I have an exterior mezzanine that will have an occupied space below. This mezzanine needs to be completely watertight. The problem is that metal deck below the concrete and waterproofing above the concrete traps all the moisture of the slab inside. Has anyone ever had to waterproof an...
Anyone ever had pre-fab wood scissor trusses supported by wood columns or bundled studs? I know the concerns about lateral kick-out of scissor trusses and this concerns me being that they would be supported by columns.
I am looking at an existing building. This is a distribution center and the existing section at the loading dock (image attached) concerns me. The foundation is very small and they are not tying back into the slab to resist the retained soil loads. There is a 4' grade differential between the...
I am designing sound wall foundations. The sound wall manufacturer is showing anchor bolt sizes and configurations, but I am checking for anchorage to the foundations (drilled caissons). One wall particular has very high overturning forces and thus very high tensile forces. They are showing...
I'm designing a +/- 20' tall bridge abutment at a stream crossing that will be founded on an inclined rock. The abutment is a cantilevered wall that will support the bridge beams and also retain 20' of fill. I have scoured the web for design examples or guidelines and am finding nothing to...
I am designing an insulated slab on grade at cooler/freezer rooms on an industrial project. We have rack loads of 20 kips max. I am looking for good design examples taking in consideration the properties of the insulation i.e. subgrade modulus, compressive modulus, flexural modulus. I have...
I'm using a diaphragm of 3" lumber decking oriented at 45 degrees and bearing directly on steel roof joists. Has anyone done this before and how did you connect the decking to the joists? I was thinking I could bold a nailer down to the top chords and nail the deck to this.
Thanks
I am designing an outdoor ampitheatre. All four sides of the ampitheatre are open > 80%. There are two towers on either side of the stage. The roof structure is tied to these towers.
ASCE7-05 doesn't appear to give wind loading for walls of open building structures. Do I neglect any wind...
We have a bridge located inside a county park and will have very low daily traffic. The G.C. just got bids for the bridge and they are higher than expected. We are looking at ways to cut costs. One idea is to remove the approach slabs, which are a big cost item for this small single span...
Has anyone ever shown a column coming down on a wall that is thinner than the column. Concrete columns are 14" thick and wall is 12" thick. I don't like this idea. Has anyone ever done this?
I have a client who wants to hang a 500 lb. ornamental object to veneer. I want to anchor it back to blocking attached to studs. This will create a scheduling problem as the ornamental object is custom and will not be there during the erection of the brick. I am looking for information on...
I am working on a job currently where chlorides have deteriorated a tilt up panel excessively. Cracks have developed along the reinforcing lines both vertically and horizontally and extend to the reinforcing which is located in the center of the 5.75" thick panel. There is also excessive...
I have a detention wall that is 16" thick. Our typical contraction joint detail shows 3/4" chamfer strips on each side with pvc waterstop at joint. All reinforcement is cut 2" clear of each side of joint. I have used this detail with success on numerous walls. The crack occurs within the...
Hello,
I am a structural engineer, but am working to develop plans for a mechanism in order to make a prototype. I am searching for tolerance guidelines and general drawing requirements. I'm also looking for example drawings that show general notes that I will need to provide on my drawings...
For the equation:
contact stress = {(1 / (pi[((1-v1^2)/E1)) + ((1-v2^2)/E2))) ^ 0.5} * {((Fn/b) * (Sum (1/pi)))^0.5}
Where Sum (1/pi) = [(1/p1) - (1/p2)] for concave shapes in contact with convex shapes
Sum (1/pi) approaches 0 as the two radii get closer, however when the two radii equal each...
I am working on a job on a FEMA facility and they are specifically requiring it to be designed to withstand an F-2 Tornado. I have found the wind speeds for an F-2 tornado go up to 157 mph. Has anyone ever had this type of requirement on a job before? I'm not familiar with designing for a...
Does anyone have a source that has loading diagrams and formulas for Shear, Moment, Deflection that I can take to the PE? The 13th edition is limited and of course the practice problems do not give examples where you can use a formula from the 13th edition easily.
I am taking the PE Friday and my co-worker warned me about a problem he had. They asked for the tension in the anchor of a shelf angle to a masonry wall. Does anyone have an example of this type of problem?
Probably an easy one for you guys, but I have a cantilevered abutment wall for a stream crossing. I was wondering what affects the angles of the flared wings of the abutment. The bridge is on a tangent.
