We have a project where upon removal of the forms there was one column that had significant voids at the top. Apparently, they had to use a sonotube form on this column and it blew out at the bottom during placement.
The other columns though are also showing cracking patterns that I have not...
thread507-103228
We are designing a mobile platform (see attachment). The client has indicated that the platform will be used by maximum of (2) workers at a time. We are intending to use 300 lbs to account for a worker + tools.
OSHA requires we design the platform for 4x the maximum intended...
Please see the photo from the pre-pour and out typical detail below. We had specified to use core plug to keep the grout from penetrating into the cores. The contractor did not order these in time and is now proposing to use masonite board as shown in the picture below.
We believe there is an...
We recently received a deferred submittal for an aluminum canopy that is cantilevering from our our structure (HSS girt), see image below.
In the Design Criteria, the signed and sealed submittal had the following notes:
"Roof maintenance not permitted during design event(s) as roof live...
In our market composite steel beams with concrete on composite metal deck is a common framing system, however it's cost increases dramatically on smaller projects (footprint less than ~10,000 SF) due to many reasons with one being the cost of renting the Nelson stud guns to install the shear...
I am designing an 8'Ø x 26' deep x 10" thick wet well. I have studied the PCA publication "Circular Concrete Tanks Without Prestressing" however the H^2/Dt values provided in the charts don't come close to meeting my calculated value (89.3).
Is there another resource or is my only option to use...
I have a 8'0" wide double door with a loose lintel above that is supporting brick veneer. The backup wall is CMU. Should I anchor the loose lintel into the masonry lintel in order to transfer suction forces or it is standard practice to rely on the brick ties? Is another option to design the...
All,
Every year I get glowing reviews from my project managers telling me that I am exceeding expectations and ahead of the pack in regards to my peers, however I do not feel that this is being adequately portrayed to my boss whom I have never worked with directly. I am basing this on the fact...
All,
I am going to be giving a presentation to first year graduate engineers about the construction administration phase of a project. In order to provide concrete examples on the importance of the CA phase I was hoping to use some specific example of when a major design flaw was caught or...
Are there any guidelines or code statements in reference to what are acceptable CFMF attachments to structure? I have a steel building that has exterior stud walls. In the shop drawing the studs are shown attaching to the bottom of wide flange beams for lateral support. We did not account for...
Received a geotechnical report for a project site that has expansive clay soils. In the report is states that the belled pier capacity is to be reduced when the spacing of the bells is less than 3 bell diameters (clear space) based on the larger pier. The reductions are 40% for 2-3 diameters and...
Is there any concern with welding a steel angle to 18 GA deck via fillet weld (1/8")? My initial thought it no since the deck is only .0478" thick. I believe the weld will burn through compromising the strength of the deck...
Contractor sent out the steel pre-construction agenda and under Field Modifications to Structural Steel it has the topic "Pre-approval for spear reaming to fair connection misalignment".
It is my understanding that this means that when they have bolt holes that do not align to the point where...
I am a graduate engineer for a reputable structural engineering firm. My working title at the company will be graduate engineer until I become a licensed engineer. My gripe is that I see contractors place the title engineer on everything, i.e. project engineer, field engineer, etc. I understand...
Had a client who was installing an outdoor patio adjacent to their house. The previously had issues with the concrete "sweating" so they wanted to add a vapor barrier. I saw no problem with this but the contractor is adamant that it is bad to install a vapor barrier under an outdoor slab. He did...
Looking for best practices tips for modeling a long span truss. The truss will experience high point loads at panel points as well uniform loading from a composite deck. In my model should I release the moment in the truss chords at each panel point or only where a splice connection will be...
The policy is my office is that we used cracked section properties per ACI for wind strength analysis, however we use the gross section properties for serviceability analysis. My question is why can this be assumed. Let say for example that you have a design wind storm in the first year of...
thread507-337483
I received a submittal for a ship ladder which services a mechanical room in a stadium. Per ASCE 7-10 §4.5.4:
"The minimum design live load on fixed ladders
with rungs shall be a single concentrated load of 300
lb (1.33 kN), and shall be applied at any point to
produce the...
Can you place vertical reinforcement in 4" masonry blocks? I was told that you can't but after getting my hands on some it looks like you could get one bar.
I am look for a drawing template that I can trace typical structural shapes from. I want to use this for sketching up details. My project manager has some but does not know where he got them from. Does anybody know a good source?
