I have a wall with a property line so close to the face of the wall that it isn't funny. is there any reason I cannot use a retaining wall without a toe if I can meet all of the soil pressure and stability requirements? I cannot think of one...but then...
thanks.
someday I am going to ask a "smart" question instead of a dumb one, I swear... Why would you NOT want to tie a pier to a foundation? (moderate to highly plastic soils). I guess you can resist uplift of the building frame with the slab and grade beams, but if you do have soil movement...
I have some detention structure walls. they are not particularly tall less than say 7 feet to the base. They are retaining filled earth over fat and lean clays, over moderate to highly weathered limestone. the general management of the soils for the building is to remove and replace some or all...
As far as i can tell the IBC 2000 references only aci 318 with no revision listed. therefore are we supposed to design to whatever the latest released edition of aci 318 is that we can find? I would normally expect there to be an adoption process, if i were in a big city, but that will not be...
ok, once again I am confronted with someone "just wanting a foundation design". I have a "soil sample" test result with LL 5, PL 19, thus P.I. of 26 and 82.8 passing the 200 seive. I know we have expansive soils here. I have read the code and based on IBC cannot determine...
I got tossed a set of drawings purporting to show a detention pond with concrete walls on all four sides and a rectangular wier at the low end. the pond itself has a natural soil bed. the single structural wall section showed a dimension of 2'-6" with about 13 horizontal rebars in it. and...
I have no idea how I wind up in these situations but...I have been asked to review a temporary bracing and erection proceedure plan for a steel framed building. I am not the SER, and I am not working directly with the erector. my contact is the general. I have been beating the bushes trying to...
I have been asked to consider analyzing structural trusses (used mostly for farm and ranch structures, not for human habitation, to the best of my knowledge at this time) and providing a letter of certification and stamped calculations for the trusses and columns. I would not have a problem with...
I have read the sentence several times and believe I understand it but...Section 7.c.5 asd, green book, specification for structural joints using astm A325... What EXACTLY is meant by an outer ply? Instinctively I think know, but it is going to cost someone money if my instint is wrong. Reason...
I am finalizing a report dealing with changes to a structure that was designed under the 1988 UBC code. the issue is wind loads. I have the 91 UBC, but cannot find my 88, if I have one. I checked the 91, and there are those nice gray lines next to all of the tables for wind design telling me...
NDS spec for wood construction, 2001. Section 3.3.3: 3.3.3.1, 3.3.3.2, 3.3.3.3 all give conditions where the factor CsubL can be considered to be 1.0, but if I look at section 4.4.1 it gives me some other conditions, which if satified give CsubL = 1.0. the question is if I look at 4.4.1.2 para...
Ok, here goes. I am designing a great many sloped members for a complex roof with all kinds of slopes and some fairly heavy loads - different ones of course. I know how to use flat or sloped beam methods for moment and shear and what is conservative and what is not (Breyer). Any tips on...
OK, we got rid of the thirteen foot conical cantilever over the garage with the slate roof that took the two steel beams weighing 3800 pounds apiece (I may be exaggerating slightly, but not much) due to expense. I have managed to find criteria for trusses stating that the maximum cantilever...
I am not sure anyone will have a rule of thumb, but i would take one. My favorite contractor thinks i might have an idea what the average cost per square foot would be for precast concrete parking structures(one story). He said it is 55,000SF, with a 116' ramp x 25 feet wide. Average use, to be...
I am working for a small company that does mechanical (product) development and design, and civil engineering(roads, subdivisions, drainage). I am the new (only)structural. I have risa 3d which I bought for myself. I would like Risa floor. The owners are a bit reluctant, understandably, to...
I am working on a residential structure that is not much like a residential structure. The Owner wants to use ICF for this part of it. I have researched ICF and given the hype and lack of hard info, I will design it as though it were regular concrete, since it is thirty feet tall. The tower is...
I am working on a project which is made up of a number of curves of varying radii. There are several porches or verandas with semi circular plans. All of them have conical roofs supported at 1/4 points (+/-) on columns. In elevation they are each a series of stone arches, with the keystones...
