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  • Users: MotorCity
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  1. MotorCity

    Complete penetration welds

    I usually don't give much thought to complete penetration welds since they develop the full strength of the base material. However, I am wondering if there are reasons to specify a particular type of CJP weld....double bevel, double V, single V, square end, etc. We usually leave it up to the...
  2. MotorCity

    Are shop drawings really "shop" drawings?

    As technology has advanced and there is now software for everything, I question whether the shop drawings I receive are really "shop" drawings. Said another way, are the drawings I review as an engineer really the drawings that the guys in the shop are hovering over on a table to layout and...
  3. MotorCity

    Residential HVAC unit

    Hello HVAC friends.....structural guy here hoping you can point me in the right direction. The problem is that when the AC unit runs (not sure what size, need to check) very little of the cold air makes it up to the second story. The air that does come out upstairs is cold, but the flow is...
  4. MotorCity

    Parking deck collapse in Detroit

    See below Link
  5. MotorCity

    Rammed aggregate piers

    Is there a method to determine how close you can excavate next to a rammed aggregate pier without affecting its integrity? Are there general rules of thumb, such as don't excavate within XX pier diameters? Seems to me that excavating near a rammed aggregate pier would not be nearly as forgiving...
  6. MotorCity

    Head hunter poaching

    From time to time, I receive unsolicited inquiries from head hunters who try to get me to jump ship. These are people I don't know and have never contacted, yet they seem to have no problem contacting me (and others I am sure) out of the blue about a position they are trying to fill. The issue...
  7. MotorCity

    Soil arching action

    Is there some particular depth of a soil where there is no increase in vertical load at that depth due to the weight of the soil? In other words, is soil able to bridge itself or is there arching action at some given depth? As an extreme example, say I am interested in the soil pressure 300'...
  8. MotorCity

    Hard hat history

    I enjoy watching engineering type programs on TV.....about constructing the tallest building, the longest bridge, the largest ship, or whatever. In watching these various programs, I have noticed that any construction that occurs outside of the USA, all of the construction workers are wearing...
  9. MotorCity

    Staad connection checks

    Can Staad check flange local buckling, web local yielding, web local crippling, web sidesway buckling, web compression buckling, or web panel zone shear per AISC?
  10. MotorCity

    Structural Engineering books

    No, this is not another thread about what books are essential for a SE's library. Rather, it is about an observation I have made recently in our office. Have you ever noticed that we structural folks seem to have the most extensive collection of books and references? Its almost like we collect...
  11. MotorCity

    Payment for services

    Questions for consulting business owners: 1. Do you require any payment up front before starting a project? If so, how much? 2. How long do you allow to receive full payment? Thanks
  12. MotorCity

    Horizontal moving loads

    I have a crane travelling along a two span continuous beam with two moving wheel loads. The wheel loads are primarily vertical, but in some cases there is also a lateral load associated with each wheel (perpendicular to beam). Is it possible to model horizontal moving loads? If so, what is the...
  13. MotorCity

    We have two pendant lights in our b

    We have two pendant lights in our bathroom with a halogen bulb, no dimmer switch, but they are both on the same switch. They have been working fine for the last three years, then one of the bulbs went out. I replaced the bulb, and about three days later we noticed a buzzing sound coming from...
  14. MotorCity

    Tachometer display conflict

    So, having a long commute allows me to spend countless hours in my car, inevitably staring at my dashboard while stuck in traffic. In doing so, I took a rather detailed look at my speedometer and my tachometer and noticed that the they did not seem consistent in the information display to the...
  15. MotorCity

    Live load reduction in one way slab

    I am designing a one way slab with a steel deck spanning over several floor beams in a typical bay (35'x35'). Beams are spaced at 7'. I would like to take advantage of a live load reduction, but I am having difficulty trying to interpret what the tributary area should be for use in the reduction...
  16. MotorCity

    Re-chase anchor bolt threads

    I was asked to inspect existing anchor rods that are 1.5" diameter, cast in place, located outdoors. They anchored a piece of equipment that had been temporarily removed, but would be re-installed after my inspection. Overall, they appeared to be in good condition. Almost all of them showed...
  17. MotorCity

    ASCE rail

    When you have a lateral load on a crane girder, the load path travels from the wheel, to the rail, to the girder, agreed? That being said, I have never seen or heard of anyone checking the lateral capacity of the rail as is commonly done for the crane girder. It seems prudent that one should...
  18. MotorCity

    Auger cast piles

    We are using auger cast piles that are grouted (as opposed to constructed of concrete). They will be reinforced with a cage and a single bar in the middle of the pile. Reinforcement will not extend to the full length of the pile. My question is this, is there anything in ACI that addresses the...
  19. MotorCity

    Bolt designation

    I am working on a project where the design criteria provided states the following: Anchor bolt: strength class 5.6 Nuts: strength class 8 Washers: strength class 100hv I would like to know the strength of each of these and the meaning of each designation. And yes, I did an internet...
  20. MotorCity

    Wood diaphragm interaction of forces

    Obviously shear loads drive the design of a diaphragm, but why is flexure (say due to gravity loads) never considered in the design of a plywood diaphragm? It seems intuitive that there should be some sort of interaction equation for shear and flexure. Maybe something similar to: fa/FA + fb/FB...

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