Recyclable LRS FRP composites for engineering structures: Current status and future opportunities

2021 ◽  
Vol 212 ◽  
pp. 108689 ◽  
Author(s):  
Yu-Yi Ye ◽  
Sheng-Da Liang ◽  
Peng Feng ◽  
Jun-Jie Zeng
Keyword(s):  
Current Status ◽  
Engineering Structures ◽  
Frp Composites

Study and Application of Health Monitoring by Fiber Optic Sensors in Civil Engineering

2003 ◽  
Author(s):  
Hong-Nan Li ◽  
Dong-Sheng Li ◽  
Su-Yan Wang
Keyword(s):  
Health Monitoring ◽  
Fiber Optic ◽  
Civil Engineering ◽  
Fiber Optic Sensor ◽  
Current Status ◽  
Fibre Optic ◽  
Engineering Structures ◽  
Monitoring Method ◽  
Structural Health ◽  
Potential Damage

In civil engineering, the smart health monitoring method by use of fiber optic sensor is a new approach that evaluates the structural health situation. The current status in applications of fibre optic structural health monitoring in civil engineering structures with a brief introduction of the advantages, basic principles of fibre optic sensors is described in this paper. Leakage detection and potential damage to pipelines are emphasized. Finally, existing problems for packing and implementing fibre optic sensors in structures are discussed.

Behavior of CFRP Wrapped Concrete Columns with Partial Deteriorated Strength

2008 ◽  
Vol 47-50 ◽  
pp. 1282-1285 ◽  
Author(s):  
Hua Wei ◽  
Ji Sheng Li ◽  
Xia Guo
Keyword(s):  
Load Capacity ◽  
Concrete Columns ◽  
Frost Damage ◽  
Engineering Structures ◽  
Cfrp Sheets ◽  
Concrete Deterioration ◽  
Frp Composites ◽  
Reinforced Polymer ◽  
Partial Confinement ◽  
Transverse Strains

Fiber reinforced polymer (FRP) composites are becoming more frequently used in civil engineering structures because of their superiors advantages. While in practice, partial deterioration of concrete columns occurs occasionally, frost damage, aging or construction quality might lead to concrete deterioration. However, confined the whole columns including intact and deteriorated parts has been regarded as a waste. Few literatures have involved in partial confinement only to defect parts. The objective of this paper is to present an effective method to deal with the partial deteriorated strength columns, and to gain insight into the mechanical behavior of the defect part. Five groups of plain square columns are cast, different layers of CFRP sheets have been wrapped just on the deteriorated part to investigate the improvement with CFRP sheets and to verify the practicability of partial confinement. Columns are subjected to monotonic axial compression until failure occurs. Axial load, axial and transverse strains are measured to compare the different behaviors and to evaluate confinement level supplied by CFRP sheets. Experimental results show that partial confinement with CFRP can significantly enhance the strength and the ductility of the deteriorated strength part, then, the load capacity of the entire column can be improved subsequently.

A model specification for FRP composites for civil engineering structures

2003 ◽  
Vol 17 (6-7) ◽  
pp. 405-437 ◽  
Author(s):  
Lawrence C Bank ◽  
T.Russell Gentry ◽  
Benjamin P Thompson ◽  
Jeffrey S Russell
Keyword(s):  
Civil Engineering ◽  
Model Specification ◽  
Engineering Structures ◽  
Frp Composites ◽  
Civil Engineering Structures

Sustainability of Fiber Reinforced Composites: Status and Vision for Future

2011 ◽  
Author(s):  
Devi K. Kalla ◽  
P. S. Dhanasekaran ◽  
Bangwei Zhang ◽  
Ramazan Asmatulu
Keyword(s):  
Raw Materials ◽  
Low Cost ◽  
Environmental Benefits ◽  
Current Status ◽  
Fiber Reinforced ◽  
Frp Composites ◽  
Frp Composite ◽  
Manufacturing Techniques ◽  
Sustainability Problems ◽  
Future Vision

Fiber reinforced polymer (FRP) composite products offer many significant environmental benefits such as light weight, superior mechanical properties, extended service life, low maintenance and resistance to corrosion. But until now it has been difficult to compare sustainability of different FRP materials and production for processes. Concern for the environment, both in terms of limiting the use of finite resources and the need to manage waste disposal, has led to increasing pressure to recycle materials. This paper focuses on two issues that must be addressed to ensure continued growth in FRP usage is the disposal of waste generated during product manufacturing and the disposal of the products at the end of their useful life. The major cost drivers for FRPs are labor and raw materials. The use of recycled FRPS offers low-cost raw materials. This paper presents a review of the current status and outlook of FRP composites recycling and re-manufacturing techniques. A future vision for the use of FRP composites with sustainability applications is underway at many university research institutes and in industries. This paper will also state the sustainability problems of fiber reinforced composite products, and potential solutions.

