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  1. wds1

    ceco trusses

    Does anyone have any load tables on CECO trusses? CECO makes concrete forms and Pre-engineered buildings. CECO = Concrete Engineered Company. It used to make trusses with cold formed top and bottom chords in the 1960 and 70's. That portion of the company is out of business.
  2. wds1

    1 day shoring to meet OSHA.

    It often seems like bracing a trench can cost more time and money than what you are putting in the trench. I do not need a rigid structure, like alot of the long term solutions show. The structure can bend, but it cannot break or overturn. 1) The trouble with jacks, is they get in the way of...
  3. wds1

    1 day shoring to meet OSHA.

    I have a situation where we need to dig a 15' Deep trench for a 10' dia. x 60' long water tank. The trench only needs to be open for about 1 day. OSHA requires us to shore the trench or layer it back. Is there an easy and cost effective solution shoring the trench. The solution can bend, but...
  4. wds1

    critical storm detention method

    ...storms. In the Critical Storm Detention method you determin the %increase for 1-yr volume(V1) between Post and Predevelopment(post V1/Pre V1-1.0)*100, and using the table below you determine the critical storm: 0-10% increase 1 yr critical stm. 10-50% 5 yr 50-100% 10 yr...
  5. wds1

    ASHRAE 90.1 requiring min R-20 for roofs?

    Is ASHRAE requiring a R-20(min. 3.3" polyiso) for roofs.? When will it be effective in the codes?
  6. wds1

    Mile High Tower - Yikes!

    Usually the bankers limit the height of the buildings. Not so in the oil rich arab countries. The women in the right margin we pretty nice.
  7. wds1

    Horiz. Masonry Jt. Reinf. below grade?

    There is some confusion at our office of whether Horiz. Mas. Jt. Reinf. should be put in the masonry foundation wall below grade. According to NCMA Tech. Support, horizontal mas. joint reinforcing is Not required by code. I would like to get a consensus of whether other engineers require it...
  8. wds1

    Inflection Point Lateral Bracing

    For lapped Z's over supports, AISI uses the distance from the end of lap to the I.P. as the unbraced length of the bottom flange.
  9. wds1

    Eliminating an intermediate crane x-braced bay

    I have been called by the owner to eliminate some intermediate x-bracing that is interferring with machinery operations. The building has 12 bays @ 25'in the direction of the runway beams. The runway beams are x-braced longitudinally in the 1st, 8th, and 12th bays for (2)10 ton cranes on the...
  10. wds1

    Shoring 17'Lx14'Wx17'D excav. in sand, inside building, No sheet pile.

    We have a project to install a pit inside an existing building. The soil is loose sand and gravel. The clear height inside building is 18'. It's possible the soil may be very wet. Due to the limited clear height, it would be difficult to drive sheet piles or I-bms. Any recommendations.
  11. wds1

    Firewall structural loads

    What structural loads are others using on there firewalls? How are others designing their firewalls? The firewalls must maintain structural stability when the building on the other side of the wall collapes. There seems to be 3 methods: 1)Free standing wall cantilevered from the floor(neither...
  12. wds1

    What is considered lateral bracing for a wood stud.

    ...load while an Unbraced can only carry 0.5k. Assume we have a typ. 28' wide house with roof trusses. An unbraced stud can only carry 0.5k/(1.33'*14')=.027ksf. 1.33' is the stud spacing and 14' is 1/2 the roof span. That will NOT even carry the roof load, not to mention the 2nd floor and...
  13. wds1

    What is considered lateral bracing for a wood stud.

    I have a 2x6 stud, 10.5' high. When I run the numbers, it can take 5.56k when braced in the weak direction and 0.49k when NOT braced in the weak direction. Can drywall provide the necessary lateral support? If Not, how do they build 2 story houses with walls made of 1/2"dry wall, 2x4 studs...
  14. wds1

    #4 stone in exterior concrete slab on grade.

    I have 2 concrete suppliers. One has No problem using #4 stone and the other is Not comfortable using #4 stone in exterior slabs. Does anyone know if there is any problem with using #4 stone in exterior slabs.
  15. wds1

    No. 4 stone in exterior conc. slab

    Can you use #4 stone in exterior conc. slab on grade. I have one supplier who says it is No problem and another who says you cannot use #4 stone outside. He says #4 has more deterious material, because it is not crushed as much. He says ACI does Not reccommend it outside, but could not quote...
  16. wds1

    Hand Calculations

    The trouble with hand calculations is that it is hard to apply all the load combinations and draw the max/min envelope. The way the codes are going, they are forcing us to use software. The trouble with software is that you have to hand check all your output which can be more time-consuming.
  17. wds1

    Support of wwf in slab on grade

    The Wire Reinf. Instite states that WWF shall be supported. In Reality, it seldom is supported. WWF requires alot more supports because it is more flexible. One of the main reason of Not supporting the WWF is that you can run the concrete truck over the subgrade and place the concrete where...
  18. wds1

    Concrete mix designs

    I'm posting concrete mixes on this page because we do Not have a Concrete page. Please review the following mixes and comment. No. PSI Cement Sand #4 #57 #8 water air W.R. (-) psi lb/cy lb/cy lb/cy lb/cy lb/cy gal oz/cwt oz/cwt 1 3000 470 1235 575 1085 300 35...
  19. wds1

    Concrete spec. for Slab-on-grade

    How do most people specify concrete floor slab-on-grade. Give ACI a little time and they will reverse their decisions. Concrete has too many variables. If you spec a highier strength mix, you get more cracking because of curling. Some want vapor barriers between concrete and granular...
  20. wds1

    inadequate EIT training

    I can relate to what your saying. I am the only design engineer at a design-build firm. I have to do all the structural and civil calculations. I have to know the building codes and I have to manage the projects. With the codes changing every 3 years it's impossible for one person to keep up...

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