Experimental Study on Effects of Temperature on Characteristic Parameters of CFRP-Confined Concrete Prisms

2010 ◽  
Vol 150-151 ◽  
pp. 1400-1404
Author(s):  
Yan Zhang ◽  
Zhi Sheng Xu
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
Confined Concrete ◽  
Characteristic Parameters ◽  
Concrete Member ◽  
Concrete Prism ◽  
Cfrp Strip ◽  
Effects Of Temperature ◽  
Strain Model ◽  
Strength And Ductility

The stress-strain model of concrete prism after high temperature confined by CFRP is scarce, which gives great trouble to the study of mechanical properties of compressed concrete member after fire strengthened by CFRP. This paper presents the results of an experimental study on effects of temperature on characteristic parameters of CFRP-wrapped concrete prisms at elevated temperature. Experimental results indicate that strength and ductility of CFRP-confined concrete prism after high temperature have a large certain extent increase as the result of the action of CFRP. The results reveal that transitional stress, transitional strain, ultimate stress and ultimate strain are related to width of CFRP strip, the greatest temperature, corner radius and layers of CFRP. This has established reliable foundation for the accurate calculation of concrete structures strengthened by CFRP after high temperature or post fire.

Experimental Study on Concrete Columns with Various Sizes Confined by BFRP and Hybrid FRP under Axial Compression

2013 ◽  
Vol 838-841 ◽  
pp. 407-411 ◽  
Author(s):  
Yue Ling Long ◽  
Jiang Zhu
Keyword(s):  
Experimental Study ◽  
Size Effects ◽  
Peak Stress ◽  
Plain Concrete ◽  
Concrete Columns ◽  
Confined Concrete ◽  
Confining Effect ◽  
Strain Model ◽  
Strength And Ductility ◽  
Better Than

Fourteen concrete columns with various sizes confined by BFRP and hybrid FRP and six plain concrete columns as the control specimens were axially loaded to failure in order to investigate both confining effects and size effects in concrete columns confined by BFRP and hybrid FRP. Experimental results show that BFRP and hybrid FRP can increase considerably both the capacity and ductility of the concrete specimens. Furthermore, the peak stress of the unconfined concrete decreases with the size of the specimens increasing. Similarly, the peak stress of BFRP confined concrete decreases with the size of the specimens increasing when the lateral confining stresses are the same. Hence, both confining effect and size effects should be considered carefully in the stress-strain model of concrete confined by BFRP. In addition, both strength and ductility of concrete confined by hybrid FRP in case of CFRP as inner layers and BFRP as outward layers are better than those in case of BFRP as inner layers and CFRP as outward layers.

Experimental Study on Axially-Loaded Concrete Columns with Various Sizes Confined by CFRP

2013 ◽  
Vol 405-408 ◽  
pp. 706-709 ◽  
Author(s):  
Yue Ling Long ◽  
Jiang Zhu
Keyword(s):  
Experimental Study ◽  
Size Effects ◽  
Peak Stress ◽  
Plain Concrete ◽  
Concrete Columns ◽  
Experimental Results ◽  
Confined Concrete ◽  
Stress Strain ◽  
Axially Loaded ◽  
Strain Model

Eight concrete columns with various sizes confined by CFRP and four plain concrete columns as the control specimens were axially loaded to failure in order to investigate size effects in concrete columns confined by CFRP. Experimental results show that CFRP can increase considerably both the capacity and ductility of the concrete specimens. Furthermore, the peak stress of the unconfined concrete decreases with the size of the specimens increasing. Similarly, the peak stress of confined concrete decreases with the size of the specimens increasing when the lateral confining stresses are the same. Hence, the size effects should be considered in the stress-strain model of concrete confined by CFRP.

COPPER ALLOY No. C46400

Alloy Digest ◽  
1981 ◽  
Vol 30 (3) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Shear Strength ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Fresh Water ◽  
Copper Alloy ◽  
Heat Treating ◽  
Temperature Performance ◽  
Strength And Ductility

Abstract Copper Alloy No. C46400 is a classic marine alloy containing nominally 0.8% tin. It has moderate strength and ductility and excellent resistance to corrosion in both salt and fresh water. It is a widely used marine alloy; its many uses include marine hardware, bolts, nuts, propeller shafts, valve stems and condenser plates. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-414. Producer or source: Copper and copper alloy mills.

