Hi All, I all trying to find a reference to the information posted in the link below to understand the calculation of a concrete spring constant, as indicated in the link below.
https://www.eng-tips.com/viewthread.cfm?qid=369976
Unfortunately, the reference in the Eng-tips link is no longer...
Hello, I am looking for advice on placement of control joints in a Slab on Grade.
The design drawings call for placement at 4.5m. The contractor has used isolation joints (as shown in blue) and there are two openings in the slab (sump in centre and jib crane foundation on the right hand side)...
@jayrod12,thanks for the response, the rational of the wind hitting the wall above the canopy putting downward force on the canopy makes sense and is a good explanation. I was also considering using the C&C diagram in Figure 4.1.7.6.-C, but opted for Figure 4.1.7.12 A&B instead for 2 reasons...
Hello Canadian Engineers, I am designing a covered breezeway (roof and 4' high plywood barrier) adjacent to an existing building, there is no gap between the breezeway and the building. As well they are similar heights, as the breezeway roof will be ~2" lower than the building roof and sloped 2%...
@Kootk:
Thank you, this make sense to me, and I will regurgitate for my own understanding
If stress distribution is considered elastic then then it would look like this (and the area under the curve would be represented by 2/3 BxH):
If stress distribution is considered plastic then it would...
@271828:Thank you
Shear Area in this case refers to the area used to calculate the shear capacity of the member in the strong and weak axes.
When using STAAD and creating a section in their sectionwizard application, the shear area is not automatically generated (other properties are...
Jayrod12: Thank you, I agree. I was planning to manually input the shear areas for the W12x27 section alone (conservative), and see if there was any failure under that condition. I just wanted to create a model as accurate as a possible (and to know for myself how this would be obtained), but...
Hi all, I am trying to calculate the shear area for a built-up section for input in STAAD.
I have found a number of resources to determine built-up section shear area, but have not bee able to find any guidance on calculation of the shear area for this specific configuration: W-Shape with a...
Hello All, I am trying to identify a specific type of grating, bearing bars are a inverted U/V shape with square bar stock placed perpendicular to the bearing bars (see attached photo).
The original construction was from the 1960s and is located in Labrador, Canada. This type of grating is...
@KootK @centondollar
Thank you for the responses, I agree with your statements.
I have seen this used in other foundations founded on bedrock, and I wanted make sure I didn't miss anything.
Thanks jayrod12, I was thinking the same thing, but it's nice to be able to prove through calculation.
Moment is not a concern for this footing, as the baseplates are pinned (2 anchor bolts interior to the column flanges) and the building has a lateral force resisting system (bracing...
Hello All,
I am looking at an existing footing. In trying to determine the shear force acting on the footing the calculation based on CSA A23.3 shows the location where i would take the shear force to be outside of the physical dimensions of the footing. ab (distance from pier face to edge of...
Response to the above questions:
1) The building was designed and constructed ~60 years ago. At that time the code which governed design did not account for any drift loads. The building where these trusses are located shares a common wall with another building with a ~50ft higher roof...
Hi Redacted
Sorry for the confusion, hopefully my explanation below clarifies.
The chamber was installed with a small 8" deep depression (sump) in one corner of the concrete base. The chamber floor sloped towards this depression to collect any water in the chamber.
In the depression in the...
Straub46: Correct, I need to more than double the area.
This is a truss which forms part of a mill bent in an open shop. These bents occur at 20' intervals. It is not feasible to add more intermediate bents or trusses.
Web members are star arranged angles and have an available 10mm spacing...
Dik: Yes, agreed, the round bar was my initial thought. I need to add ~7000 mm2.
Looking at this now, I should be able to use 1-1/4" x 4-1/4" flat bar to get the necessary area, and this should be able to be ran continuously without interfering with the web member connections.
dik: We did look at this as an option initially, the round bar needed would be ~3" diameter and would not be able to be continuous at the web members. That is an excellent point regarding the intermittent welding.
lexeng18: The first detail (with inverted angles), there would still be the same...
Hi, I have worked with underground chambers that required to be dry, we installed exterior drainage to a rock filled sump pit with a 4" pipe with a back flow preventer (water could only flow out). This functionally did not work as the water table was higher than the sump, and some of the back...
Hello All,
Canadian structural engineer here. I am currently exploring options to add section capacity to an existing truss. The work would be required to be done in place at ~30feet from the slab below.
The top and bottom chords are T-Sections
Truss Span: 50 feet
Truss Depth: 5 feet
Top...
