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.

Development of Limit State Design for Fast Reactor by System Based Code

2013 ◽  
Author(s):  
Daigo Watanabe ◽  
Yasuharu Chuman ◽  
Tai Asayama ◽  
Shigeru Takaya ◽  
Hideo Machida ◽  
...  
Keyword(s):  
Fast Reactor ◽  
Thermal Load ◽  
Design Method ◽  
Limit State ◽  
Reactor Vessel ◽  
Design Criteria ◽  
Plant Design ◽  
Allowable Stress ◽  
Limit State Design ◽  
Current Design

Limit state design was newly developed in order to apply the margin exchange which is one of the innovative concepts of the System Based Code (SBC). It was shown that limit state design method is applicable to plant design instead of current design criteria. In this report, working example of a reactor vessel of a Fast Reactor subject to thermal load is conducted to demonstrate this concept. As the result allowable stress was increased by changing the acceptance criteria from current design criteria to limit state design criteria.

Researches on the Shear Deformation of Joints Domain of Beam-to-Column Connection of Light Steel Structure

2012 ◽  
Vol 256-259 ◽  
pp. 1004-1007
Author(s):  
Xi Bing Hu ◽  
Jian Hua Lu
Keyword(s):  
Finite Element Method ◽  
Shear Deformation ◽  
Design Method ◽  
Steel Structure ◽  
Structure Calculation ◽  
The Finite Element Method ◽  
Mechanics Performance ◽  
Current Design ◽  
Internal Forces ◽  
Complex Parts

The joint domain of beam-to-column connection is very complex parts under loading, which plays an important role in transferring internal forces in light steel structure, such as moment, shear, axial force and so on. Considering the influence of its shear deformation in the structure calculation can help us to reflect the actual mechanics performance and evaluate precisely practical bearing capacity of the structure. According to the actual characteristics of beam-to-column connection, the author established some models of its joint domain, and used the finite element method to analyze and calculate shear deformation of these models. Meanwhile, the author researched the influence of the changes of various parameters to its shear deformation, and provided beneficial suggestions for revising the current design method of light steel structure finally.

scholarly journals Fitness Center Design with Natural Shapes and Forms Approach in Surabaya

2021 ◽  
Vol 1 (1) ◽  
pp. 15-21
Author(s):  
Pande Putu Dwi Novigga Artha
Keyword(s):  
Psychological Health ◽  
Design Method ◽  
Design Criteria ◽  
Fitness Center ◽  
The People ◽  
Physical And Psychological Health ◽  
Special Approach ◽  
The City

Density of Surabaya city affects the physical and psychological health of the people. Productive activities accompanied by a dense environment mean that people rarely have time to exercise. To increase the awareness and interest of the people of the city of Surabaya to exercise, it is necessary to have a sports facility with a special approach. Biophilic theory, especially the natural shapes and form approach, can be a solution to these problems. The return of nature's essence into the building can provide positive benefits for human physical and physical health. Previous research has discussed the determination of fitness center design criteria with the natural shapes and forms approach in Surabaya. In this follow-up journal, we will discuss the final result or application of the design criteria into an architectural work. The design method used is the force based framework method. The force in the design of this building in addition to the surrounding natural environment is the natural perception of the community which is transformed into architectural forms. It aims to increase interest in training and restoring the user's physical and psychological health without having to go far out of town to look for nature.

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.

Primary Design of Vaneless Diffusers of Centrifugal Compressor Stages by the Universal Modeling Method

2021 ◽  
pp. 39-52
Author(s):  
O.A. Solovyeva ◽  
K.V. Soldatova ◽  
Y.B. Galerkin ◽  
A.F. Rekstin
Keyword(s):  
Continuous Flow ◽  
Design Method ◽  
Modeling Method ◽  
Inlet Section ◽  
Relative Width ◽  
Design Practice ◽  
Main Section ◽  
Flow Angle ◽  
Gas Dynamic ◽  
Vaneless Diffusers

Vaneless diffusers of industrial centrifugal compressors most often consist of a tapered inlet section and a parallel-walled main section. The study proposes to choose such a width of the main section, at which the flow in the diffuser remains unseparated at the surge limit. To implement the primary design method, an empirical formula was obtained to determine the minimum continuous flow angle depending on the relative width of the diffuser. The primary design of eighteen stages was completed, covering a practically important range of parameters. The corresponding gas-dynamic characteristics were calculated by the universal modeling method, the dimensions and angles of the flow were analyzed. The proposed primary design method is integrated into the universal modeling method and is used in design practice.

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.

Meccanismi e valutazione: un confronto tra approcci

2009 ◽  
pp. 27-51
Author(s):  
Ferruccio Biolcati Rinaldi
Keyword(s):  
Key Words ◽  
Bounded Rationality ◽  
Program Theory ◽  
Implementation Theory ◽  
Evaluation Theory ◽  
Realistic Evaluation ◽  
Similarities And Differences ◽  
Evaluation Mechanism

- The paper introduces theory-oriented evaluation, a set of approaches that argue for a stronger role of theory in evaluation. Theory-oriented evaluation criticizes mainstream objectives-inputs-outputs evaluation for poor contribution to knowledge cumulation due according to these authors - to the overwhelming role played by method. The paper develops a comparison between the two most influential approaches in theory-oriented evaluation, i.e. Carol Weiss' theory-based evaluation and its concepts of program theory and implementation theory, and realistic evaluation by Ray Pawson and Nick Tilley, based on the concepts of context, mechanism and outcome. For each of them principal features and problems will be discussed; moreover, a strict comparison will be worked out to define similarities and differences.Key words: theory-based evaluation, realistic evaluation, mechanism, context, implementation, perfect and bounded rationalityParole chiave: valutazione basata sulla teoria, valutazione realistica, meccanismo, contesto, implementazione, razionalitŕ assoluta e limitata

scholarly journals Elastic Critical Axial Force for the Torsional-Flexural Buckling of Thin-Walled Metal Members: An Approximate Method

2015 ◽  
Vol 23 (1) ◽  
pp. 23-32 ◽  
Author(s):  
Michal Kováč
Keyword(s):  
Differential Equations ◽  
Approximate Method ◽  
Axial Force ◽  
Reference Method ◽  
Critical Force ◽  
Buckling Mode ◽  
Flexural Buckling ◽  
Coupled Equations ◽  
Thin Walled ◽  
Critical Axial Force

Abstract Thin-walled centrically compressed members with non-symmetrical or mono-symmetrical cross-sections can buckle in a torsional-flexural buckling mode. Vlasov developed a system of governing differential equations of the stability of such member cases. Solving these coupled equations in an analytic way is only possible in simple cases. Therefore, Goľdenvejzer introduced an approximate method for the solution of this system to calculate the critical axial force of torsional-flexural buckling. Moreover, this can also be used in cases of members with various boundary conditions in bending and torsion. This approximate method for the calculation of critical force has been adopted into norms. Nowadays, we can also solve governing differential equations by numerical methods, such as the finite element method (FEM). Therefore, in this paper, the results of the approximate method and the FEM were compared to each other, while considering the FEM as a reference method. This comparison shows any discrepancies of the approximate method. Attention was also paid to when and why discrepancies occur. The approximate method can be used in practice by considering some simplifications, which ensure safe results.

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