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Ductility improvement of GFRP-RC beams using precast confined concrete block in compression zone

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0968-8

Abstract: However, owing to the lack of ductility in this material and the quasi-brittle behavior of concrete,FRP-reinforced concrete (FRP-RC) beams, even with flexural failure, do not fail in a ductile manner.beams depends on the ductility of their compression zones, the present study proposes using a precast confinedconcrete block (PCCB) in the compression zone to improve the ductility of the beams.

Keywords： ductility     four-point bending test     glass fiber-reinforced polymer     precast confined concrete block    

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Axial compression tests and numerical simulation of steel reinforced recycled concrete short columnsconfined by carbon fiber reinforced plastics strips

Hui MA; Fangda LIU; Yanan WU; Xin A; Yanli ZHAO

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 7,   Pages 817-842 doi: 10.1007/s11709-022-0844-y

Abstract: To research the axial compression behavior of steel reinforced recycled concrete (SRRC) short columnsconfined by carbon fiber reinforced plastics (CFRP) strips, nine scaled specimens of SRRC short columnscoarse aggregate (RCA), width of CFRP strips, spacing of CFRP strips and strength of recycled aggregate concreteeffects of RCA, the revised formulas for calculating the axial bearing capacity of SRRC short columns confined

Keywords： steel reinforced recycled concrete     CFRP strips     short columns     axial compression behavior     recycledaggregate concrete    

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Development of deep neural network model to predict the compressive strength of FRCM confined columns

Khuong LE-NGUYEN; Quyen Cao MINH; Afaq AHMAD; Lanh Si HO

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 10,   Pages 1213-1232 doi: 10.1007/s11709-022-0880-7

Abstract: The present study describes a reliability analysis of the strength model for predicting concrete columnsimportant parameters, i.e., section type (circle or square), corner radius rc, unconfined concretedouble hidden layers (APDL-1) was shown to be the best to predict the compressive strength of FRCM confinedFurthermore, the results also reveal that the unconfined compressive strength of concrete, type of fiber

Keywords： FRCM     deep neural networks     confinement effect     strength model     confined concrete    

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Axial compression behavior of CFRP-confined rectangular concrete-filled stainless steel tube stub column

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 5,   Pages 1144-1159 doi: 10.1007/s11709-021-0762-4

Abstract: The mechanical properties of CFRP-confined rectangular concrete-filled stainless steel tube (CFSST) stubproposed based on the twin-shear strength theory, combining the limit equilibrium state of the CFRP-confined

Keywords： CFRP     rectangular CFSST stub column     bearing capacity     limit equilibrium state     twin-shear strength theory    

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Confinement properties of circular concrete columns wrapped with prefabricated textile-reinforced fineconcrete shells

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0955-0

Abstract: This paper proposes an innovative column composed of a core column (including both reinforced concrete(RC) and plain concrete (PC) columns) and a prefabricated textile-reinforced fine concrete (TRC) shellIn the case of TRC-confined PC columns, the maximum improvement in the peak load was 56.3%, and for TRC-confinedanalytical model that can be used to calculate the stress–strain curves of prefabricated TRC shell-confinedconcrete columns has been proposed.

Keywords： textile-reinforced fine concrete     prefabricated shell     confined concrete column     confinement properties    

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Fabrication of bimetallic Cu–Zn adsorbents with high dispersion by using confined space for gas adsorptive

Frontiers of Chemical Science and Engineering   Pages 1623-1631 doi: 10.1007/s11705-022-2202-y

Abstract: Here, we report a simple but efficient strategy for dispersing active components by using a confinedSuch a confined space does not exist in the conventional support, calcined SBA-15, which does not containThe Cu and Zn precursors were introduced to the confined space in the AS and were converted to CuO andConfined space in the AS and the strong interactions caused by the abundant hydroxyl groups are responsible

Keywords： bimetallic adsorbents     confined space     mesoporous silica     propene/propane separation    

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Fabrication of N-doped carbon nanobelts from a polypyrrole tube by confined pyrolysis for supercapacitors

Wei Wang, Haijun Lv, Juan Du, Aibing Chen

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 5,   Pages 1312-1321 doi: 10.1007/s11705-020-2033-7

