TY - JOUR ID - 72394 TI - Dynamic Response of Submerged Vertical Cylinder with Lumped Mass under Seismic Excitation JO - International Journal of Engineering JA - IJE LA - en SN - 1025-2495 AU - Shahmardani, Mahdieh AU - Mirzapour, Jamil AU - tariverdilo, saeed AD - Civil and Environmental Engineering, Urmia University AD - Structural Engineering, Politecnico Di Milano AD - Civil Eng., Urmia Univ. Y1 - 2014 PY - 2014 VL - 27 IS - 10 SP - 1547 EP - 1556 KW - vertical circular cylinder KW - Seismic Excitation KW - lumped mass KW - Added mass DO - N2 - An analytical approach is presented to assess the response of offshore structures under seismic excitation. This paper evaluates the impacts of different fluid field models and the mass of equipment at the top of offshore structure which is simulated as lumped mass on the responses of offshore structures. To do this, two and three dimensional fluid field models are developed. In three dimensional models different approximation regarding the free surface boundary condition associated with high and low frequency excitations are adopted. Then the alternation of response of structure with changing in the value of lumped mass is calculated. Finally the impacts of different models on the value of maximum displacement for Kobe earthquake are evaluated. It is shown that different approximations regarding the fluid field could largely change the value of maximum displacement evaluated by the models.  UR - https://www.ije.ir/article_72394.html L1 - https://www.ije.ir/article_72394_7764d0f7355b7eb7ea37d1564fc73d54.pdf ER -