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Hi, For a single angle in tension with bolted connection in horiZontal leg, you have yielding tensile strength controlling. How would you explain to select rz over other radii of gyration while calculating slenderness ratio. Is there a way to remember which radius of gyration to select among...

Hi, Have a 60x40 building with roof trusses bearing on perimeter beams. Beams are provided all around the building for truss bearing and lateral support. Can the infill cold-form studs between HSS columns supporting beams be considered ample for the lateral support of the structure or shall I...

Hi: I am designing a mat slab which will support mechanical equipment such that the differential settlement between the edges of the 115ft x 15 ft may cannot be more than 0.002 in. Have gone upto 48" concrete mat, still getting differential settlement. Thought someone may have experience in how...

For a slab model using plates, to check the one way shear capacity of the slab near the column. Program gives you Qx and Qy both with signs positive. Since its one-way check you won't sum up the two values to compare with (Phi)Vc for concrete? Thanks

Hi, Can a key and groove joint in a slab be treated as expansion joint such that the bars (both top and bottom) extending into second pour are terminated in second pour and greased viz. they can slide during expansion and contraction. Do we have a code recommendation for such a system. Thanks

Hi, I am looking for reference book which explains the design of circular concrete slab supported on columns. Somehow I am having difficulty finding a reference with good design example using ACI 318. I have max moment (both positive and negative) for applied loads on the slab. My...

Am i correct to assume that max / min moments values for a meshed slab (mesh comprise of different sized plates) in Plate Forces Spreadsheet will be used for reinforcement design. Since these forces are in per-ft and I am assuming my design strip to be 1 ft anyways, I dont see a reason to...

Somehow I cannot find the code provision which requires that rebar in earth retention structure cannot touch the building foundation. There is some type of minimum spacing between tension rods and concrete footing. Help much appreciated.

I have this 48 ft diameter circular slab 24" thick. Slab will support liquid retained tank and sit concrete columns. I ran my analysis and have plate moments and plate shear values. I have modeled this slab as plates. However, if I want to verify whether concrete beams are required, which ACI...

Are we correct to neglect the uplift on concrete piers due to steel column in frames building. Also, am I correct to design pier as stand alone pedestal for reinforcement purposes?

I am analyzing a circular slab in RISA 3D. Plates are of different sizes. Am I right to say that my reinforcement will be designed for max moment / ft from the results. How will I apply the results of Qx and Qy from the output to design for shear. Say my Qx and Qy are -100 kips and -103 kips...

Ok this is simple one. Tank is 75 ft Dian. With 50 ft height. Shell dead load of outer wall is 610 lb/ft. How will I model the load on the slab in RISA given that I have 12 equally spaced anchors connecting the base of the tank to the slab? Thanks,

Hi, I am looking for a design aide which outlines stepwise procedure for designing elevated slab platform to support circular liquid tanks of heights 60ft and diameter 38 ft. Thanks,

So I am modeling mat slab in RISA 3D for a 130ftx100 ft slab. Individual plate dimensions within model are 6.5ftx4.5 ft each. Longitudinal axis is x-axis and shorter dimension is along z-axis. Compression springs are used under the mat to account for soil properties. Running analysis gives me an...

I am designing 12" CMU load bearing wall in a box building to resist 25psf wind load. Have designed at most 20 ft highs in the past so looking for design help. Any design experience will be appreciated. Building is 95ftx95ft. Thanks,

I am searching for information on how to design an upstream approach embankment for a spillway. Items I am trying to design are Height and Length of Embankement from the center line of dam/spillway (Site is a local lake). Selection/thickness of Rip Rap material. Help will be highly...

Design most efficient W10 Section for following loads. P(r)=100 Kips M(rx) = 50 kip ft K L(x)= 21.6 ft. KL(y) = 8.13 ft. Trying to guess-timate a section to begin calcs We know that p= 1.67/P(n) And b(x) = (8*1.67)/(9*M(nx) However having difficult time manipulating values to enter the...

I am trying to design a galvanized steel platform on which trash bin will be driven. I am planning of designing this with WF sections and or channel sections. Steel grating will be supported on the beams forming up the platform structure. LL = 100psf / DL (grating) = 10 psf. Help regarding how...