when we find the natural frequency for any catenary structures (steel catenary riser) by considering it as the tensioned beam, do we get the correct natural frequency?

while going through one of the research papers, 

i am getting difference in the natural frequency, the paper has considered the catenary structure as tensioned beam where as i am considering the catenary as it is.

also the program used by the paper(mentioned above) is different.

please help me in identifying this problem

thank you

Similar questions and discussions