Hi,
In the mass source in the Etabs software, there is the option in the mass source option to include lateral mass. In their documentation, CSI indicates that "assigned translational mass in the global X and Y and assigned rotational mass moment of inertias about the global Z axis are...
Hi,
I am designing a conic silo which has a foundation as per the attached. the dotted blue circles are the columns supporting the silo. The brown circles are the piles under the raft, having a thickness of 1200mm.
The design is conducted as per Eurocode 2.
When checking punching shear, and...
Hello this is my first time I use a micropile. It has a diameter of 250mm. It will contain reinforcement consisting of 4 high deformed bars with some spiral reinforcement. My question is:
1. Is it mandatory to use grout and not concrete? Is it because I cant go with the tremie up to the bottom...
Hello, this is my first project in a Seismic Design Category D. I am checking the code requirements regarding the deformation compatibility (ASCE7-10 - section 12.12.5).
I have 2 interrogations where I would like to have your opinions:
1. Whenever I obtain the maximum story drift, should I...
Hi
Any ideas how to extract the spectral parameters Ss and S1 for a structure having 100 years design working life ?
It seems that Ss and S1 provided in the asce7-10 are given for 50 years with 2% exceedance probability.
Thanks for the help
HI,
In a torsional structure, the displacement resulting from the lateral seismic analysis will give rise to displacements in the 2 directions ( X and Y).
when comparing the story drift to the allowable one, each direction is to be compared separately to the allowable code limit or the vector...
Hi,
I am analysing a foundation mat with the columns, being on the same axis, are being supported by a thick pedestal (thickening is from above).
I am checking the one way shear and appears that at at d away i am out from the pedestal area and located in the thinner raft.
How do you check one...
Hello
I am asking your opinions regarding the below:
2 separate walls are being extended 40 meters up and they are carrying a staircase from one side and an elevator from the other side.
I am planning to brave vertically these 2 walls by 2 isolated beams very 3.5 to 4 meters.
If these beams...
hello. In reinforced concrete construction, if edge/corner columns are braced by a horizontal beam and the slab has been designed without relying on column stiffness, how can you limit the unbalanced moment absorbed by the column ? i dont assign release to the column since it is a RC...
Hello
I was on a visit to a recently built resort. The client is complaining of many cracks above the doors and windows (attached 2 photos)of the 1st floor. Almost all the doors have the same crack type.
I am suspecting that the lintels may have some inadequate bearing or that the roof above...
Hello
I am dealing wirh a raft foundation with local thickening below the columns.
The general detail i found of bottom reinforcement inside the raft is shown in figure 1. However i dont understand the necessity of the extended part which i have clouded (useless in my opinion).
In such section...
hello,
In a non seismic zone, should the columns stirrups go inside the slab / beam or it can stop below the beam / slab as per chapter 7 of aci318-11 ..
thank youhttp://files.engineering.com/getfile.aspx?folder=7f4703c3-083f-4f5b-88a4-86022394d3b2&file=chapter_7.JPG
Hello,
I am checking a column which is being braced by a beam and a slab from the 2 sides. At the foundation level, it is supported on a raft foundation and is being braced by a retaining wall from the other side as per the attached sketch.
My question is regarding the unbraced height of the...
Hello,
I am considering a retaining wall having a 3.5m height of retained soil and 1.7 meters at the base from the other side. I want to rely on my passive earth pressure. As per my calculations, the passive earth pressure induced moment exceeds the moment coming from the active.
In this...
Hello,
I have 2 independent questions
1- For a cantilever beam where the top reinforcement can not be anchored in the column since the ldh (ACI318-08) is bigger than the columns dimensions, is it ok if i extend the top reinforcement into the adjacent slab and make a class A splice ? (refer...
Hello, i am designing a small structure where it is composed of 1 floor ( ground +roof). The loads are light ( spans between 4 and 5 meters).
Regarding the foundation i am hesitant between 2 scenarios:
1- found my columns at the ground floor level with removing the top 600 mm soil and compacting...
Good day,
I have already asked the below question but would like to hear more.
I have a foundation resting on a crushed stone ( the soil there has been replaced by tout venant). The contractor would like to remove the blinding concrete. No waterproofing membrane is to be placed below the...
hi, I have a retaining wall which has a length of 70 meters. I have introduced expansion joints in the wall at 23 meters.
1 - Is it recommended to have the expansion joint also in the foundation knowing that there isnt any high watertable ?
2 - what is the purpose of putting a dowel bar inside 2...
Hello,
Currently working on a site where they are constructing new houses composed of 2 floors and small spans.
A SPT test was submitted for our review. The N value is so small (N=4) which send us in a very loose silty sand.
The assumed bearing capacity is 8T/m2 according to the general...
The contractor will cast a thick foundation having a thickness of 2.7 and 4.3m in one single phase. No construction joints are allowed.
As this is considered a mass concrete, temperature control is a must. therefore, we are going to cast it during the night and using embedded cooling pipes...
