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  • Users: Robbiee
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  1. Robbiee

    Diaphragm chord design with cold-formed steel (CFS)

    Hello all, Looking to see what works better in terms of the design of a diaphragm chord in a building constructed with hollow-core slabs, CFS stud walls as load bearing walls and cast-in-place concrete shear walls. The two options I am thinking of are: 1- CFS straps at the edges of the slabs...
  2. Robbiee

    About selling a "one-man-show" business

    Hello, Can a firm with one engineer and one CAD person be sold? I was thinking, since getting closer to the end, let's see what others say.
  3. Robbiee

    New slopes for suspended parking slab

    Hi all, We have an existing suspended two-way concrete parking deck slab that needs the surface slopes increase. The slab design loads are fixed and can't go over them. The design includes 4" of asphalt and max. 4" of gravel. However, to achieve the required slopes, we need up to 12" of gravel...
  4. Robbiee

    Trying to avoid expansion joint

    Hello, We have a site where we will build 130mx80 one level underground basement/parking garage. There are two concrete 6-storey buildings above the basement that will occupy part of the footprint of the basement and the rest will be used as surface parking area and roads. Please see attached...
  5. Robbiee

    Cracked walls in a parking garage

    Hi all, Looked at a parking garage where two walls were cracked at a couple of locations. The attached images show these cracks. It was clear to me that the cracks happened because the expansion joint in the roof deck was not continued into the walls. Now to repair, I am suggesting to create...
  6. Robbiee

    Jack-post like column

    Hi all, The attached is an image of a concrete column in a parking garage that has a steel top like a jack post. Wondering if anyone knows anything about this "jack-post"; properties, why it was used, capacities, ...etc. Thanks...
  7. Robbiee

    Controlled Modulus Columns-your experience

    Hello, On one of our new projects, and driven by cutting cost, the ground improvement method of Controlled Modulus Columns is being offered as alternative to using deep foundations. could you please provide your experience and comments on this method? The contractor is guaranteeing a uniform...
  8. Robbiee

    Using Hollow core precast slab in stead of structural slab on grade

    Hi all, Thinning of using a Hollow core precast slab in stead of structural slab on grade. The structural slab on grade is needed because grade can not support the slab and it needs to be desiged as elevated slab. Being too close to grade, I am thinking the precast slab might have some...
  9. Robbiee

    Responsibility of designing the anchor bolts

    Hi all, With almost every project that involves a pre-eng steel building, the disagreement on who's responsible for the design of the anchors bolts comes up. The engineer who designs the pre-eng building decides the number, size and material of the anchor bolts, but leaves the embeddment depth...
  10. Robbiee

    Duration of temporary shoring system

    Hello all, We provided temporary shoring for an elevated concrete parking deck due to deterioration; spalling concrete and corrosion in rebars. The desk is still being used to park cars over. The replacement of the deck is being postponed year after year for now about 4 years hence, the shoring...
  11. Robbiee

    Horizontal Cracks in foundation wall

    Hello, any input is appreciated. Was called to inspect a concrete foundation wall of a townhouse. The wall separates the house from its garage. The crack first was at about 12" below the top and after monitoring for few months, the width of that crack increased slightly by about 1mm, but a new...
  12. Robbiee

    Ledge in a masonry block wall

    Hello, Like they used to do with cantilevering brick to create a ledge, do you do/have you done something like this? if not what is the issues with doing it? All inputs are appreciated...
  13. Robbiee

    Ledge beam with no reinforcing in the ledge

    Hi all, During an expansion joint repair work for a parking garage, we discovered that a ledge beam has no reinforcing in the ledge. Please see the attached sketch. This building is over 50 years old and had no issues with the ledge. When we reviewed the existing drawings, we confirmed that the...
  14. Robbiee

    control joints in a SOG with in-floor heating

    Hello, Have an 8" thick slab on grade with welded wire mesh(WWM). This is a slab for a service area of heavy equipment and vehicles. The slab will have in-floor heating pipes that need to be 2" below the surface and installed above/and tied to the WWM. The minimum depth for saw-cuts is 1/4 of 8"...
  15. Robbiee

    When to suggest tearing down and rebuilding a structure?

    Hello, When a client asked you to carry out a condition assessment of his building and provide your opinion on the options of tearing down and rebuilding versus renovating. Assuming the building functionality is still satisfactory, what are the criteria for favoring one option over the other...
  16. Robbiee

    Snow Melting System for a roof

    Hello, I was asked if a snow melting system can be used on an existing roof that will have a higher roof beside it. The snow melting system is to avoid reinforcing the existing roof for snow accumulation and drift. I have never used this and I am not sure if it is allowed by building codes or...
  17. Robbiee

    Steel column axial strength

    Hello, I went to check a steel column in a parking garage that had some corrosion at the bottom. The column supports 6 stories above and is subject to only axial loads, no lateral braces and no moment connections. After cleaning the corrosion there was some loss in the sectional area. The column...
  18. Robbiee

    Modeling flat slab with RAM Elements

    Hello, Has anyone modeled a suspended cast-in-place concrete slab as shell elements of RAM Elements? I was thinking of doing so for a small 2x3 bays of an underground parking garage roof. Thanks for any input.
  19. Robbiee

    Help identifying this crack pattern in concrete walls

    Hello, I was asked to inspect and provide opinion on the cause of cracks developed in load bearing end walls of a building. Please see attached. The building superstructure is precast concrete, 23 storey high and rectangular in footprint. These cracks, as seen, start from the wall vents located...
  20. Robbiee

    Adding stories on top of old buildings

    Hi all, We are getting requests from developers to add 2 or 3 stories to existing old brick buildings. I tell them: this means the existing building will now need to meet the current code, which is challenging, specially for seismic loads, and therefore, we need to provide new lateral resisting...

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