I am designing a masonry building in SDC D utilizing special reinforced shear walls. My shear walls are relativly long (50' in some instances)and I've run calcs and find that I dont even need horizontal grouting/rebar for shear because i am so long; however ASCE/MSJC minimums are grouted...
See attached pdf. I have a retaining wall that, contrary to normal, is not resisting external soil pressure, but internal soil pressure from backfill that pushes outward. In my worst spot I have 87" of unbalanced load pushing outward. My concern is that while I have a slab present at the top...
I have a tall basement retaining wall (18ft) that I wish to design as a horizontal one way slab system (not a typical vertical one way slab/beam)because my horizontal dimension is much less than my vertical dimension. I have perpindicular walls at the ends of the subject wall that can restrain...
I have a structure with a below grade basement all supported on spread footings. Due to soil expansion we wish to underpin the structure with helical anchors and hydrovac soils from below the footer and install void form below the footer. We are esentially turning a reinforced concrete...
Is there a popular strengths of materials (mechanics of materials) book out there? Mostly I need some good refreshers on principal stresses, mohrs circle, ect..
My undergrad book SUCKED and I need to brush up..
Thanks,
Hi guys.
I have mostly designed with wood and have found Breyer's "Design of Wood Structures" book to be the most complete design resource. I am now getting into concrete, masonry and steel. I wonder if there are similar books to Breyer's wood book for concrete, masonry and steel which teach...
So I came upon a structural planset from an engineer that was stamped for a 135mph exp B wind speed. The planset was an internet plan set which clearly said something like "lateral force resisting system designed by others". There was nothing in the planset addressing design for this wind...
I have talked to multiple firms/friend in my area that have either gone out of buisness or are about to go out of buisness due to this economy. My buisness has taken a HARD hit as well. its down to just me now. This all begs the question: Once its down to just you how long do you hang on before...
I design in high wind region and platform framed gable ends are a big no-no unless you have the proper gable end bracing detail, we typically spec baloon framed gable ends.
I have a situation where the roof is stick built and the gable end is platform framed but there are ceiling joists (at...
I have a client who would like to miter the end of a glulam beam at a 45degree angle. They have 2 glulams coming together at the same elevation and the same bearing point and they want to avoid a hanger, so both beams would be mitered to fit together. Even with the miter I have my proper...
I have a situation where there is an existing wood beam which is undersized, it fails due to bending moment, shear is ok. I have sized new members and specified a bolting pattern for the new members to attach to the old members as the old ones need to be left in place. There is no easy way to...
Everything I have found regarding steel flitch plate design suggests that the plate must be sandwiched between wood members to prevent buckling. I have a situation where the builder wants to bolt the plate to an existing beam and we don't have the width to add another wood member, thus the...
I searched and saw a question like this has been asked before but I'm still a tad confused, so here it goes:
I have a rather large 2 story stick built home. I need some interior upper level shear walls (trusses parallel to these shear walls) to transfer roof Diaphragm loads. So I have 2 upper...
I have been requested to perform a shotcrete ispection on a thin shell concrete dome struture. The design engineer specified a 4000psi mix and shotcrete thicknesses. I was going to get a batchplant report on the mix and be on site and measure actual applied thicknesses. Is there anything else...
I have been requested to perform a shotcrete ispection on a thin shell concrete dome struture. The design engineer specified a 4000psi mix and shotcrete thicknesses. I was going to get a batchplant report on the mix and be on site and measure actual applied thicknesses. Is there anything else...
I have a project that was built in 1973, they want to add another roof system on top of the existing roof (all wood framing). The beams can not support the new weight using modern calcs and wood values. Do you guys know where I can find values for these older growth wood species? Is 1973 even...
I have a client who has a steel beam he has had laying around for awhile that he wants to use in a project. Is there anyway to determine if its 30 or 50ksi steel? I couldn't find any stamping on it. Somebody told me that not to long ago everything was grade 30, is this true? I have always...
Hi guys,
I have a situation where the contractor needs a beam sized and only has so much headroom to work with. I've sized the beam that fits and it is more than adequate in shear, moment, bearing length, ect.. but the beam is slightly over on deflection (0.55" allowable and 0.61" actual) The...
I have looked at some former discussions on blocking at truss heels and couldn't find an answer to my question. I am having a disagreement with a building inspector over this and wanted to run it by you guys. I have specified blocking between the truss heels over my shear walls to transfer the...
Hey guys,
I'm wondering if you guys have seen the APA publication for "using wood structural panels for combined uplift and shear resistance". Basically they are using properly placed and nailed OSB in lieu of shear wall holddowns. It seems logical, I'm sure its been tested, but still I...
