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  • Users: jjeng2
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  1. jjeng2

    Reinforcing Joist Floor

    I have a steel joist floor that I did not design but discovered was underdesigned while analyzing for additional loads. 14k3 spanning 27.5' at 2' c/c. 4-1/2 slab on 1/2 deck. First Floor Retail Load. The entire floor needs to be reinforced. It is a strip mall so adding joists/beams or...
  2. jjeng2

    PEX Tube in Slab on Grade

    I have a slab on grade that has been designed as 6" per the ACI/PCA method for point and distributed loading. The client wants an alterante which will include a heat/snowmelt system which will consist of PEX tubing at 8" c/c. Are there any ACI references to account for this within the structural...
  3. jjeng2

    PEX Tubing in Slab on Grade

    I have a slab on grade that has been designed as 6" per the ACI/PCA method for point and distributed loading. The client wants an alterante which will include a heat/snowmelt system which will consist of PEX tubing at 8" c/c. Are there any ACI references to account for this within the structural...
  4. jjeng2

    Reinforcement of Cold Formed Chord Joists

    Does anyone know of a method or have any experience reinforcing Bethlehem Steel H or J Series Cold Formed Chords Joists. I also am looking for a way to attach struts/angle frames to the joists. The chords are shaped like a U with wings. The total chord is about 5” wide. The top chord faces up...
  5. jjeng2

    No Cap and Base Plate

    I am designing a modular structure that will be assembled in the factory. Its a small 15X20 box. Typically, they weld all the steel directly to each other. I dont have a problem with welding filler beam webs directly to girder webs but...they weld the tube columns directly to the top flange of...
  6. jjeng2

    Replacing Pocketed Joists-Old Structure

    I have an old building that is being renovated. The first floor framing is essentailly all destroyed by termites and the entire first floor must be rebuilt under the existing structure. The existing floor joists are pocketed into the fieldstone foundation wall. We are going to put new joists in...
  7. jjeng2

    Wood "Moment Connection"

    Im not sure if this is possible or not. My gut reaction was that it wasnt but after thinking about it, maybe it is, but I need to find a good reference. I have a existing paralam structural ridge that is going to be extended approx. 10'. The client wants no posts, support, etc. under the splice...
  8. jjeng2

    Boulder Retaining Wall

    I have a client who has an already installed retaining wall which is built in steps. It varies from 2'-10' in height. I have not seen it yet but he said the boulders are the size of cars. The town engineer wants calculations submitted. To me, this is just a pile of rocks and it would be tough to...
  9. jjeng2

    Fieldstone Foundation Rehab

    I have seen this condition before in Inspection Only projects and when have had to remediate, generally took an approach of installing as much of a new foundation as possible. In this case, it is an historical renovation and the existing foundation must remain. I have a fieldstone foundation...
  10. jjeng2

    Steel Roof Cantilevers

    I have a small(approx. 50'x 50') addition to an existing retail building. The addition is bounded on three sides by existing walls and there are a lot of corners and angles. In trying to come up with a preliminary scheme and col layout, I figured it would be better to minimize disturbance to...
  11. jjeng2

    CA Code Question

    I am in the early stages of planning a rooftop heliport in CA. I purchased the CA Code(Part 2, Vol 2) and this has all the loading and design info I need. I am going to have to purchase Part 1 because several classification requirements are in it. I need to have an answer to my client on Monday...
  12. jjeng2

    CA Rooftop Steel for Heliport

    Im going to research this over the weekend but wanted to see if anyone had any comments before I looked into it. What are the requirements for and where would I find them for a rooftop steel frame/dunnage to support a Heliport in CA? Im primarily referring to seismic. Not sure where steel...
  13. jjeng2

    Retaining Wall on Steep Slope

    I have a 90' long retaining wall with a curved 90 degree bend(about 35 feet one dir, curved portion, 35' perpendicular dir). Both sides of the property slope away steeply. Basically we are taking the top of the slope and leveling it out to have a little patio extension. The wall will be about 5'...
  14. jjeng2

    Foundation Underpinning

    Have used this fix once before in a situation where contractor screwed up and had to come up with something. This time I think it lends itself to the application. Wanted to know if anyone had any opinions on my methodology. Have an old brownstone that has brick walls in pretty bad shape. They...
  15. jjeng2

    Steel Cleaning/Painting

    As part of an existing building rehab I am specing to clean and paint all exposed steel including lintels in interior brick bearing walls. I thought I had the SSPC book but apparantely do not. This is a mildly corrosive environment with some moisture from the masonry walls and has experienced...
  16. jjeng2

    Cinder Block House

    I have a residence that was constructed with cinder block and is about 40 years old. The foundation is 12" block and the bearing walls are 8" block. The masonry was poorly constructed with some mortar joints overflowing and some not completely filled. Currently it has a full basement and a...
  17. jjeng2

    Below Grade Masonry Walls

    I was recently in a meeting with an arch. and said something stupid and had to fumble to recover. I wanted to get some opinions on this. My background is primaraly commercial buildings. At my old job we alwalys detailed all masonry walls below grade to be filled soild. Im assuming this was just...
  18. jjeng2

    Cutting Glu-Lam-Connection

    I have an existing glu-lam roof beam that is being cut to accomodate new construction. I want to bear the cut end on a new masonry wall. It will not be at the top of the wall. It will be "built into" the wall. Any advice on how to make this connection?
  19. jjeng2

    Loading in Pools

    I have some potential work with a pool contractor. I would be submitting re-bar drawings to local building departments. Off the top of my head, I would look at a pool like this. 1. As a series of retaining walls(If the pool was empty) 2. With fixed soil pressure and varying interior...
  20. jjeng2

    Help-Garage Slab

    Ive done this calculation many times before in my old job but Im on my own now and dont have any reference calcs. Im doing something really stupid wrong but I cant figure it out. I have a large garage in a house with a basement under it. The max. span between filler beams is 9'. Im using 18Ga...

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