A microcomputer-based analysis and design of air-supported cylindrical membranes

1992 ◽  
Vol 19 (6) ◽  
pp. 1032-1040 ◽  
Author(s):  
N. Turkkan ◽  
N. K. Srivastava
Keyword(s):  
Membrane Structure ◽  
Reliable Method ◽  
Approximate Analysis ◽  
Design Practice ◽  
Analysis And Design ◽  
Supported Membrane ◽  
Dominant Design ◽  
Current Design ◽  
Design Loads ◽  
Analysis Design

An approximate, simple, and reliable method of analysis is presented for an air-supported cylindrical membrane structure. Furthermore, to use this method of analysis for design purposes, a brief description of dominant design loads and its formulation as applied to air-supported structures is also given based on design practice and experiments. Incorporating both the method of analysis and the described design loads, a microcomputer-based program, coded in MS Quickbasic, has been developed, which is simple to use and completely user friendly.First, the reliability of the approach is established by comparing it with available published studies on circular cylindrical air-supported structures, based on rigorous modelling and analysis. Then, several illustrative examples are presented for different heights and spans under various loading combinations as per current design practice. Key words: air-supported membrane, cylindrical, finite displacement, microcomputer based, approximate, analysis, design.

Factored axial compressive resistance of schifflerized angles

1991 ◽  
Vol 18 (6) ◽  
pp. 926-932 ◽  
Author(s):  
Seshu Madhava Rao Adluri ◽  
Murty K. S. Madugula
Keyword(s):  
Key Words ◽  
Design Method ◽  
Design Criteria ◽  
Design Practice ◽  
Buckling Mode ◽  
Flexural Buckling ◽  
Mode Of Failure ◽  
Current Design ◽  
Similarities And Differences ◽  
Compressive Resistance

The concept of schifflerization of 90° equal-leg angle is presented and its application in triangular-base latticed steel towers is explained. The similarities and differences between schifflerized angles and regular 90° angles are discussed. The current design practice for schifflerized angles is reviewed and its limitation is highlighted. A design method which includes the effect of the torsional-flexural buckling mode of failure is proposed. For ready use of designers, the factored axial compressive resistances of schifflerized angles are tabulated for both the present and proposed design methods. Key words: buckling, compressive resistance, design criteria, schifflerized angles, stability, standards, steel, struts, towers, guyed towers.

scholarly journals Beyond Discipline: Evolving Design Practice and Design Education in the Twenty-First Century

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Lara Furniss
Keyword(s):  
Undergraduate Education ◽  
Design Education ◽  
The Body ◽  
First Century ◽  
Design Practice ◽  
Creative Processes ◽  
Ethnographic Studies ◽  
Current Design ◽  
Twenty First Century ◽  
The Uk

Since 2000, design practice in the UK has changed dramatically. Boundaries between design disciplines have dissolved, and many contemporary design studios now defy classification. These studios are reconfiguring the design landscape, yet a uni-disciplinary structure still dominates undergraduate education. This is creating a disconnection between practice and education and posing critical questions for the current design education system. This article outlines the findings of a PhD research study exploring this disconnection, and although situated within the UK, the findings have international relevance. An initial scoping exercise draws on interviews with leading commentators from the UK design sector, examining the evolution of design practice over the past 10 years, and possible future directions for undergraduate education. Findings highlight that UK policy for creative education has placed undergraduate design courses in potential crisis. Arguably, the current university system for design education is outdated. It is now necessary to redefine the skills and processes twenty-first-century designers need. The body of the research is situated within five internationally renowned creative studios which defy classification. In-depth ethnographic studies cross-analyse the creative processes of these studios and their views on education. Findings identify key components of each studio’s processes, while also exploring studio members’ educational experiences, and reflections on future implications for pedagogy. This article argues that this growing disconnect between practice and education calls for existing pedagogic models to be challenged, proposes alternative approaches and highlights the need for policymakers, practitioners and educators to work together to best prepare young designers to meet today’s challenges.

