PROBLEM ON NATURAL FREQUENCY OF A STEEL FRAME ON SAP 2000
PROBLEM ON NATURAL FREQUENCY OF A STEEL FRAME ON SAP 2000
(OP)
Problem : continuous frame with shell element . heigh and wide 4000 mm , bases of coloumn 400 mm . shell thickness 5 mm. original weight 180 Kgf. density 8036.56 kg / m3 . steel elemnt. E = 200 GPa.
according to a literature its 7th , 8th and 9th mode natural frequency is 4.14 Hz , 4.64 Hz, 6.69 Hz.
But when I am doing its , I am getting 7th mode result same ..but nt getting same result on 8th mode and 9 th mode.
please help me out ....
here I am giving my analysis .... 9 th mode - 7.47 Hz
8 th mode - 5.04 Hz
according to a literature its 7th , 8th and 9th mode natural frequency is 4.14 Hz , 4.64 Hz, 6.69 Hz.
But when I am doing its , I am getting 7th mode result same ..but nt getting same result on 8th mode and 9 th mode.
please help me out ....
here I am giving my analysis .... 9 th mode - 7.47 Hz
8 th mode - 5.04 Hz





RE: PROBLEM ON NATURAL FREQUENCY OF A STEEL FRAME ON SAP 2000
RE: PROBLEM ON NATURAL FREQUENCY OF A STEEL FRAME ON SAP 2000
RE: PROBLEM ON NATURAL FREQUENCY OF A STEEL FRAME ON SAP 2000
RE: PROBLEM ON NATURAL FREQUENCY OF A STEEL FRAME ON SAP 2000
And one problem ...I have modelled a cantilever beam with shell element , beam is 2 m long , 60 mm wide and 40 mm deep... here i am getting correct result compare to my analytical result.. but when i modelled using frame element with same material type i am getting different result... why is this so... You please help me i am facing problem very badly... density is 2800kg/m3 . E= 78 GPa . poison's ratio 0.3 .