scholarly journals Inverted pyramid Azores - an eternal hybrid structure

2021 ◽  
Vol 17 (3) ◽  
pp. 261-269
Author(s):  
Luís Pedro F R Sarmento Esteves
Keyword(s):  
Hybrid Structure ◽  
Ancient Egypt ◽  
Structural Function ◽  
Management Options ◽  
Engineering Structures ◽  
Structural Wall ◽  
Inverted Pyramid ◽  
Geometry Design ◽  
Modern Engineering ◽  
Design Loads

Engineering structures are designed with observation of rules for structural performance under specific design loads, defined in the so-called structural codes. While dead loads are directly dependent from the selection of structural materials to a given structural function, live and accidental loads are often linked to the region where the structure must perform. In a complete opposition to engineering principles in Ancient Egypt, the inverted pyramid was designed to become a statement of how to bend gravitational laws, and what can be achieved by modern engineering, sill with intelligence to fulfill its function in a region where engineering structures are subjected to extreme live and accidental load regimes, e.g. high risk of earthquakes and high wind seasonal loads. A hybrid structural concept was specified, comprising lightweight structural wall elements anchored to a relatively heavyweight structural core. The suggested design concept fulfills the global equilibrium equation defined by architecture, and should become a structural example from a structural design perspective. As any other project involving non-comprehensive geometry, design and construction of the inverted pyramid is highly sensible to management options, which shall assure high precision manufacturing, and accurate control of its production.

AN APPLICATION CONCEPT OF THE FIBRE-OPTICAL TECHNOLOGY IN GEODETIC MONITORING OF ENGINEERING OBJECTS

2017 ◽  
Vol 166 (46) ◽  
pp. 60-74
Author(s):  
Krzysztof Karsznia ◽  
Konrad Podawca
Keyword(s):  
Risk Management ◽  
Large Scale ◽  
State Of The Art ◽  
Monitoring Systems ◽  
Management Approach ◽  
Engineering Structures ◽  
Geoinformation Systems ◽  
Current State ◽  
Modern Engineering ◽  
Integrated Risk

Monitoring of structures and other different field objects undoubtedly belongs to the main issues of modern engineering. The use of technologies making it possible to implement structural monitoring makes it possible to build an integrated risk management approach combining instrumental solutions with geoinformation systems. In the studies of engineering structures, there is physical monitoring mainly used for examining the physical state of the object - so-called SHM ("Structural Health Monitoring"). However, very important role is also played by geodetic monitoring systems (GMS). The progress observed in the field of IT and automatics has opened new possibilities of using integrated systems on other, often large-scale objects. Based on the current state-of-the-art, the article presents the concept of integration approaches of physical and geodetic monitoring systems in order to develop useful guidelines for further construction of an expert risk management system.

Culture and discourse structure: A comparative study of Dutch and Iranian news texts

2017 ◽  
Vol 12 (1) ◽  
pp. 58-79 ◽  
Author(s):  
Afrooz Rafiee ◽  
Wilbert Spooren ◽  
José Sanders
Keyword(s):  
Relevant Literature ◽  
Narrative Structure ◽  
Hybrid Structure ◽  
Discourse Structure ◽  
Cultural Contexts ◽  
Two Cultures ◽  
Inverted Pyramid ◽  
The Two Cultures ◽  
Crime News ◽  
Dominant Structure

Many studies of structure in present-day Western news texts have shown that the dominant structure is the inverted pyramid, even if the use of a chronological narrative structure is acknowledged. However, the relevant literature has exclusively investigated Western news texts. In this study, we challenge the dominance of the inverted news structure by including a non-Western and less-investigated culture and ask whether textual structure of news texts can differ between cultural contexts. In total, 100 crime news texts from national Iranian and Dutch newspapers were analyzed for both the overall text and the journalists’ statements. Those texts that showed a hybrid structure (combining inverted pyramid and chronology) were subsequently studied qualitatively to understand how chronology is applied in them. News texts from the two cultures were significantly different in their structure. Qualitative analysis of the journalistic statements uncovered a quotation-based structure, a way of news writing in Iranian journalistic statements in which the journalist mainly narrates reporting eventualities that are new to Western eyes. The study offers implications for further ethnography of news and communication, suggesting that the role, pattern and effects of (journalistic) communication can be culture-specific.

