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addendum to above you can then move the test section around in autocad and repeat the massprop command to see how the geometrical properties alter. The values of second moment of area will not alter. Moment of inertia will alter if u then put the centroid of section on the global coordinates...

The simplest way is to draw a rectangle of known breadth and depth say 100mm x 300mm. The second moment of area is bd^3/12, which equals 225000000mm^4. Then use massprops to determine which value of the geometrical properties equates to the second mom of area. Then you can draw any complicated...

All There seems to be a lot of misunderstandings regarding my original query. Either that or a lot of misunderstanding of finite elements. My query had nothing to do with design codes. FE is purely an analysis tool. It does not matter whether the model is concrete, brickwork, steelwork or a...

Sorry ludvik but i would refer you to arnie_c statement (which i agree with) that the values of Ixx/Iyy do not appear in the formulation of FE equations. Consequently if they do not appear in the equation; how does one model the different values of Ixx /Iyy. If you cannot model these values...

Thanks for the reply arnie_c. I was beginning to think the question had beaten the experts in this forum. I agree; the values of Ixx and Iyy do not appear in the formulation of the FE equations. However using elements with orthotropic material capabilities does not solve the problem. For a...

Does anyone know how to model both the longitudinal and perpendicular values of "2nd moment of area" in a finite element program. I am familiar with the LEAP5 finite element suite (and i assume others are similar) but there does not appear to be a facility to input both Ixx and Iyy.

my references agree with Taro However I would be interested if anyone knows how this equates to E/16 stated in B.S. 5268 (Part 2 clause 2.7) Alan

depends upon the type of steel used for fabricating the anchor bolts. If the steel has alloying elements present (High strength steel usually has) then you have a problem. If the anchor rods are mild steel then you will probably be ok.