevator for low-rise such as 3-storey where the weight of the elevator is carried by the main beams and columns and not its own box core?
I notice some buildings have basement parking (at least one level) and it is under rock. This means beside and surrounding the basement are solid rock. During seismic movement, won't the rock just break the wall and exterior columns of the basement?
Given a 3000 psi cylinder block with 4" diameter and 8" height in a compression test machine. When the test compression is equal to 1500 psi, what is the corresponding tranverse poisson's strength or pressure (in psi) as it expand outward in let's say the middle of the cylinder (transversely)...
Bars extended outside concrete needs to be cut using acetylene instead of saw which can take long time. What is the behavior of concrete when it is torched with acetylene?
Would it hurt to support the open end corner of a 2-meter RC cantilever? Has someone tried it with an i-beam? How would you attach it to the rc cantilever open ends at the corner or sides (you can't put the i-beam in front because it will block the view of the store)?
How do Ground floor slabs that are put on top of soil behave seismically with respect to the building frame? Note second floor slabs are connected to beams, but ground floor slabs are not connected to any ground beam but are free floating against the soil. How does it behave during lateral shaking?
When you have tight column formworks set up and ready for pour. Do you really have to pour a liter of water to wet the old column surface at bottom of column or pour a liter of grout before main pour? What is the purpose of such? What do you usually do?
If you have a 4 meter height column from foundation to second floor. How thick can you wrap the column with concrete above foundation (add-on pedestal and not monolithic) and without drilling any dowel to either column or footing before it can become significantly stiff to turn into a 3 meter...
It is said that bigger footings have more seismic resistance... that is why torsions occur, where different sizes of foundations can rotate the building. Does this mean that for neighbors with different foundation sizes, the distances between the neighbors would change after a seismic activity...
In a beam with vertical dawel at the bottom spaced every 1 foot to attach concrete 0.1 width by 0.3 depth or drop wall to put windows, can the concrete attachment or addition affect the shear or moment behavior of the beam? But this is commonly done to accomodate windows or doors undeneath beams...
Can anyone point me to a picture of the appearance of steel bar when it yields in compression (not tension which simply stretches beyond elastic limit) provided it didn't buckle due to the ties being close together? If you can't find a picture, what describes what happens. Ty.
When a member is subjected to combined axial compression P and moment M, it is usually convenient to replace the axial load and moment with an equal load P applied at eccentricity
e=M/P. The two loadings are said to be statically equivalent.
Eccentricity of a column load is calculated from...
