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Calculation of free vibration of a cantilever beam in SAP 2000

Calculation of free vibration of a cantilever beam in SAP 2000

Calculation of free vibration of a cantilever beam in SAP 2000

(OP)
A cantilever beam length 2m,cross section 60mmX40mm , material density 2800kg/m3. E= 78GPa. when im calculating analytically its free vibration due to its own weight , I am getting 8.52 Hz . But In SAP 2000 is giving me 594.18 Hz.... where is my mistake????????? please help me...

RE: Calculation of free vibration of a cantilever beam in SAP 2000

(OP)
i am getting correct result when i used shell element... but results were coming different when i used frame section rectangular of same cross section and of same material.... why is this so???????

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