Efficient Static Analysis and Design of Flexible Risers

1991 ◽  
Vol 113 (3) ◽  
pp. 235-240 ◽  
Author(s):  
H. R. Riggs ◽  
T. Leraand
Keyword(s):  
Static Analysis ◽  
Design Method ◽  
Single Element ◽  
Flexible Riser ◽  
Analysis And Design ◽  
Drag Forces ◽  
Adaptive Discretization ◽  
Fluid Drag ◽  
Flexible Risers ◽  
Marine Cables

An improved cable element for static analysis is presented based on the equations of an elastic catenary. The element includes an algorithm for adaptive discretization when fluid drag forces are present. Hence, a single element can be used to model many marine cables, regardless of length. The element is applied to flexible riser analysis and preliminary design, which is automated by solving a nonlinear programming problem. Results demonstrate that a practical automated design method can be developed following the procedure presented here.

Pengembangan Sistem Informasi Siklus Pendapatan pada PT XYZ (Pendekatan Studi Kasus)

2014 ◽  
Vol 5 (1) ◽  
pp. 12-19
Author(s):  
Yohannes Kurniawan ◽  
Janastasha Christie Parapaga
Keyword(s):  
Information System ◽  
Information Systems ◽  
Business Processes ◽  
Design Method ◽  
Accounting Information ◽  
Accounting Information System ◽  
Accounting Information Systems ◽  
Analysis And Design ◽  
Research Goal ◽  
Revenue Cycle

The research goal is to identify and analyze the need of accounting information system related to the revenue cycle at PT XYZ. This paper designing the useful of accounting information systems to support the current business processes, especially on the revenue cycle process. The design method is an Object Oriented Analysis and Design (OOAD) which refers to the modeling and design requirements discipline. And the result achieved by analysis and design of accounting information systems can support current activities of the revenue cycle, especially for the documentation and store of transaction data, and generate reports in accordance with company requirements. Conclusions derived from the analysis and design is the implementation of a webbased application that can help PT XYZ to do the work in different places, such as marketing office, head office and especially at the exhibition. Index Terms - Accounting Information System, revenue cycle, OOAD 

Cathodic Protection Design Consideration for an Offshore Flexible Riser Connected to an Impressed Current System

2021 ◽  
Author(s):  
Thierry Dequin ◽  
Clark Weldon ◽  
Matthew Hense
Keyword(s):  
Cathodic Protection ◽  
Sacrificial Anode ◽  
Flexible Riser ◽  
Flexible Pipe ◽  
Linear Resistance ◽  
Flexible Pipes ◽  
Flexible Risers ◽  
Impressed Current ◽  
Host Structure ◽  
Impressed Current Cathodic Protection

Abstract Flexible risers are regularly used to produce oil and gas in subsea production systems and by nature interconnect the subsea production system to the floating or fixed host facilities. Unbonded flexible pipes are made of a combination of metallic and non-metallic layers, each layer being individually terminated at each extremity by complex end fittings. Mostly submerged in seawater, the metallic parts require careful material selection and cathodic protection (CP) to survive the expected service life. Design engineers must determine whether the flexible pipe risers should be electrically connected to the host in order to receive cathodic protection current or be electrically isolated. If the host structure is equipped with a sacrificial anode system, then electrical continuity between the riser and the host structure is generally preferred. The exception is often when the riser and host structure are operated by separate organizations, in which case electrical isolation may be preferred simply to provide delineation of ownership between the two CP systems. The paper discusses these interface issues between hull and subsea where the hull is equipped with an impressed current cathodic protection (ICCP) system, and provides guidance for addressing them during flexible pipe CP design, operation, and monitoring. Specifically, CP design philosophies for flexible risers will be addressed with respect to manufacturing, installation and interface with the host structure’s Impressed Current Cathodic Protection (ICCP) system. The discussion will emphasize the importance of early coordination between the host structure ICCP system designers and the subsea SACP system designers, and will include recommendations for CP system computer modeling, CP system design operation and CP system monitoring. One of the challenges is to understand what to consider for the exposed surfaces in the flexible pipes and its multiple layers, and also the evaluation of the linear resistance of each riser segment. The linear resistance of the riser is a major determinant with respect to potential attenuation, which in turn largely determines the extent of current drain between the subsea sacrificial anode system and the hull ICCP system. To model the flexible riser CP system behavior for self-protection, linear resistance may be maximized, however the use of a realistic linear resistance is recommended for evaluation of the interaction between the host structure and subsea system. Realistic flexible linear resistance would also reduce conservatism in the CP design, potentially save time during the offshore campaign by reducing anode quantities, and also providing correct evaluation of drain current and stray currents.

