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  1. morganjoe

    Force of Impact

    Can somebody tell me how to find the load you would use to check a timber member if it is hit by a falling object. I have an idea of how much the object will weigh. I also know the distance it will fall, so therefore, I know the velocity at the point of impact. To keep me from digging through...
  2. morganjoe

    tremie seal concrete slab design

    Thanks for all the input. My calcs come out like yours PEinc. I always calc it like that. I wanted to make sure I was not missing something. The contractor always seems to be surprised at how thick the tremie seal slab needs to be, and I alway get the response of some other job they did with...
  3. morganjoe

    tremie seal concrete slab design

    Thank you for your responses, and I agree with you, but I have run across numerous designs that don't seem to use this design procedure. Example: Pit is 17'x25' Water table at a depth of 8'. Top of tremie seal slab at a depth of 27'. They come up with a 7' foot thick tremie seal slab. How...
  4. morganjoe

    tremie seal concrete slab design

    My question has to do with sheet pile cofferdams that are constructed in areas of high water table. Dewatering of the site is not allowed, so a tremie seal concrete slab will be placed at the bottom of the excavation. When designing the tremie seal slab, does the weight of the slab need to...
  5. morganjoe

    Thicker Flange Steel Beam

    A steel beam that has a steel plate welded to one of the flanges would have two different Sx. If used as a simply supported beam, would you put the thickened flange on the top (comp) or the bottom (tension). Does one of those orientations allow you to use the larger section modulus when...
  6. morganjoe

    sand jack

    Does anyone know how to calculate the allowable load on a sand jack, or sometimes called a sand trap, for falsework design?
  7. morganjoe

    Joists span for falsework

    My falsework question is for the design span length for 4x4 joists. The plywood will sit on top of these joists, and these joists will be setting on top of steel beam stringers (HP14x89). The flat slab bridge is fairly thick, and the stringers are fairly close together, so the joists are...
  8. morganjoe

    sand jack

    Does anyone know where I can find information about the load capacity for a sand jacks. They will be used in a falsework design. They will be constructed with a plywood bottom and 2x4 or 2x6 perimeter with (1)3/4 lumber banding or (2) 3/4" lumber banding respectfully. They will be filled with...
  9. morganjoe

    unreinforced concrete slab

    The slab is not a so-called "mud slab" or "rat slab", it will be in place to resist hydrostatic uplift forces. I looked into fiber mesh, but this is for the durability of the concrete and not intended to replace structural reiforcement.
  10. morganjoe

    unreinforced concrete slab

    I have designed numerous tremie seal slabs for cofferdams and they have always been unreinforced and the weight of the slab alone resisted the uplift. This typically results in very thick slabs. This particular cofferdam will be designed with a reinforced tremie seal slab that will be braced...
  11. morganjoe

    built up section - sction modulus

    I have a situation where I am checking the strength of a built up steel section composed of a plate tension flange, a plate compression flange and a square tube steel. The compression flange length is limited so the tension flange is always longer. This causes the centroid to be shifted toward...
  12. morganjoe

    unreinforced concrete slab

    UcfSE, I have a thick bottom slab to a cofferdam in which there will be uplift forces. I can brace the end of the slab on opposing sides so I will end up with a one-way slab with a bending moment. I have seen it designed where a very thick slab is used and they checked the bending stress verse...
  13. morganjoe

    unreinforced concrete slab

    Can anyone tell me the procedures, assumptons, and formulas to use when checking a thick unreiforced concrete slab. I am thinking that if the slab is thick enough you just need to check the shear values because the tension steel will not develope. Is there a ratio of length to depth, or other...

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