Experimental added-mass in modal vibration of cylindrical structures

In this article, wave endurance time (WET) is addressed as an applicable method for performance-based assessment of fixed offshore structures under extreme waves. In this method, inspired by the endurance time method in the field of earthquake engineering, artificial wave records called wave functions are designed so that their excitations gradually increase with time. Therefore, the main advantage of the proposed method is that it can assess the structural performance under various wave load conditions through a single time-history analysis. Moreover, the reliability of structures can be evaluated on the basis of the time that the structural response is still acceptable. In this study, generation of these artificial records and their application to assessment finite element model of a fixed offshore structure are described based on the extreme waves of the Persian Gulf. In order to consider the accuracy of this method in estimation of the structural response, finite element method is utilised to compare ...

Performance-based assessment of steel jacket platforms by wave endurance time method

Methodology for wave force monitoring of bottom-mounted cylinder using the measurement of the wave surface elevation around the body surface

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.

https://www.ije.ir/article_72394_7764d0f7355b7eb7ea37d1564fc73d54.pdf

Dynamic response of submerged vertical cylinder with lumped mass under seismic excitation

Dynamics of Ocean Buoys and Athlete Motion for Energy Harvesting by Zach Ballard Department of Mechanical Engineering and Materials Science Duke University Date:

C.C. Tung

Papers

Total wave force on cylinder considering free surface fluctuation

Earthquake response of sea-based storage tanks

A study of response and response spectra of offshore structures to regular waves

On response of structures to random waves