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thanx Rana it is confirmed that shear strength decreases with increase in depth of beams what about the slabs and footings?as in footing we control punching shear by increasing the depth also in flat slabs same procedure is adopted.

yeah it is true for deep beams the shear strength decreases with increase in size. Its called sizing effects. Its been proven from concrete research. Deep beams provisions shear is different from normal beams. there are many factors involved for example the increase in sizes of concrete members and compressive strength the ductility is reduced. but for normal deep beams the code quation with factor 2 holds good unless you are doing research or desiging a critical member having high shear force. http://www.ias.ac.in/sadhana/Pdf2012Feb/89.pdf

i think the large continous sway was because of the resonance...although it the ductility of the steel was remarkable