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Offshore and Structural Mechanics

Seismic Performance of Jacket Type Offshore Platforms Through Incremental Dynamic Analysis

[+] Author and Article Information
Behrouz Asgarian

Civil Engineering Faculty, K. N. Toosi University of Technology, Tehran 15875-4416, Iranasgarian@kntu.ac.ir

Azadeh Ajamy

Civil Engineering Faculty, K. N. Toosi University of Technology, Tehran 15875-4416, Iranazadeh_ajamy@yahoo.com

J. Offshore Mech. Arct. Eng 132(3), 031301 (Mar 17, 2010) (14 pages) doi:10.1115/1.4000395 History: Received April 03, 2008; Revised September 01, 2009; Published March 17, 2010; Online March 17, 2010

Fixed offshore platforms in seismic active areas may be subjected to strong ground motions, causing the platform to undergo deformation well into the inelastic range. In this paper, incremental dynamic analysis (IDA) of jacket type offshore platforms subjected to earthquake was performed in order to study the linear and nonlinear dynamic behavior of this type of structures. IDA is a parametric analysis method that has been recently presented to estimate structural performance under seismic loads. By using incremental dynamic analysis of jacket type offshore platforms, the assessment of demand and capacity can be carried out. The method was used to predict nonlinear behavior of three newly designed jacket type offshore platforms subjected to strong ground motions. The engineering demand parameters of the platforms in terms of story drifts and intermediate elevation maximum displacement for different records were compared. This method was used for the performance calculations (immediate occupancy, collapse prevention, and global dynamic instability) needed for performance-based earthquake engineering of the above mentioned platforms. Two different behaviors were observed for the third platform in the X and Y directions. Particular attention has to be paid for the seismic design of this kind of platform. The results of jacket type offshore platforms incremental dynamic analysis shows that the method is a valuable tool for studying dynamic behavior in a nonlinear range of deformation. Because of high uncertainty in the nonlinear behavior of this type of structures, it is recommended to use this method for the assessment and requalification of existing jacket type offshore platforms subjected to earthquake.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

Three dimensional view of sample platform P1

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Figure 3

IDA curve of platform P1 for record No. 14

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Figure 4

IDA curve of platform P1 for record No. 15

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Figure 5

IDA curve of platform P1 for record No. 12

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Figure 8

IDA curve of interstory drift in top framing level for record No. 2

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Figure 9

IDA multirecord curve of maximum displacement in the first floor of platform P1

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Figure 10

IDA multirecord curve of maximum displacement in second floor of platform P1

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Figure 11

IDA multi record curve of maximum displacement in top framing level of platform P1

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Figure 12

The summary of the IDA curves and corresponding limit-state capacities into their 16%, 50%, and 84% fractiles in the top framing level of platform P1

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Figure 13

IDA curve of interstory drift in top framing level for record No. 2

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Figure 14

IDA curves of maximum interstorey drift in different levels subjected to record No. 5

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Figure 15

IDA multirecord curve of maximum displacement in top framing level of platform P2

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Figure 16

IDA curve of platform P3 subjected to record No. 14 in direction X

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Figure 17

IDA curve of platform P3 subjected to record No. 14 in direction Y

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Figure 21

IDA curves of peak interstory drifts for each floor for record No. 6 in direction X

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Figure 22

IDA curves of peak interstory drifts for each floor for record No. 6 in direction Y

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Figure 24

IDA curves of maximum interstorey drift in different levels to subjected record No. 3 in direction Y

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Figure 26

IDA multirecord curve of maximum displacement in third floor of platform P3-Y.

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Figure 27

The summary of the IDA curves and corresponding limit-state capacities into their 16%, 50%, and 84% fractiles in the third floor of platform P3-X

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Figure 28

The summary of the IDA curves and corresponding limit-state capacities into their 16%, 50%, and 84% fractiles in the third floor of platform P3-Y

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Figure 1

Typical jacket type offshore platform

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Figure 6

IDA curves of maximum interstorey drift in different levels

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Figure 7

IDA curves of peak interstory drifts for each floor for record No. 1

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Figure 18

IDA curve of platform P3 subjected to record No. 2 in direction X. Imperial Valley, 1979 record in direction X.

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Figure 19

IDA curves of maximum interstorey drift in different levels to subjected record No. 8 in direction X

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Figure 20

IDA curves of maximum interstorey drift in different levels to subjected record No. 8 in direction Y

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Figure 23

IDA curves of maximum interstorey drift in different levels to subjected record No. 3 in direction X

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Figure 25

IDA multirecord curve of maximum displacement in third floor of platform P3-X

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