scholarly journals Interfacial Bond Performance of Concrete-Filled Steel Tubes under Fire and Postfire Conditions: State-of-the-Art Review

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Yuanyuan Xue ◽  
Jun Chen ◽  
Zurong Cai ◽  
Yanhua Zou
Keyword(s):  
High Temperature ◽  
Bond Strength ◽  
New Technologies ◽  
Future Research ◽  
Engineering Practice ◽  
Fire Exposure ◽  
Steel Tubes ◽  
Bonding Performance ◽  
Bonding Properties ◽  
Concrete Filled Steel Tubes

The critical influencing factors of the interface bonding properties of concrete-filled steel tubes (CFSTs) under fire and postfire conditions are analyzed. This paper analyzes and summarizes the existing research related to the bonding performance of CFST interfaces under fire and postfire conditions at home and abroad, which includes the bonding mechanism of CFST structures, the bonding strength of CFSTs during and after fire exposure, and the main factors influencing bond strength. The analysis results indicate that the temperature has noticeable influences on the bond strength of a CFST during and after fire exposure. The bond strengths of the specimens are reduced more severely under high-temperature conditions than after high-temperature cooling. Shear connectors can significantly improve the bonding performance of CFSTs and effectively reduce the relative slip between steel tubes and concrete. The paper concludes with an analysis of the deficiencies in bond-slip research on the bonding properties of the CFST interface during and after fire exposure and future research directions. First, we can study the use of new technologies and materials to solve the problem of bonding and slipping of CFSTs during and after fire exposure. Second, we can perform extensive experimental research and theoretical simulation analysis to enrich the research in this field, which can provide a reference for engineering practice.

scholarly journals Fire Exposure Behavior of CFST Column

2019 ◽  
Vol 8 (10) ◽  
pp. 218-223
Keyword(s):  
Testing Machine ◽  
Steel Tube ◽  
Fire Exposure ◽  
Quality Estimation ◽  
Steel Tubes ◽  
Quality Properties ◽  
Cooling Period ◽  
The Past ◽  
Universal Testing ◽  
Concrete Filled Steel Tubes

From the past numerous years Concrete Filled Steel Tubes (CFST) segments are progressively utilized in the structures on account of their high burden bearing limit. In CFST sections the solid is encased in a steel tube that gives formwork to solid which aides in continuing the nearby clasping of the steel. Additionally, composite sections will add more solidness to the structure when contrasted with the ordinary segments. This paper displays the Fire Exposure Behavior of CFST sections and the temperature in the diesel heater is pursued by the ISO-834 standard flame bend. The example was chilled off for 24 hours at room temperature in the wake of warming. During the cooling period of the example the weakening of solid happens. At long last, the quality estimation of CFST sections is tried under Universal Testing Machine (UTM). The examination centers around the quality properties of the roundabout CFST sections in the wake of being presented to a very controlled temperature in the diesel heater.

Study on the interfacial bonding behaviour of corroded steel bars and TRC constrained concrete

2019 ◽  
Vol 66 (5) ◽  
pp. 661-670
Author(s):  
Chang-Shun Hu ◽  
Shiping Yin ◽  
Meng-Ti Yin
Keyword(s):  
Bond Strength ◽  
Interfacial Bonding ◽  
Detectable Effect ◽  
Textile Reinforced Concrete ◽  
Content Type ◽  
Bonding Performance ◽  
Pull Out ◽  
Steel Bars ◽  
Bonding Properties ◽  
Ultimate Bond Strength

Purpose This paper aims to evaluate the bonding properties of textile reinforced concrete (TRC)-confined concrete and corroded plain round bars. Design/methodology/approach The bonding performance of three types of specimens (not reinforced, reinforced after corrosion and reinforced before corrosion) was studied by a central pull out test. Findings The ultimate bond strength between the corroded steel bars and the concrete is improved when the corrosion ratio is small. After cracking, the degree of corrosion continues to grow and the ultimate bond strength decreases. TRC reinforcement has no detectable effect on the interfacial bonding properties between concrete and plain round bars when the corrosion of steel bars is small; however, when the concrete cracks under the action of rust corrosion, the TRC constraints can effectively improve the bonding performance of the two components. Practical implications TRC layer significantly delayed the chloride penetration rate, which can effectively limit the development of corrosion cracking.

Factors Affecting Customer Switching Behavior towards Hybrid Electrical Vehicles (HEV’s) from a Customer Perspective in Jordan

2018 ◽  
Vol 1 (3) ◽  
pp. 53
Author(s):  
Bushra Mahadin
Keyword(s):  
Decision Making ◽  
Consumer Behaviour ◽  
New Technologies ◽  
International Marketing ◽  
Current Trend ◽  
Switching Behavior ◽  
Future Research ◽  
Decision Making Process ◽  
Customer Switching ◽  
Electrical Vehicles