scholarly journals An Exact Dynamic Analysis Method for Shallow Sagged Cables

2020 ◽  
Vol 38 (2) ◽  
pp. 451-457
Author(s):  
Yi Cao ◽  
Fei Han ◽  
Kai Yang ◽  
Yingluo Zhang
Keyword(s):  
Dynamic Analysis ◽  
Performance Monitoring ◽  
Dynamic Stiffness ◽  
Analytical Form ◽  
Frequency Equation ◽  
Analysis Method ◽  
Cable System ◽  
Engineering Structures ◽  
Cable Structure ◽  
Modern Engineering

With the increase of the span and height of modern engineering structures, the design complexity of the cable structure is constantly increasing, whose dynamic problem has become the key to structural design, performance monitoring and maintenance, and vibration control. Therefore, it is necessary to study and develop a new dynamic analysis theory for complex cable system with higher calculation accuracy and efficiency to meet the requirements of exact analysis of engineering structures. In view of this, a novel dynamic analysis method for shallow sagged cable system is proposed in this paper based on the dynamic stiffness method. Since the derivation process is given in analytical form, the calculation accuracy and efficiency are promoted greatly. The numerical cases are used to verify the accuracy of the proposed dynamic analysis method, meanwhile, the simulation results show that the proposed method can overcome the "root missing" phenomenon when solving the frequency equation by the existing analytical method.

Assessment of dissimilar joining between metal and polymer hybrid structure with different joining processes

2021 ◽  
pp. 089270572110485
Author(s):  
Bala Murali Nagarajan ◽  
Manikandan Manoharan
Keyword(s):  
Welding Process ◽  
Dissimilar Materials ◽  
Hybrid Structure ◽  
Bonding Mechanism ◽  
Engineering Structures ◽  
Corrosion Properties ◽  
Friction Stir ◽  
Hybrid Joint ◽  
Hybrid Joints ◽  
Innovation And Technology

In this century, innovation and technology are required to fabricate the hybrid joint of metal and polymers. Due to their lightweight and anti-corrosion properties, the mixed components are increasingly used to produce lightweight hybrid structures such as aerospace and automobiles. It is essential to develop welding techniques for joining dissimilar materials and instead use them in engineering structures. The bonding mechanism of the weld joint has varied depending upon the welding process. In the present review, the bonding mechanism of various hybrid joints like Friction stir welding (FSW), Friction stir spot joining, Friction riveting, laser welding, ultrasonic welding and induction welding is discussed in detail. The defects observed in the different welding process is discussed in details. The mechanical properties and microstructure analysis of different hybrid joints are reviewed in detail for a different combination of hybrid joints.

Simulating dune evolution on managed coastlines: Exploring management options with the Coastal Recovery from Storms Tool (CReST)

Shore & Beach ◽  
2019 ◽  
pp. 36-43
Author(s):  
Peter Ruggiero ◽  
Nicholas Cohn ◽  
Bas Hoonhout ◽  
Evan Goldstein ◽  
Sierd de Vries ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Time Scales ◽  
Complex Dynamics ◽  
Coastal Dunes ◽  
Anthropogenic Pressures ◽  
Model Framework ◽  
Management Options ◽  
Engineering Structures ◽  
Modeling Tools ◽  
Dune Grass

Despite the importance of coastal dunes to many low-lying coastal communities and ecosystems, our understanding of how both climatic and anthropogenic pressures affect foredune evolution on time scales of years to decades is relatively poor. However, recently developed coupled numerical modeling tools have allowed for the exploration of the erosion and growth of coastal foredunes on time scales of hours to years. For example, Windsurf is a new process-based numerical modeling system (Cohn et al. 2019a) that simulates the evolution of dune-backed sandy coastal systems in response to wave, wind, and water level forcings. CReST, developed as a front-end interface to Windsurf, aims to add the ability to incorporate beach nourishment and dune construction, beach and dune grading, dune grass planting scenarios, dune grass removal, and the presence of hard engineering structures into the model framework to better account for the complex dynamics of managed coastlines. Initial model sensitivity tests suggest that the model provides a flexible framework to investigate the complex interactions between beaches and dunes for a variety of exploratory and applied applications.

scholarly journals Geospatial Monitoring and Structural Mechanics Models: a Case Study of Sports Structures