PUSHOVER ANALYSIS BY ONE ELEMENT PER MEMBER FOR PERFORMANCE-BASED SEISMIC DESIGN

2010 ◽  
Vol 10 (01) ◽  
pp. 111-126 ◽  
Author(s):  
S. W. LIU ◽  
Y. P. LIU ◽  
S. L. CHAN
Keyword(s):  
Seismic Design ◽  
Design Method ◽  
Pushover Analysis ◽  
Nonlinear Behavior ◽  
Computational Effort ◽  
Effective Length ◽  
Single Element ◽  
Individual Element ◽  
Economical Design ◽  
Performance Based Seismic Design

Nonlinear static (pushover) analysis is an effective and simple tool for evaluating the seismic response of structures and offers an attractive choice for the performance-based design. As such, it has generally been used in modern design due to its practicality. However, the nonlinear plastic design method consumes extensive computational effort for practical structures under numerous load cases. Thus, an efficient element capturing the nonlinear behavior of a beam-column will be useful. In this paper, the authors propose a practical pushover analysis procedure using a single element per member for seismic design. As an improvement to previous research works, both P – Δ and P – δ effects as well as initial imperfections in global and member levels are considered. Therefore, the section capacity check without the assumption of effective length is adequate for present design and the conventional individual element design is avoided. The uncertainty of the buckling effects and effective length method can be eliminated and so a more economical design can be achieved. Two benchmark steel frames of three-storey and nine-storey in FEMA 440 were analyzed to illustrate the validity of the proposed method.

scholarly journals Analysis and Design of E-Commerce Information Systems Using the User Centered Design Method at PT. Pure Healthy Nature

Tech-E ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 16
Author(s):  
Amelia Andi ◽  
Yakub Yakub
Keyword(s):  
Design Method ◽  
User Centered Design ◽  
Activity Diagram ◽  
Marketing Department ◽  
Analysis And Design ◽  
Program Language ◽  
System Use ◽  
Uml Activity Diagram ◽  
Search Information ◽  
User Centered

PT.Murni Alam Sehat is one of company sell medical device and medicine by prescription or without doctor’s prescription. The problem in marketing department in this company do not have promotion media for offer the products to consumer, no online sell, and order only by phone. To solve the problem in marketing department is build up e-commerce system. E-commerce system use Unifed Modelling Languange (UML); Activity Diagram, Use Case Diagram, Sequence Diagram, and Class Diagram. User Centered Design (UCD) as design method. Program language for e-commerce system is PHP and MySQL for database. The result of research is a e-commerce system website base to help search information product, company could get report easier, consumer can do purchase by online everywhere and everytime.

scholarly journals Perancangan Sistem Monitoring dan Evaluasi Bantuan Usaha Pertanian pada Kementerian Pertanian Ri

2013 ◽  
Vol 4 (2) ◽  
pp. 706
Author(s):  
Yohannes Kurniawan ◽  
Devyano Luhukay ◽  
Titan Titan
Keyword(s):  
Information System ◽  
Interface Design ◽  
Design Method ◽  
Current System ◽  
Monitoring And Evaluation ◽  
Internet Technology ◽  
Accurate Information ◽  
Analysis And Design ◽  
Optimal Information ◽  
Production Facilities

