I am working on a project that is going to have 4 floors of wood and a wood roof on top of a level of precast. I have just started to lay out the shear wall plan. My initial thought is to treat the diaphragm as rigid and push all of the shear into the center corridor walls and partition walls...
Does anyone here have any experience calculating the force of rotor wash from a helicopter on to the side of a building that is adjacent to a landing pad? I would think I should be able to calculate the vertical force by taking the weight of the helicopter times an acceleration factor and...
I am looking for some fresh ideas on how to approach this design.
I have a wall that spans from top of footing in the basement to the roof deck at wood truss bearing. Currently there is a hinge point at grade elevation 18’ from the top of footing since there will be no floor diaphragm in this...
I am designing a portal frame with tube steel columns that has a fixed base. Right now I have the base connection detailed with a 12”x12”x.75” base plate with 3/8” gussets going up 6” on the tube column and welded to the base plate and four anchor bolts. The numbers show that this should work I...
I am working on a desing for a gravel parking lot, something I have not done a lot of. I have three questions.
1. What is a good minimum grade to use? I am curently using 1.5%
2. is there anything i need to do to the catch basins to protect them from sediment runoff?
3. Should I be specifing...
I am looking at using a 12" diameter corten A606 steel (weathering steel) tube that will be filled with concrete for some supports on a pier located in a small city pond. The Corten steel shell is only for architectural reasons, I do not need any bond between the two materials. Being that the...
I am just wondering how many of you out there allow contractors to wet stick foundation dowels. I generally allow typical foundation wall dowels to be pushed into place but always require retaining walls to have all rebar tied in place. I have run into a situation where the contractor placed...
I am working under the 2002 masonry code using allowable stress method. I am looking for limitations on height to thickness ratios for hollow concrete masonry with load bearing walls. I have always designed cmu walls with an h/t> 30 as slender walls. h being the height of unbraced wall and t is...
I have a project that has a 20 foot tall cast in place concrete foundation wall That will be back filled full height with sand. The wall is 14" thick, I am using 30 pcf for my active pressure on the wall. I want to design the wall as pin-pin. the top will be pinned by the main floor diaphragm...
A project is under constuction now where I orginally detailed all under slab plumbing pipes to be sleeved into either the foundation wall or the wall footing, depending on the I.E. of the pipe. now that all of the footings are poured it turns out that many of the pipes will now pass under the...
One of my contractors wants to drive a compact excavator on the second and third floor of a building to help him with some of the rnovations. The unit weighs 3500lbs and rides on a set of rubber tracks that are about 4' long and 10" wide each. The floor construction is 3" formed conc. floor that...
