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  • Users: rlewistx
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  1. rlewistx

    Preliminary Reactions for Pre-Engineered Metal Building

    I've spent a good amount of time searching through the forums and have not found a thread addressing this. For many years I had a great relationship with a PEMB supplier rep. He would give me preliminary column reactions for all my buildings in exchange for having the opportunity to bid on the...
  2. rlewistx

    uniform slab thickness post tension double pull cable length

    Uniform Slab Thickness post tension slab on ground foundation: At what cable length should I consider changing from a single pull post tension cable to a double end pull post tension cable? At what length should I consider changing from a double pull cable to breaking the slab into multiple...
  3. rlewistx

    Cameroon Seismic Parameters

    I have been asked to design a water tower stand in Dimako, Cameroon. I'm hoping there is an African engineer monitoring this website who can assist with information. I have been unable to determine the type of seismic activity of this area. Are there seismic design parameters, such as Ss & S1...
  4. rlewistx

    SUPER FLAT FLOOR REINFORCING

    I'm looking for recommendations for minimum longitudinal reinforcement for a super-flat floor. I have a requirement of Fmin=65 and am designing the strips for the floor. I have the strip joints located in the middle of the storage racks. The strips are 200 feet long. What is the...
  5. rlewistx

    Protecting Saw Cut Face of Wall

    I have a precast concrete building where the exterior wall will have a large hole cut out of it. The wall is reinforced with WWF. It is 5 inches thick. The wall has an exterior exposure. I have 2 questions: 1. What would be the recommended way of protecting the WWF of the saw cut face from...
  6. rlewistx

    Need Section Propertes of Chinese Steel

    I'm working to add some catwalk platforms to a steel frame power plant. The steel was designed and manufactured in China shipped over. Most of the steel shapes have Chinese designations. I have found some of them, but can't find quite a few. I need section properties for: BH550 BH600 BH680...
  7. rlewistx

    PARKING GARAGE WIND LOADS

    I'm looking at the wind loads on a parking garage. It needs to be 50% open for ventilation. I looked at the definition in ASCE 7-10 of a 'Building, Open' (at least 80% open) and 'Building, Partially Enclosed' (total area of opening in a wall that receives positive external pressure exceeds the...
  8. rlewistx

    industrial post-tension slab on ground for crack control

    I have a client who really does not want any visible cracks in his floor as he wants a 'show-room' floor. I am considering post tensioning it and want to get some feedback on others who may have done is for slab on ground crack control. The slab area is approximately 95 feet x 75 feet. 3...
  9. rlewistx

    Chinese steel section properties

    I'm working on to additions to a project in the USA that has steel shapes from China. I see shapes designations like HN500, HN446, HM440. I'm looking for a website that will give me section properties for the Chinese steel. I would like full properties such as A, Ix, Sx, Rx, etc. Any...
  10. rlewistx

    Application of Subgrade Modulus in Mat Footing Computer Design

    I've searched the archives and found 249 threads dealing with subgrade modulus. I haven't read all of them, just enough to get frustrated. I don't see the question I have discussed. It has to do with the application of the subgrade modulus in a finite element computer analysis. I've worked...
  11. rlewistx

    THINSET STRUCTURAL CONCRETE TOPPING

    I'm evaluating a structural slab. It was poured about 3 weeks ago on a hot summer day. The slab is about 85'x85'. The set time got away from the contractor and the top surface looks terrible and has high spots (photo attached). It is not flat. The slab is needed to erect some equipment on...
  12. rlewistx

    Crested Weir Wall Design

    I believe I have the terminology correct in the title. I'm designing a concrete wall V-notch weir. It is about 15 feet tall at the middle and 300 feet overall length. My questions has to do with the concrete wall forces. 1. In the vicinity of the weir, will I have added forces on the wall...
  13. rlewistx

    Pump Barge Bouyancy Factor of Safety

    I hate to double post, and I think it is against the rules, but I posted this first in the ship building forum and the is very little activity there. I'm hoping maybe someone in the general structural forum may be able to help. I've been asked to check the buoyancy of a pump barge on a lake. I...
  14. rlewistx

    Barge Bouyancy factor of safety

    I've been asked to check the buoyancy of a pump barge on a lake. I can calculate the theoretical numbers ok. What I want to know is what is the industry standard of the factor of safety against submerging? What should the minimum ratio be of the max. potential buoyant force divided by the...
  15. rlewistx

    DESIGN STANDARDS FOR TRAILER STRUCTURES

    I'm doing some preliminary research on what is required to design parts of a structure that will be used on public roads. Specifically, I'm considering parts of a trailer used for oil field equipment transportation. I'm assuming there must be some designed standards that are geared...
  16. rlewistx

    Exposed Scored Concrete Slab

    I’m getting ready to start an office project that will have exposed stained concrete slabs on ground in East Texas. The slab will be scored in a decorative pattern. Since it is exposed and decorative I’m considering post-tensioning the slab to minimize cracking. Post-tensioning is not...
  17. rlewistx

    DIN 4150 & Support of Vibrating Machines

    I have to design a frame supporting vibrating screen equipment. The equipment load is as follows: Total dead & live load (product) =7,200 lbs. Dynamic horizontal force = 150 lbs. Dynamic vertical force = 210 lbs Operating speed = 1175 RPM There are 4 pieces of machinery to support on the steel...
  18. rlewistx

    Model Airplane Wing Design Project

    My son is working on a college project to design a model airplane. The plane has a weight limit and must be able to carry a certain amount of weight. He is looking for some simple guidance for designing some of the parts of the airplane. He specifically needs design information on a wing...
  19. rlewistx

    Chemical Resistant Slab Sealer

    I need a product recommendation for a slab-on-ground surface sealer. The product must give a hydraulic conductivity of less than 1x10^-7 cent/sec. The slab is also subject to forklift truck traffic. Any suggestions would be appreciated.
  20. rlewistx

    Exterior Deck Construction

    I have a project I’m designing for a camp that is a two story dining hall and meeting room building. The lower level is used for the meeting rooms and the upper level will be the dining room. The floor plan calls for a deck outside the dining room along two sides. The deck is about 18 feet...

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