ASCE 113 base plate design substations
ASCE 113 base plate design substations
(OP)
I have a question regarding the formulas given in ASCE 113 regarding determining the thickness required for a base plate. Here is the link to ASCE 113 showing the the base plate formula: http://files.engineering.com/getfile.aspx?folder=3... . I am working on a spread sheet to design base plates. I am trying to verify that I have calculated the C value correctly. I am confident with the BL value. Here is a sketch of the base plate http://files.engineering.com/getfile.aspx?folder=5... . A weep hole will be added to the base plate but it is not shown. Any comments/ suggestions are appreciated.






RE: ASCE 113 base plate design substations
Bolt Load = (P / total area + Mx*y/Ix + My*x/Iy)*Bolt Area
I don't see a C in that formula... The distance from the reference axis would be the distance from the centroid of the section.
RE: ASCE 113 base plate design substations
RE: ASCE 113 base plate design substations
RE: ASCE 113 base plate design substations
RE: ASCE 113 base plate design substations
By inspection, a longer bolt moment arm C will generate a larger plate stress, so you're looking for the longest bolt arm for that given orientation of bend arm. Of course, the plate can't bend through the HSS section, so as mike says, the worst case bend line location is at the face of the column.
(For a square column and 4 bolt base plate as shown, you'll need to check bend lines in one or both orthogonal directions, plus a diagonal bend line across the corner)