Abstract: In this present work, N-doped carbon nanobelts (N-CNBs) were prepared by a confined-pyrolysis approachThe silica layer provided a confined space for the Ppy pyrolysis, thereby hindering the rapid overflowAt the same time, the confined environment can activate the carbon shell to create a thin wall and stripThis process of confined pyrolysis realizes self-activation during the pyrolysis of Ppy to obtain the

Keywords： carbon nanobelts     polypyrrole     N-doped     confined pyrolysis     supercapacitor    

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Centrifuge model test and field measurement analysis for foundation pit with confined water

Chunlin DING , Xiaohong MENG ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3,   Pages 299-304 doi: 10.1007/s11709-009-0035-0

Abstract: law of centrifuge test was developed for the seepage field and stress field of a foundation pit with confineddisplacement response of the ground and retaining structure during dewatering and excavation for the pit with confinedwater, which provides a reliable basis for the design and construction of the pit with confined water

Keywords： foundation pit with confined water     centrifuge model test     seepage-stress coupling field     similarity relation    

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Confined masonry as practical seismic construction alternative–the experience from the 2014 Cephalonia

Fillitsa KARANTONI, Stavroula PANTAZOPOULOU, Athanasios GANAS

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 3,   Pages 270-290 doi: 10.1007/s11709-017-0390-1

Abstract: restructuring of the building stock, using a structural system that is most like what is known today as confined

Keywords： Cephalonia     confined masonry     comparative FEM analysis     unreinforced masonry     seismic damage    

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Nano-confined ammonia borane for chemical hydrogen storage

M. A. WAHAB, Huijun ZHAO, X. D. YAO

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 1,   Pages 27-33 doi: 10.1007/s11705-011-1171-3

Abstract: There is a great demand for a sufficient and sustainable energy supply. Hence, the search for applicable hydrogen storage materials is extremely important owing to the diversified merits of hydrogen energy. In this regard, ammonia borane (NH BH , AB) containing 19.6 wt-% hydrogen has been considered as a promising material for hydrogen storage applications to realize the “hydrogen economy”, but with limits from slow kinetics of hydrogen release and by-product of trace gases such as ammonia and borazine. In this review, we introduce the recent research on AB, regarding to the nanoconfinement effect on improving the kinetics at a relatively low temperature and the prevention/reduction of undesirable gas formation.

Keywords： ammonia borane     hydrogen storage    

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Morphologies of diblock copolymer confined in a slit with patterned surfaces studied by dissipative particle

FENG Jian, HUANG Yongmin, LIU Honglai, HU Ying

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 2,   Pages 132-139 doi: 10.1007/s11705-007-0025-5

Abstract: To overcome this disadvantage, the diblock copolymer confined in a restricted system with a patternedIn this work, the morphologies of a thin film of diblock copolymer confined between patterned and neutral

Keywords： weight     nano-fabrication     morphology     matching     dissipative particle    

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Interlayer-confined two-dimensional manganese oxide-carbon nanotube catalytic ozonation membrane for

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 5,   Pages 731-744 doi: 10.1007/s11705-021-2110-6

Abstract: Interlayer space-confined catalysis has been theoretically proven to be a viable strategy for achieving

Keywords： catalytic membrane reactor     catalytic ozonation     nanoconfinement     two-dimensional manganese oxide    

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Ultrafine Fe-modulated Ni nanoparticles embedded within nitrogen-doped carbon from Zr-MOFs-confined conversion

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 7,   Pages 1114-1124 doi: 10.1007/s11705-021-2087-1

Abstract: Improvement of the low-cost transition metal electrocatalyst used in sluggish oxygen evolution reaction is a significant but challenging problem. In this study, ultrafine Fe-modulated Ni nanoparticles embedded in a porous Ni-doped carbon matrix were produced by the pyrolysis of zirconium metal-organic-frameworks, in which 2,2′-bipyridine-5,5′-dicarboxylate operating as a ligand can coordinate with Ni2+ and Fe3+. This strategy allows formation of Fe-modulated Ni nanoparticles with a uniform dimension of about 2 nm which can be ascribed to the spatial blocking effect of ZrO2. This unique catalyst displays an efficient oxygen evolution reaction electrocatalytic activity with a low overpotential of 372 mV at 10 mA·cm–2 and a small Tafel slope of 84.4 mV·dec–1 in alkaline media. More importantly, it shows superior durability and structural stability after 43 h in a chronoamperometry test. Meanwhile, it shows excellent cycling stability during 4000 cyclic voltammetry cycles. This research offers a new insight into the construction of uniform nanoscale transition metals and their alloys as highly efficient and durable electrocatalysts.

