Analysis of wind load effect on key components in a jack-up offshore platform

2020 ◽  
Vol 101 ◽  
pp. 102263 ◽  
Author(s):  
Guijie Liu ◽  
Yuanfang Sun ◽  
Benlei Zhong ◽  
Yingchun Xie ◽  
Atilla Incecik ◽  
...  
Keyword(s):  
Wind Load ◽  
Offshore Platform ◽  
Load Effect ◽  
Jack Up

scholarly journals A stochastic approach for the wind load effect on steel structures

2016 ◽  
Vol 69 (2) ◽  
pp. 137-145 ◽  
Author(s):  
Thiago Dias dos Santos ◽  
Gustavo Henrique Siqueira ◽  
Luiz Carlos Marcos Vieira Junior
Keyword(s):  
Steel Structures ◽  
Stochastic Approach ◽  
Wind Load ◽  
Load Effect

Determination of Basic Wind Velocity for Wind Load-Governed Limit State

2019 ◽  
Author(s):  
Ji Hyeon Kim ◽  
Hae-Sung Lee
Keyword(s):  
Wind Velocity ◽  
Reliability Index ◽  
General Procedure ◽  
Limit State ◽  
Wind Load ◽  
Wind Pressure ◽  
Load Factor ◽  
Load Effect ◽  
Design Life ◽  
Target Reliability Index

<p>This paper proposes a general procedure for evaluating a nominal value of wind velocity for a wind load- governed limit state to secure a target reliability index during the design life of a structure. The nominal value of wind velocity, referred to as a basic wind velocity, and wind load factor should be determined so that the factored wind load effect secures a target reliability index for a wind load-governed limit state. In this study, the analytical form of the return period of the basic wind velocity is expressed as a function of the target reliability index, wind load factor, and statistical parameters of wind pressure, which are derived as linear functions of the coefficient of wind velocity. The proposed approach is applied to the Korean Highway Bridge Design Code-Cable supported Bridge, which specifies the design life of a structure as 100- and 200-year.</p>

scholarly journals Component Combination Rules of Wind Load Effects of Building Structures

2020 ◽  
Vol 10 (24) ◽  
pp. 8775
Author(s):  
Haiwei Guan ◽  
Yuji Tian
Keyword(s):  
Extreme Values ◽  
Simulation Method ◽  
Wind Load ◽  
Combination Method ◽  
Wind Effect ◽  
Building Structures ◽  
Combination Rules ◽  
Load Effect ◽  
Mean Values ◽  
Standard Deviations

Under the action of the same wind azimuth, the extreme values of the wind load effect components of building structures are generated in the along-wind, cross-wind, vertical, and torsional directions. In designing the wind-resistant structure, the extreme values of effect components need to be combined to determine the internal force envelope values of members. Complete quadratic combination (CQC) and Turkstra combination rules are often used to determine the combination value of extreme values of wind effect components. The extreme probability distribution expressions of the CQC, and the Turkstra and approximate rules, are derived. The simplified combination Equations and combination coefficients of the CQC and Turkstra approximate rules are proposed in this paper. We use the combination Equations and Monte Carlo simulation method to analyze the accuracy of Turkstra and its approximate rules. The results show that the combination extreme is associated with the correlation coefficients, mean values, ratios of standard deviations, and fluctuating extremes of effect components. The errors between Turkstra and its approximate rules are small when load effect components show a positive correlation. The errors are largest when the standard deviations of components are equal. Our research results provide a theoretical basis for the combination method of wind load effect components of building structures.

The Wind Tunnel Experiment Study of Wind Load on Jack-Up Drilling Unit

2012 ◽  
Author(s):  
Lin Yi ◽  
An-kang Hu ◽  
Jiang Wei ◽  
Xiong Fei
Keyword(s):  
Wind Tunnel ◽  
Wind Load ◽  
Wind Tunnel Experiment ◽  
Shape Coefficient ◽  
Reynolds Number Effects ◽  
Calculation Results ◽  
Drilling Unit ◽  
Aerodynamic Interference ◽  
Storm Condition ◽  
Jack Up

Owing to the characteristics of the Jack-up drilling unit, the environment loads are important factors to the structure safety of jack-up. The wind load takes up a much larger proportion in structure analysis, and it has been now paid more and more attention in the field of offshore engineering. According to the MODU rule, the projected area method is used to calculate wind load. The height coefficient Ch and shape coefficient Cs are chosen by experience listed in MODU rule. However, the aerodynamic interference between platform components, such as wind shielding effects and acceleration flow effects are ignored. So the calculation results in accordance with MODU rule are conservative, and not good for structure optimization designing to some degree. Therefore, the wind tunnel experiment is very important and necessary. In this paper, a 400ft jack-up, which is developed by CIMC, is studied as an example. Considering the Reynolds number effects, the wind loads of jack-up both in normal drilling condition and severe storm condition are obtained in the experiment. Compared with the results, which are calculated according to MODU rule, it indicates that the experiment results are less, and the effect of aerodynamic interference and updraft can’t be ignored.

Study on a Large-Span Steel Truss Roof Isolation Bearings for Wind Load Effect Isolation Effect

2013 ◽  
Vol 405-408 ◽  
pp. 1022-1027
Author(s):  
Zi Fen Fang ◽  
Zhi Qiang Zhang ◽  
Fei Liu
Keyword(s):  
Financial Services ◽  
Base Isolation ◽  
Wind Load ◽  
Isolation Effect ◽  
Load Effect ◽  
Large Span ◽  
Roof Structure ◽  
Rubber Bearing ◽  
Steel Truss ◽  
Load Effects

The isolation of large-span Steel Truss Roof structure is developed on the basis of base isolation. The isolation of large-span Steel Truss Roof structure is to limit the transmission of wind load effect to the substructure. Based on the engineering background, we mainly discuss using rubber bearing isolation structure wind load effects. This paper will explains and demonstrates the isolation mechanism of Large-span Steel Truss Structure,and than test and verify isolation effect by Calculating through the analysis of wind tunnel tests conducted on the Yancheng financial services center, which the steel truss roof isolation bearings for wind load effect isolation effect.

scholarly journals Wind load effect in topology optimization problems

2007 ◽  
Vol 75 ◽  
pp. 012048 ◽  
Author(s):  
R Zakhama ◽  
M M Abdalla ◽  
Z Gürdal ◽  
H Smaoui
Keyword(s):  
Topology Optimization ◽  
Optimization Problems ◽  
Wind Load ◽  
Load Effect

K-Type, Inverse K-Type and X-Type Legs Stability Analysis of Jack-Up Offshore Platform

2013 ◽  
Vol 312 ◽  
pp. 205-209
Author(s):  
Wen Xian Tang ◽  
Jun Cao ◽  
Jian Zhang ◽  
Chao Gao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Maximum Stress ◽  
Offshore Platform ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Design Requirements ◽  
The Stability ◽  
Jack Up ◽  
Survival Condition

The force situation of truss legs has an important impact on the jack-up offshore platform. The finite element analysis on three types truss leg was made, and the stability of the three types truss leg under preload, operating and storm survival condition was discussed. The result showed that the maximum stress was in the chord; they met the design requirements; K type, inverse K type can save material, and they both met resonance requirements. The former had a better stability under preload condition, and the later had the best stability under operating, storm survival condition.

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