ALUMINUM 2017

Alloy Digest ◽  
1974 ◽  
Vol 23 (8) ◽  
Keyword(s):  
Shear Strength ◽  
High Temperature ◽  
Physical Properties ◽  
Heat Treating ◽  
Service Temperature ◽  
Transportation Equipment ◽  
Temperature Performance ◽  
Medium Strength ◽  
Machine Parts ◽  
Strength And Ductility

Abstract ALUMINUM 2017 is an age-hardenable wrought alloy of medium strength and ductility. Its service temperature is below 212 F. It is used for general engineering applications, such as transportation equipment, machine parts and fittings. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fatigue. It also includes information on low and high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Al-58. Producer or source: Various aluminum companies. Originally published October 1957, revised August 1974.

Laboratory Experimental Study on New Polymer in Xinjiang Lukeqin High Temperature and High Salt Reservoir

2018 ◽  
Author(s):  
M. Wang ◽  
Q. Xiao ◽  
Y. Gou ◽  
F. Deng ◽  
B. Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
High Salt

Additive manufacturing of a quasicrystal-forming Al95Fe2Cr2Ti1 alloy with remarkable high-temperature strength and ductility

2021 ◽  
pp. 101960
Author(s):  
Aylanna P.M. de Araujo ◽  
Simon Pauly ◽  
Rodolfo L. Batalha ◽  
Francisco G. Coury ◽  
Claudio S. Kiminami ◽  
...  
Keyword(s):  
High Temperature ◽  
Additive Manufacturing ◽  
High Temperature Strength ◽  
Strength And Ductility

scholarly journals Effects of temperature on the behaviour and metabolism of an intertidal foraminifera and consequences for benthic ecosystem functioning

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Noémie Deldicq ◽  
Dewi Langlet ◽  
Camille Delaeter ◽  
Grégory Beaugrand ◽  
Laurent Seuront ◽  
...  
Keyword(s):  
High Temperature ◽  
Ecosystem Functioning ◽  
Photosynthetic Activity ◽  
Species Traits ◽  
Biogeochemical Cycles ◽  
Variable Environment ◽  
Sediment Reworking ◽  
Temperature Regimes ◽  
Slow Moving ◽  
Effects Of Temperature

AbstractHeatwaves have increased in intensity, duration and frequency over the last decades due to climate change. Intertidal species, living in a highly variable environment, are likely to be exposed to such heatwaves since they can be emerged for more than 6 h during a tidal cycle. Little is known, however, on how temperature affects species traits (e.g. locomotion and behaviour) of slow-moving organisms such as benthic foraminifera (single-celled protists), which abound in marine sediments. Here, we examine how temperature influences motion-behaviour and metabolic traits of the dominant temperate foraminifera Haynesina germanica by exposing individuals to usual (6, 12, 18, 24, 30 °C) and extreme (high; i.e. 32, 34, 36 °C) temperature regimes. Our results show that individuals reduced their activity by up to 80% under high temperature regimes whereas they remained active under the temperatures they usually experience in the field. When exposed to a hyper-thermic stress (i.e. 36 °C), all individuals remained burrowed and the photosynthetic activity of their sequestered chloroplasts significantly decreased. Recovery experiments subsequently revealed that individuals initially exposed to a high thermal regime partially recovered when the hyper-thermic stress ceased. H. germanica contribution to surface sediment reworking substantially diminished from 10 mm3 indiv−1 day−1 (usual temperature) to 0 mm3 indiv−1 day−1 when individuals were exposed to high temperature regimes (i.e. above 32 °C). Given their role in sediment reworking and organic matter remineralisation, our results suggest that heatwaves may have profound long-lasting effects on the functioning of intertidal muddy ecosystems and some key biogeochemical cycles.

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