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  1. BFstr

    Black Marks on Steel in a new pre-engineered bldg.?

    Colleagues Anybody know what these marks might be? Are they black mold???? Thanks https://files.engineering.com/getfile.aspx?folder=c11c6c1f-35a5-4b21-bb87-74057dadcc3a&file=Black_marks_on_steel.pdf
  2. BFstr

    Steel Road Plates

    Anybody knows of a publication or video helping me to size a steel road plate? Thank you
  3. BFstr

    Simple Strength of Material question

    Hi We are in debate in office on the correct answer to this problem: A uniform straight rod AB (A if fixed, B is free end)with total length of 3 meter is under some axial loads that causes strain of Ɛx = 0.01x^2 What is the axial displacement of the end B in terms of centimeter? Interesting...
  4. BFstr

    Rusted New Steel - What's the solution

    Hello Experts, May I ask what do you think is solution for this problem.... Columns, beams, girts and purlins are rusted as shown in the pictures... What is the solution to problem? Thank you https://files.engineering.com/getfile.aspx?folder=a619e326-5e6a-467a-84c6-6d3b58a8a161&file=IMG_0220.jpg
  5. BFstr

    Reinforcement around openings in slabs and walls

    Hi Every one, Dose anyone know the principals of sizing extra re-bars (diagonals, and vertical, horizontals) around wall openings in reinforced concrete walls and slabs? Is there calculation or just code requirement? The wall that I am working on has a 14" pipe going through at the base of...
  6. BFstr

    Retaining wall drainage system

    Hi Everyone, I am trying to understand the use of the perforated drainpipe located along the backside of the retaining wall. I don't understand how it collects water behind the wall? Do they have any holes that water go to them? Is there any reason that they need to be perforated? Is there any...
  7. BFstr

    Wingwall question

    I have to decide about the angle for a wing wall. What impact the angle has in design? I have seen 30 degrees, 45, 60 and sometimes even the wing wall is perfectly perpendicular to the head wall? My case is a 10 foot head wall which I have no clue what angle do I use for wings? Also anyone...
  8. BFstr

    Pump foundation

    Hi everyone, Can anyone please tell me for a a pump with following specifications: Power 7.5 hp Frequency 60 HZ RPM 1200 Weight 857.5 lbs Dimensions 52 " length, 15" width, 28.07" height Do I need to provide a separate foundation for it or I can just lay it on the slab -on -grade with a 6"...
  9. BFstr

    Engine room needed or not?

    Hi I am trying to figure out if we are required by Building code or Fire code or Electrical code (Any code) to build a room for a Natural Gas Fire Generator (A small one). The whole story is that client want to put a small Natural Gas Fire generator in their warehouse in the plant. Do we need...
  10. BFstr

    Code that requires us to have an Engine room

    Hi I just graduated from school and have started a job. My boss is assigning me to figure out if we are required by Building code or Fire code or Electrical code (Any code) we are required to build a room for a Natural Gas Fire Generator (A small one). The whole story is that client want to...
  11. BFstr

    W shape on masonry wall detail

    Hi Everyone, I am looking for a detail where the w-shape beam seats on masonry wall. How it is connected to wall and how to build a parapet around it? Also this beam has 1.57 degree slope how this can be detailed on top of wall? I appreciate if anyone has a detail Most books have detail for...
  12. BFstr

    Boiler on slab on grade or an individual footing for it

    Hi, I have two boilers that have to be housed in a cmu building. They weight about 83110 lbs each. I am wondering if I can simply and directly seat them on a 6" slab -on - grade? Or I have to design those heavy/thick isolated footing for each of them separately. Next question is since the...
  13. BFstr

    Boiler Room Design Consideration

    BFstr (Structural) Aug 12, 2009 Hi Everyone, I am designing a Boiler room (or a boiler building only has one room). I don't know what things I take into consideration in my design because of specific function of building. Walls are from CMU, for roof I am planing to use W-shapes and one...
  14. BFstr

    Effective wind area

    Hi everyone, I am working on wind load for a CMU bldg which the wall height is 24ft including 2ft parapet. I started using Fig. 6-3 page 42 ASCE7-05 Components and Cladding - Method 1. The building footprint is 42ft by 48ft. Wind speed 90MPH. Can any one please tell me what is "Effective wind...
  15. BFstr

    Best roof system on a loadbearing CMU building when stuff get hung

    Hi Everyone, I am trying to see what is practical engineering. I have a one story CMU building (loadbearing walls) which I been told that there is going to be pipes and HVAC units and electrical trays hung from ceiling and the location of them at this point is not determined. My question is is...
  16. BFstr

    Retaining wall near a river bank

    BFstr (Structural) 22 Jul 09 10:13 Hi Every one, I have to design a retaining wall which is close to a river bank. It consists of a headwall and two wings with different lenghts which wings are 45 degrees. I attached the sectional cut of head wall and a plan showing the location of wall to...
  17. BFstr

    Retaining wall near a river bank

    Hi Every one, I have to design a retaining wall which is close to a river bank. It consists of a headwall and two wings with different lenghts which wings are 45 degrees. I attached the sectional cut of head wall and a plan showing the location of wall to river bank. I have few questions and...
  18. BFstr

    Active lateral soil pressure or At - rest ?

    Hi, I am new to this forum so my apology if I am doing in- correctly. My question is when they ask you to design a retaining wall how do you recognize that you have to apply active lateral soil pressure or at- rest? I know by definition if wall moves away from soil we should use active but in...

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