2020 ◽  
Author(s):  
Roman Shults ◽  
Saule Soltabayeva ◽  
Gulnur Seitkazina ◽  
Zhupargul Nukarbekova ◽  
Oksana Kucherenko
Keyword(s):  
Structural Mechanics ◽  
Data Simulation ◽  
Engineering Structures ◽  
Vast Number ◽  
Modern Engineering ◽  
Depth Analysis ◽  
Monitoring Accuracy ◽  
Improved Technology ◽  
The Impact ◽  
Football Stadium

The task of geospatial monitoring is one of the most common in the practice of geodetic works. In the twentieth century, the basic principles for carrying out geospatial monitoring, accuracy calculation, observation intervals assignment, and data simulation were developed. However, since that time, both the building and geodetic technologies have been changed considerably. Among modern engineering structures, the building technology of which has undergone significant changes are sport structures. The use of the state-of-the-art sport structures is associated with the presence of specific loads, name a few: the impact of a vast number of spectators (e.g., stadiums, cycle tracks, etc.) or loads directly from the competitions equipment (e.g., bobsleigh tracks, race tracks, etc.). The primary goal of the presented paper is to develop a general approach to the preliminary accuracy calculation of the geospatial monitoring of the sports structures using the methods of structural mechanics. As an example, a football stadium was considered. Based on the simulation, the improved technology of geospatial monitoring for the sports structure was suggested. The in-depth analysis of the creation of geodetic networks for geospatial monitoring was accomplished. At the final step, the results of geospatial monitoring for the football stadium were analyzed, and hands-on recommendations were made.

Exact Dynamic Analysis of Shallow Sagged Cable System — Theory and Experimental Verification

2019 ◽  
Vol 19 (12) ◽  
pp. 1950153 ◽  
Author(s):  
Fei Han ◽  
Yingluo Zhang ◽  
Jubao Zang ◽  
Ning Zhen
Keyword(s):  
Dynamic Analysis ◽  
Performance Monitoring ◽  
Dynamic Stiffness ◽  
Analytical Form ◽  
Frequency Equation ◽  
Cable System ◽  
Engineering Structures ◽  
Analysis Theory ◽  
Modern Engineering ◽  
Iteration Methods

With the increase of the span and height of modern engineering structures, the design length of engineering cables is increasing while the structural form is becoming more complicated, whose dynamic problem has become the key to structural design, performance monitoring and maintenance and vibration control. Therefore, it is necessary to study and develop a unified dynamic analysis theory for complex cable system with high calculation accuracy and efficiency to meet the requirements of exact analysis of engineering structures. In view of this, a unified dynamic analysis method for shallow sagged cable system is proposed in this paper based on the dynamic stiffness method. Since the derivation process is given in analytical form, the calculation accuracy and efficiency are promoted greatly. Full-scale cable test and numerical cases are used to verify the accuracy of the proposed method. Results show that the proposed method is in good agreement with the measured results and can effectively overcome the “root-missing” phenomenon existing in conventional iteration methods when solving the transcendental frequency equation.

Study on Seismic Performance of Steel Tube Filled with Steel Reinforced High-Strength Concrete Column

2013 ◽  
Vol 353-356 ◽  
pp. 2206-2209
Author(s):  
Bing Wang ◽  
Lu Ma ◽  
Xiao Liu
Keyword(s):  
Seismic Performance ◽  
High Strength Concrete ◽  
High Strength ◽  
Steel Tube ◽  
Concrete Column ◽  
Present Stage ◽  
Engineering Structures ◽  
Strength Concrete ◽  
Modern Engineering ◽  
Harsh Conditions

Steel tube filled with steel high-strength concrete composite column which is made by insert into the I-beam inside the steel tube, and then poured into the high-strength concrete, to form a composite structure. It preserves the advantages of concrete filled steel tube and steel skeleton concrete, and has a higher carrying capacitybetter seismic performance and fire resistance, satisfy the needs of modern engineering structures towards large spanhigh-riseheavy-load and harsh conditions direction development, has broad market prospects. This paper mainly from the work principlemechanical characteristics and current situation of the development the three aspects elaborated the present stage study the significance on the seismic performance of steel tube filled with steel high-strength concrete.

Sign in / Sign up

Export Citation Format

Share Document