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  • Users: DMWWEngr
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  1. DMWWEngr

    Inadequate Embedment - Looking for Ideas

    Background: I'm designing a concrete member (door jamb - 8' tall) to support a flood gate. The concrete door jamb will be oreinted vertically and will be doweled into an adjacent wall. Then, so I could sleep at night, I was also going to notch the top and the bottom of the support (into the...
  2. DMWWEngr

    Horizontal Loads from Surcharging Revisted

    Previously I had asked the effect of an exterior surcharge loading (placed on a SOG) and what it would produce for horizontal loads on a basement wall. The last loading was a uniform loading and I got a lot of great comments. As "luck" would have it my employer has changed there...
  3. DMWWEngr

    General Info on Spring Rates

    Can anybody provide general info on spring rates?? Good links on the topic?? I'm curious as to know how they effect the cars handling and how they are considered when designing a suspension. Just looking to build up my knowledge base on the subject. TIA!! --- Andrew
  4. DMWWEngr

    Deflection of Beam Supporting a Concrete Slab.....

    I'm looking for a "rule-of-thumb" for steel beam deflections. I have looked in LRFD and found the L/360 for Live Load (LL) deflections but I can't seem to find anything for Total Load (TL) deflections. I've also searched the archives and nothing came up that applied to what I'm...
  5. DMWWEngr

    Calculating Torsion...

    Real quick question (I hope)... Say you have a beam that that is simply supported by HSS sections on each end. How does one determine the torsion that the beam places on the HSS sections?? Sorry for this simple question...but I can't find any good examples of this in my books. TIA! --- Andrew
  6. DMWWEngr

    Plate cast into wall....

    I'm trying to determine the capacity of a plate cast into a concrete grade beam (wall). The plate is 10"x1/2"x15", there are (8) 3/4"dia x 5" HD studs on the back of the plate that extend deeper into the wall. The plate is mounted vertically (parallel with the face of...
  7. DMWWEngr

    Increasing Beam Capacity

    At work we are looking at changing the loading of a room. The dead load on the floor will be dramatically increased. I have checked and the primary steel beams supporting the load will fail in flexure. However, the beams are sufficent in block fracture, shear, etc. An initial quick check of...
  8. DMWWEngr

    Two-Way Slab...Strip Widths??

    Reviewing two-way slab design and I'm having trouble figuring out exactly how to calculate the strip widths. I'm looking at an example problem. It is a "flat" two-way slab. Spans 26' in one direction and spans 22' in the other. Round column capital of 5.5' (from a 2' column)....NO...
  9. DMWWEngr

    Horizontal Loads on Foundation Wall

    I'm looking at placing a piece of equipment on grade adjacent to a building. This equipment will be placed near (about 4-5' away) from the existing building. What is the most accurate method for determining the horizontial load distribution on the foundation (basement) wall?? I have a...
  10. DMWWEngr

    Masonry Reference

    I'm looking for a good masonry reference book. I would like a book that covers masonry restoration as well as masonry construction options (i.e dealing with moisture migration, etc...). I would hope that I could find ONE book that discussed both in great detail. If not, so be it!! Please let...
  11. DMWWEngr

    Effects of a load on SOG and below grade

    I have a question about loads on slab-on-grades and the effect if has on items below grade. Here's the situtuation: I have a 40,000 lbs load that is essentially uniformly disrutbed over 8'x15' (120sqft).....imagine a water tank. This is to be placed on a 6" slab. 10+ft below grade there...
  12. DMWWEngr

    Analyzing One-Way Slab

    What am I doing wrong here?? I have a 55 year old building with a doubly-reinfocved one-way slab (only one bay wide). I'm trying to analyze it to determine that largest load that can be placed (anywhere) on the floor during some construction/restoration work and I'm having some trouble getting...
  13. DMWWEngr

    Duracell Life...Very basic question

    Sorry for the basic question but I think this should be an easy for you guys to answer. If you have 3V supplied by two "typical" Duracell (or any other brand) batteries. Is there a way to determine the approximate life of the batteries if the AMPERAGE draw is known?? i.e. Say you...
  14. DMWWEngr

    Vapor barrier under exterior slab-on-grade??

    I'm in the process of putting together plans for a small boat ramp. From what I can tell from a state DNR fax, they recommend placing TWO layers of 4-mil vapor barrier underneath the concrete ramp. I understand the purpose for a vapor barrier inside a stucture but what is the purpose of this...
  15. DMWWEngr

    Current in one direction only...diode??

    I'm working on "designing" a circuit for my car. I want to splice a wire in to an existing circuit to make the lights flash when I want them too. Imagine you have wires heading to your lights (in a car), I want to splice a wire in so that I can turn the lights on with the flip of a...
  16. DMWWEngr

    Trussed Bars??

    I was looking through an existing buildings plans to familiarize myself with the design. It is an 8" thick flat slab with drop panels at the columns. When looking at the reinforcing for the slab it calls out the number of bars, the size of the bars, and designates top or bottom. Below...
  17. DMWWEngr

    Slab-on-Grade and Grade Beam Design

    I'm trying to find some "good" procedures that can be used to design a slab-on-grade and a grade beam. (Note: By grade beams I'm talking about a foundation system that is used to support walls above...similar to a wall/strip footing) If there is a section in the ACI 318/99 code...

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