Impact of Climate Change and Extreme Waves on Tanker Design

2014 ◽  
Author(s):  
Elzbieta M. Bitner-Gregersen ◽  
Torfinn Hørte ◽  
Lars Ingolf Eide ◽  
Erik Vanem
Keyword(s):  
Climate Change ◽  
Rogue Waves ◽  
Extreme Weather ◽  
Ship Design ◽  
Extreme Weather Events ◽  
Design Practice ◽  
Storm Activity ◽  
Activity Intensity ◽  
Weather Events ◽  
Current Design

Global warming and extreme weather events reported in the last years have attracted a lot of attention not only in academia and media but also in the shipping industry. Three important questions have been in focus: will occurrence of extreme weather events increase in the future, which geographical locations will be most affected, and to what degree will climate change affect future ship traffic and design of ship structures. Observed and projected changes in wave conditions are expected to have the largest effect on ship design and operations in comparison to other environmental phenomena. The present study briefly summarizes recent investigations addressing changes of significant wave height in the North Atlantic, including the last findings of IPCC (Intergovernmental Panel on Climate Change), and discusses how these changes can be included in environmental description used for ship design. It is also interesting to notice that climate changes resulting in some ocean regions in increase of storm activity (intensity, duration and fetch) and changes of storm tracks may result in secondary effects such as increased frequency of occurrence of abnormal waves, also called rogue or freak waves. This study shows how the scientific findings on climate change and rogue waves can be incorporated in the risk-based approach used in current design practice of tankers, and ships structures in general. Further, it demonstrates the effect of climate change and rogue waves on tanker design, particularly on the safety level of current design practice. Finally, the present paper discusses how structural design of ships can be upgraded to account for climate change and rogue waves but economic consequences do not need to be significant.

Requirements Analysis and Implementation

2012 ◽  
pp. 525-538
Author(s):  
Ali Ardalan ◽  
Roya K. Ardalan ◽  
Samuel Coppage
Keyword(s):  
Information System ◽  
Systems Analysis ◽  
Group Discussions ◽  
Analysis And Design ◽  
Systems Analysis And Design ◽  
Design And Implementation ◽  
It Systems ◽  
Analysis Design ◽  
Electronic Information System ◽  
New System

This case deals with issues related to conversion of a mostly manual information system to an electronic information system where the new system significantly changes the way users interact with the system. The case focuses on the elements of analysis and design, followed by implementation and results. This case provides scenarios and settings that may be used for role plays and group discussions to highlight the importance and the need for following the accepted systems analysis and design steps in the analysis, design, and implementation of IT systems.

Main Issues on the Seismic Design of Industrial Piping Systems and Components

2013 ◽  
Author(s):  
Fabrizio Paolacci ◽  
Md. Shahin Reza ◽  
Oreste S. Bursi ◽  
Arnold M. Gresnigt ◽  
Anil Kumar
Keyword(s):  
Seismic Design ◽  
Seismic Analysis ◽  
Experimental Investigations ◽  
Piping System ◽  
Analysis And Design ◽  
Correct Definition ◽  
Component Design ◽  
Piping Systems ◽  
Current Design ◽  
Bolted Flange

A significant number of damages in piping systems and components during recent seismic events have been reported in literature which calls for a proper seismic design of these structures. Nevertheless, there exists an inadequacy of proper seismic analysis and design rules for a piping system and its components. Current seismic design Codes are found to be over conservative and some components, e.g., bolted flange joints, do not have guidelines for their seismic design. Along this line, this paper discusses about the main issues on the seismic analysis and design of industrial piping systems and components. Initially, seismic analysis and component design of refinery piping systems are described. A review of current design approaches suggested by European (EN13480:3) and American (ASME B31.3) Codes is performed through a Case Study on a piping system. Some limits of available Codes are identified and a number of critical aspects of the problem e.g., dynamic interaction between pipes and rack, correct definition of the response factor and strain versus stress approach, are illustrated. Finally, seismic performance of bolted flange joints based on the results of experimental investigations carried out by the University of Trento, Italy, will be discussed.

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