scholarly journals Dynamic response of masonry minarets strengthened with Fiber Reinforced Polymer (FRP) composites

2011 ◽  
Vol 11 (7) ◽  
pp. 2011-2019 ◽  
Author(s):  
A. C. Altunişik
Keyword(s):  
Dynamic Response ◽  
Cylindrical Body ◽  
Element Model ◽  
Dynamic Responses ◽  
Principal Stresses ◽  
Engineering Structures ◽  
Frp Composites ◽  
Frp Composite ◽  
Before And After ◽  
Historical Masonry

Abstract. Engineering structures strengthened with FRP composites are gaining popularity, and there is a growing need to understand and compare the behavior of these structures before/after FRP composite strengthening. In this paper, it is aimed to determine the dynamic response of masonry minarets before/after FRP composite strengthening. An Iskenderpaşa historical masonry minaret dating back to XVI century with a height of 21 m located in Trabzon, Turkey was selected as an application. Firstly, 3-D finite element model of the minaret was constituted using ANSYS software. Then, an analytical model of the minaret was analyzed using the 1992 Erzincan earthquake record, which occurred near the area, to determine the dynamic behavior. After this, the cylindrical body of the minaret was strengthened with FRP composite using different configurations and dynamic analyses were performed. Finally, dynamic responses of the minaret before and after FRP composite strengthening, such as displacements and maximum-minimum principal stresses, were compared. At the end of the study, it is seen that displacements had increased along the height of the minaret, maximum and minimum principal stresses occur at the region of transition segment and cylindrical body for all analyses. Also, it is seen from the earthquake analyses that FRP strengthening is very effective on the dynamic responses of the minaret.

Present Status and Future Problems on the Impact Resistance Performance Design of Civil Engineering Protective Structures

2014 ◽  
Vol 566 ◽  
pp. 10-25 ◽  
Author(s):  
Yoshimi Sonoda
Keyword(s):  
Civil Engineering ◽  
Impact Resistance ◽  
Design Methods ◽  
Current Status ◽  
Research Committee ◽  
Engineering Structures ◽  
Design Concepts ◽  
Protective Structures ◽  
Resistance Performance ◽  
The Impact

There are many civil engineering structures that have different systems and required functions. Their design methods do not have consistent design concepts. Thus, it has been pointed out the necessity of universal concepts on assumed external actions and risk for various structures and on the required level of safety. In order to meet those demands, a research committee as part of Japan Society of Civil Engineers summarizing the basic concepts of impact resistance design. This paper introduces several design methods of structures subjected to impact loads, and presents the current status and remaining issues of establishing new performance-based design methods.

Current status of special planetary and lunar theories and ephemerides

1966 ◽  
Vol 25 ◽  
pp. 266-267
Author(s):  
R. L. Duncombe
Keyword(s):  
Observational Data ◽  
Current Status ◽  
Numerical Errors

An examination of some specialized lunar and planetary ephemerides has revealed inconsistencies in the adopted planetary masses, the presence of non-gravitational terms, and some outright numerical errors. They should be considered of temporary usefulness only, subject to subsequent amendment as required for the interpretation of observational data.

Current Status of Solid-State X-Ray Systems

1985 ◽  
Vol 43 ◽  
pp. 158-161
Author(s):  
Martin Peckerar ◽  
Anastasios Tousimis
Keyword(s):  
Solid State ◽  
Electric Fields ◽  
Spectral Lines ◽  
Current Status ◽  
Mobile Charge ◽  
Electron Hole ◽  
X Ray ◽  
Sensing Systems ◽  
Transmission Electron ◽  
Electron Microscopes

Solid state x-ray sensing systems have been used for many years in conjunction with scanning and transmission electron microscopes. Such systems conveniently provide users with elemental area maps and quantitative chemical analyses of samples. Improvements on these tools are currently sought in the following areas: sensitivity at longer and shorter x-ray wavelengths and minimization of noise-broadening of spectral lines. In this paper, we review basic limitations and recent advances in each of these areas. Throughout the review, we emphasize the systems nature of the problem. That is. limitations exist not only in the sensor elements but also in the preamplifier/amplifier chain and in the interfaces between these components.Solid state x-ray sensors usually function by way of incident photons creating electron-hole pairs in semiconductor material. This radiation-produced mobile charge is swept into external circuitry by electric fields in the semiconductor bulk.

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