Keywords： metal-organic framework     pyrolysis     ultrafine     Fe-modulated Ni nanoparticles     oxygen evolution reaction    

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Slender reinforced concrete shear walls with high-strength concrete boundary elements

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 1,   Pages 138-151 doi: 10.1007/s11709-022-0897-y

Abstract: Reinforced concrete structural walls are commonly used for resisting lateral forces in buildings.Owing to the advancements in the field of concrete materials over the past few decades, concrete mixesof high compressive strength, commonly referred to as high-strength concrete (HSC), have been developedThe finite-element model of a conventional normal-strength concrete (NSC) prototype wall was validatedCold joints resulting from dissimilar concrete pours in the web and boundary elements of the HSC wall

Keywords： slender walls     high-strength concrete     rectangular and barbell-shaped walls     cold joints    

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Stability of three-dimensional printable foam concrete as function of surfactant characteristics

Frontiers of Structural and Civil Engineering   Pages 935-947 doi: 10.1007/s11709-023-0964-z

Abstract: Extrudability is one of the most critical factors when designing three-dimensional printable foam concretethe foam stability which necessitates the investigation into surfactant properties particularly for concreteprinted foam concrete are scarce.characteristics on the stability, extrudability, and buildability of three-dimensional printed foam concreteUnlike traditional foam concrete, the variation in the stabilizer concentration and density of concrete

Keywords： foam concrete     3D printable concrete     stability     rheology     air void microstructure    

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Title Author Date Type Operation

Ductility improvement of GFRP-RC beams using precast confined concrete block in compression zone

Journal Article

Axial compression tests and numerical simulation of steel reinforced recycled concrete short columnsconfined by carbon fiber reinforced plastics strips

Hui MA; Fangda LIU; Yanan WU; Xin A; Yanli ZHAO

Journal Article

Development of deep neural network model to predict the compressive strength of FRCM confined columns

Khuong LE-NGUYEN; Quyen Cao MINH; Afaq AHMAD; Lanh Si HO

Journal Article

Axial compression behavior of CFRP-confined rectangular concrete-filled stainless steel tube stub column

Journal Article

Confinement properties of circular concrete columns wrapped with prefabricated textile-reinforced fineconcrete shells

Journal Article

Fabrication of bimetallic Cu–Zn adsorbents with high dispersion by using confined space for gas adsorptive

Journal Article

Fabrication of N-doped carbon nanobelts from a polypyrrole tube by confined pyrolysis for supercapacitors

Wei Wang, Haijun Lv, Juan Du, Aibing Chen

Journal Article

Centrifuge model test and field measurement analysis for foundation pit with confined water

Chunlin DING , Xiaohong MENG ,

Journal Article

Confined masonry as practical seismic construction alternative–the experience from the 2014 Cephalonia

Fillitsa KARANTONI, Stavroula PANTAZOPOULOU, Athanasios GANAS

Journal Article

Nano-confined ammonia borane for chemical hydrogen storage

M. A. WAHAB, Huijun ZHAO, X. D. YAO

Journal Article

Morphologies of diblock copolymer confined in a slit with patterned surfaces studied by dissipative particle

FENG Jian, HUANG Yongmin, LIU Honglai, HU Ying

Journal Article

Interlayer-confined two-dimensional manganese oxide-carbon nanotube catalytic ozonation membrane for

Journal Article

Ultrafine Fe-modulated Ni nanoparticles embedded within nitrogen-doped carbon from Zr-MOFs-confined conversion

Journal Article

Slender reinforced concrete shear walls with high-strength concrete boundary elements

Journal Article

Stability of three-dimensional printable foam concrete as function of surfactant characteristics

Journal Article