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Check deflected shape, there should be step numbers under W. These step numbers are different directions of wind under W load case.

How to have a solid grip on the detailing of RCC structural elements? is there any course on detailing or any good book???

You don't need a reference book for this. Do a simple thought experiment. When bolts are inside the flange, there is no rotational constraint. However, when bolts are outside the flange, load path is throught base plate bending and considering a reasonably thick baseplate(which is 99% of the times) bolts would create a couple offering rotational restraint. You need to ensure that your bolts can handle interaction of shear and tension. This is standard parctise. Thanks.

There is no need for any reference for that statement. Its simple. Flanges will resist moment and and when there are no bolts around flanges, there will be no couple (tension, compression) to resist the moment. Only axial load will be resisted by bolts near the web.

Yeah! its actually not the envelope. But in ETABS 2013 EQ and WIND has just one load case. That single load case includes every thing. For example EQ in ETABS 2013 contains all 6 directions and W in ETABS 2013 contains all 12 loadings. This is much rational approach they adopted in 2013 ETABS. So you dont have to make now hundreds of load combinations.

Aoa. Sir Umar! What is the difference between the two approaches? Can you refer to some good book or article having relevant examples, dealing with the LRFD approach for foundation design? Thanks in advance.

yes sir you are right and got your point .thank you so much

A lot is going on this thread, and I would just point out 1 thing regarding "hinge type base plate". Your base connections can be fixed or pin. Depends where you place your bolts around column. If bolts are insider flanges, its pin, if outside, fixed or moment. You will have to design the baseplate accordingly. Also the connection of column to baseplate matters and you can achieve a pinned connection by welding in a special way but to keep things simple, assuming fully welded column to baseplate, stick to bolt layout to determine if its pin or fixed. Rest, you can transfer the loads like you said. Follow free body. Thanks.