SEISMIC ASSESSMENT OF OIL RESERVOIR USING NUMERICAL FEM AND ANALYTICAL FORMULATION OF DESIGN STANDARDS

The importance of earthquake effects on storage reservoir forces researchers to investigate the seismic response of tanks. Despite recent advances in design standards, there is no acceptable method for time-history analysis for such structures, with high structural stiffness. However, seismic codes such as Standard No. 2800 and ASCE/SEI 7 for conventional structures minimize only difference between the selected response spectrums and the design spectrum in the preset period range. Seismic codes have differences in their scaling methods. Thus, these differences in the scaling method have a significant effect on the seismic response of the reservoirs. This paper studies the seismic response of a number of tanks in an existing steel oil storage complex. The base shear and overturning moment values are calculated based on the criteria of the design standards called Code 038 and API 650 and compared with FEM values by ANSYS software. Also, the dynamic hoop stresses obtained from design standards are compared. The obtained results show that in some cases there are weaknesses in design standards and seismic regulations, which require further research in the future

Keywords:

Steel reservoir , Time-history analysis , FEM , Seismic assessment , Design code