GB/T 36409-2018 in English

VALID

Method of structural design for self-elevating units—Load and resistance factor design (LRFD) method

Issued on:2018-06-07
Implemented on:2019-01-01
File Format:PDF
Delivery:Via email within 5 business days

Price(USD)： $370.00
$359.00

Standard No:	GB/T 36409-2018
Document status:	VALID
Title in English:	Method of structural design for self-elevating units—Load and resistance factor design (LRFD) method
Title in Chinese:	自升式平台结构设计方法载荷抗力系数设计法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2018-06-07
Implemented on:	2019-01-01
ICS Classification:	47.020.99-Other standards related to shipbuilding and marine structures
Chinese Classification:	U11-Ship theory and model test
Professional Classification:	GB-National Standard
Related Keywords:	lrfd design method using load resistance factor design structural design typesenvironmental load factor γf design structural classificationdivision
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《GB/T 36409-2018自升式平台结构设计方法载荷抗力系数设计法》由TC12（全国海洋船标准化技术委员会）归口，主管部门为国家标准化管理委员会。

Introduction

Core content structure of the standard

Technical module	Main content	Key points of design
Structural classification	Division of primary/secondary/special components	Determination of detection requirements based on failure consequences
Material selection	Correlation between steel grade and temperature	EH690 steel for rack system
Load combination	7 major load types	Environmental load factor γ_f,E=1.2
Limit state	ULS/FLS/ALS	Material factor γ_M=1.15

Analysis of key technical points

1. Structural classification system

The standard divides structural components into three categories:

Main components: such as pile leg outer plate, elevator room support structure, etc., failure will lead to overall collapse
Special components: including stress concentration areas such as pile leg-pile shoe connection
Secondary components: local components such as non-load-bearing bulkheads

2. LRFD design method

Using load partial factor combination:

Combination a	γ_f,G,Q=1.2	γ_f,E=0.7
Combination b	γ_f,G,Q=1.0	γ_f,E=1.2

The second-order effect amplification factor shall be considered in the pile leg design: α=1/(1-P/P_E)

3. Fatigue assessment requirements

Typical node processing: The truss type pile leg node shall be subjected to local refined finite element analysis to determine the stress concentration factor.
Design fatigue coefficient is divided into three levels of 1.0/2.0/3.0 according to accessibility

Implementation suggestions

Pile leg analysis should adopt nonlinear time domain method to consider P-Δ effect
Rack material must meet the yield strength requirement of 690MPa
Preload capacity verification formula: F_VP/F_V≥1/(1-2√AM_U/πR²F_V)