Purpose-This paper aims to investigate factors that affect customer switching from Internal Combustion Engine Vehicles (ICEV’s) to Hybrid Electrical Vehicles (HEV’s), in Jordan for the period of (2010-2014).Design/methodology/approach-A self-administered survey was hand-delivered to the targeted sample of car users in Jordan. The authors delivered 400 questionnaires to customers, from which 333 were deemed valid for the analysis, corresponding to the percentage of (83.25%) which indicates the validity of the study. Findings- There was no difference in switching behavior between (ICEV’s) and (HEV’s) based on gender in the Jordanian market. Fuel consumption efficiency was the number one variable that supports the switching behavior towards (HEV's), followed by Eco friendliness, lower taxes and technological features. Price and the current trend in the market were the least supporting factors. In addition to that the perception of the battery life of (HEV's), limited choices in the market, lack of information and fear of the relatively new technology were the major hindering factors of choosing an (HEV).Research limitations-Future research needs to investigate other factors that may affect customers’ behavior such as perceived image, trust, and subjective norms. Future research should investigate into the importance of environmental awareness and new technologies, and gender differences in behavior. From an international marketing standpoint, comparative studies between Jordanian and non-Jordanian customers are potential areas of future research for international marketing strategies and cross-cultural consumer behaviour analysis. Practical implications-The paper identifies the determinants of switching behavior. marketers should focus addressing customers concerns in terms of providing enough information and building awareness towards the technology and it's benefits towards the society and the environment.Originality/value-Our study is one of the few in Jordan that investigates the switching behavior towards vehicles technology. Our study is thought to have made a modest contribution to consumer behaviour literature and, specifically, for decision making process. It offers marketers insights into the determinants of switching behavior towards the hybrid vechicle technology and how this contribute to consumers’ decision making process and attitudes to achieve the intended behavioural outcomes

scholarly journals Phony peach disease: past and present impact on the peach industry in the southeastern U.S.A

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Kendall A. Johnson ◽  
Clive H. Bock ◽  
Phillip M. Brannen
Keyword(s):  
New Technologies ◽  
Current Knowledge ◽  
Future Research ◽  
Management Options ◽  
Disease Epidemiology ◽  
Pathogen Diversity ◽  
Foundational Research ◽  
Global Threat ◽  
And Control ◽  
The Impact

Abstract Background Phony peach disease (PPD) is caused by the plant pathogenic bacterium Xylella fastidiosa subsp. multiplex (Xfm). Historically, the disease has caused severe yield loss in Georgia and elsewhere in the southeastern United States, with millions of PPD trees being removed from peach orchards over the last century. The disease remains a production constraint, and management options are few. Limited research has been conducted on PPD since the 1980s, but the advent of new technologies offers the opportunity for new, foundational research to form a basis for informed management of PPD in the U.S. Furthermore, considering the global threat of Xylella to many plant species, preventing import of Xfm to other regions, particularly where peach is grown, should be considered an important phytosanitary endeavor. Main topics We review PPD, its history and impact on peach production, and the eradication efforts that were conducted for 42 years. Additionally, we review the current knowledge of the pathogen, Xfm, and how that knowledge relates to our understanding of the peach—Xylella pathosystem, including the epidemiology of the disease and consideration of the vectors. Methods used to detect the pathogen in peach are discussed, and ramifications of detection in relation to management and control of PPD are considered. Control options for PPD are limited. Our current knowledge of the pathogen diversity and disease epidemiology are described, and based on this, some potential areas for future research are also considered. Conclusion There is a lack of recent foundational research on PPD and the associated strain of Xfm. More research is needed to reduce the impact of this pathogen on peach production in the southeastern U.S., and, should it spread internationally, wherever peaches are grown.

Bond properties of steel angles in concrete filled steel tubes

2021 ◽  
Vol 182 ◽  
pp. 106653
Author(s):  
Da-wei Zhang ◽  
Yu Zeng ◽  
Ju Chen ◽  
Fuyuan Gong ◽  
Cheng-bin Liu
Keyword(s):  
Bond Properties ◽  
Steel Tubes ◽  
Steel Angles ◽  
Concrete Filled Steel Tubes

Research on High Temperature Anti-Abrasion Protection Technology of Thermocouple Cannula

2007 ◽  
Vol 353-358 ◽  
pp. 1765-1768
Author(s):  
Hong Fei Sun ◽  
Can Ming Wang ◽  
Qiang Song ◽  
Qiong Qiong Yan
Keyword(s):  
High Temperature ◽  
Intermetallic Compound ◽  
Service Life ◽  
New Technologies ◽  
Work Conditions ◽  
Protection Method ◽  
Metal Ceramic ◽  
Protection Technology ◽  
Compound Coating ◽  
Ceramic Compound

Abrasion mechanism of thermocouple cannula is studied in this article. For different working position and condition, different material should be selected to ensure the working characteristics of thermocouple cannula. Several protection methods were introduced to prolong the sevice life of thermocouple cannula. 1. M-Al series intermetallic compound coating protection method. 2. Metal/ceramic compound coating protection method. 3. Development of new abrasion-resisting material for high temperature according to some special work conditions of thermocouple cannula. With the adoption of those new technologies, thermocouple cannula’s service life can be prolonged to 3~5 times of that untreated.

Sign in / Sign up

Export Citation Format

Share Document