The main problems of current system in agriculture ministry is sub-optimal information retrieval of realization and development of agriculture capital and production facilities subvention. Therefore, this research aims to analyze and design information system for monitoring and evaluation of subvention of agriculture capital and production facilities. This information system is developed based on internet technology to help the main team (agriculture minister and technical team of directorate agriculture department), coach team of provincial agriculture office, and technical team of district/city agriculture office to access the accurate information related realization and development of agriculture business any where and any time. It is designed with OOAD (object oriented analysis and design) method by using UML notation (use case diagram, class diagram, component architecture and user interface design). This research produces a design of information system for subvention monitoring and evaluation of agriculture capital and production facilities for the ministry of agriculture RI.

Evaluation of Negative Skin Friction on Bridge Abutment Piles

2021 ◽  
Vol 15 (2) ◽  
Author(s):  
Osama Drbe
Keyword(s):  
Skin Friction ◽  
Pore Water Pressure ◽  
Design Method ◽  
Water Pressure ◽  
Strain Gauges ◽  
Total Stress ◽  
Vibrating Wire ◽  
Negative Skin Friction ◽  
Drag Forces ◽  
Wire Strain

Piles are used to transfer loads of structures to deeper and stronger soil layers through skin friction and/or end bearing. Surcharge loads, site grading, or dewatering may induce downward movement of soil adjacent to piles installed in a compressible medium. This movement creates negative skin friction stresses acting downward at the pile-soil interface, which applies additional loads “drag forces” to the pile causing a maximum axial load in the pile shaft at the “neutral plane”. To evaluate the development of drag forces, a comprehensive field monitoring program was conducted over four years for three instrumented abutment H-piles as part of a three-span bridge project. The soil settlement and changes in pore water pressure in the soil adjacent to the piles due to the construction of an approach embankment were monitored using multiple-point extensometers and vibrating wire piezometers. The piles’ elastic settlement and strains were measured using single-point extensometers and vibrating wire strain gauges. The field measurements are presented and discussed in terms of responses time histories and load distribution along one pile shaft. In addition, the calculated forces from vibrating wire strain gauges are compared with the unified design method prediction considering the total stress method (α-method) for cohesive soils. The results show that the maximum drag force was developed after the complete dissipation of excess pore water pressure and that the location of neutral plane varied during the embankment construction stages. Employing the total stress method in the unified design method provided a reasonable prediction of the drag force and the neutral plane’s location.

Analysis on Overturning of Single Pier Bridge and Reinforcement Design Method

2011 ◽  
Vol 105-107 ◽  
pp. 1338-1341 ◽  
Author(s):  
Guo Yong Huang ◽  
Chang Qing Lan ◽  
Xu Lan
Keyword(s):  
Design Method ◽  
Horizontal Direction ◽  
Analysis And Design ◽  
Single Column ◽  
Distribution Mode ◽  
Reinforcement Measures ◽  
Reinforcement Design ◽  
Load Size ◽  
Main Girder

With the lesson from the overturning accident of single-pier bridge and based on the analysis on the size and distribution mode of the load on the bridge surface when the ramp bridge of Tianjin segment in the Jin-Jin Expressway collapsed, this Article drafts the load size and distribution mode are (possibly undertaking up to 4x165t load) studied out for analysis and design of single pier bridge of pier-girder consolidation for the analysis on the calculation of the overturning resistance for single-column girder, and analyzes the overturning resistance capacity of single-column girder with pier-girder consolidation according the planned load size and distribution mode. In addition, this Article proposes the reinforcement measures by adding the column supports at the horizontal direction of the single-column pier, thus effectively improving the overturning resistance capacity of main girder. This Article may be used as the reference for the study of overturning resistance and the reinforcement of single-column pier bridge.

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