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The effect of carbon nanotubes and polypropylene fibers on bond of reinforcing bars in strain resilientcementitious composites

Souzana P. TASTANI,Maria S. KONSTA-GDOUTOS,Stavroula J. PANTAZOPOULOU,Victor BALOPOULOS

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 2,   Pages 214-223 doi: 10.1007/s11709-016-0332-3

Abstract: In the tests, the matrix comprises a novel, strain resilient cementitious composite (SRCC) reinforcedAccompanying tests used to characterize the cementitious material were also conducted.The local bond response curves thus obtained were marked by a resilient appearance exhibiting sustained

Keywords： carbon nanotubes     strain resilient cementitious composite     polypropylene fibers     tensile bending     bond    

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Strengthening of the concrete face slabs of dams using sprayable strain-hardening fiber-reinforced cementitious

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 2,   Pages 145-160 doi: 10.1007/s11709-022-0806-4

Abstract: In this study, sprayable strain-hardening fiber-reinforced cementitious composites (FRCC) were appliedThe findings of this study indicate that the sprayable strain-hardening FRCC has a good potential for

Keywords： strain-hardening cementitious composites     engineered cementitious composites     sprayable     shotcrete     strengthening    

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Performance of soft-hard-soft (SHS) cement based composite subjected to blast loading with consideration

Jun WU,Xuemei LIU

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 3,   Pages 323-340 doi: 10.1007/s11709-015-0301-2

Abstract: and numerical study on the damage and performance of a soft-hard-soft (SHS) multi-layer cement based compositeincluding asphalt concrete (AC) on the top, high strength concrete (HSC) in the middle, and engineered cementitiousStrain rate effects of the asphalt concrete were also studied and both compressive and tensile dynamicA full-scale field blast test investigated the blast behavior of the composite materials.The numerical model was established by taking into account the strain rate effect of all concrete materials

Keywords： high strength concrete (SHS)     engineered cementitious composite     interface     blast test     strain rate effect    

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Pore structure of cementitious material enhanced by graphitic nanomaterial: a critical review

S.A. GHAHARI, E. GHAFARI, L. ASSI

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 1,   Pages 137-147 doi: 10.1007/s11709-017-0431-9

Abstract: The effect of CNT on the microstructures of cementitious materials has been widely reported.This paper combines a critical review on the effect of CNT on the pore and microstructure of cement compositethis review paper involves analyzing the effect of CNT on the microstructure and the pore structure of cementitiousThe existing methods of measuring the porosity of cementitious material are reviewed, in particular,

Keywords： carbon nano tubes     microstructure     porosity     mercury intrusion porosimetry     cement composite    

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Experimental study on flexural behavior of ECC/RC composite beams with U-shaped ECC permanent formwork

Zhi QIAO, Zuanfeng PAN, Weichen XUE, Shaoping MENG

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 5,   Pages 1271-1287 doi: 10.1007/s11709-019-0556-0

Abstract: To enhance the durability of a reinforced concrete structure, engineered cementitious composite (ECC)This paper presents a new means to address this issue by introducing a composite beam with a U-shapedThe flexural performance of the ECC/RC composite beam has been investigated experimentally with eightAccording to the test results, the failure of a composite beam with a U-shaped ECC formwork is initiatedUnder the same reinforcement configurations, ECC/RC composite beams exhibit increases in flexural performance

Keywords： engineered cementitious composite (ECC)     durability     ECC/RC composite beam     permanent formwork     flexural    

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Inner strain determination of three-dimensional braided preforms with co-braided optical fiber sensors

LI Xianghua, LIU Xiaohui, YUAN Shenfang

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 416-420 doi: 10.1007/s11465-008-0062-x

Abstract: This paper discusses two techniques to incorporate different OFSs into 3-D braided composite preformsStrain curves of various OFSs tests are finally compared, and they all exhibit good linearity.

Keywords： different     experimental characterization     three-dimensional     composite     micro-bend    

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Effect of natural pozzolan content on the properties of engineered cementitious composites as repair

Said CHOUCHA, Amar BENYAHIA, Mohamed GHRICI, Mohamed Said MANSOUR

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 3,   Pages 261-269 doi: 10.1007/s11709-017-0394-x

Abstract: Natural Pozzolan (NP) content on the mechanical properties and durability characteristics on Engineered Cementitious

Keywords： natural pozzolan     engineered cementitious composites     mechanical strengths     elastic modulus     capillary absorption    

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reducing admixtures having different action mechanisms on mechanical and durability performance of cementitious

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 5,   Pages 1277-1291 doi: 10.1007/s11709-021-1752-2

Abstract: permeability reducing admixture (PRA) having different action mechanisms on hardened state properties of cementitiousMortar mixes with binary and ternary cementitious systems were prepared by partially replacing cement

Keywords： cementitious system     mineral additive     permeability reducing admixture     mechanical properties     durability    

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Computational studies on the seismic response of the State Route 99 bridge in Seattle with SMA/ECC plastic hinges

Jiping GE, M. Saiid SAIIDI, Sebastian VARELA

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 1,   Pages 149-164 doi: 10.1007/s11709-018-0482-6

Abstract: the first full-scale highway bridge to use superelastic shape memory alloy bars (SMA) and engineered cementitiouscomposite (ECC) to mitigate column plastic hinge damage and minimize residual displacements after a

Keywords： seismic design     analytical simulation     near-fault earthquakes     shape memory alloy     engineered cementitiouscomposite     self-centering    

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Strengthening of reinforced concrete beams using fiber-reinforced cementitious matrix systems fabricated

Frontiers of Structural and Civil Engineering   Pages 1100-1116 doi: 10.1007/s11709-023-0967-9

Abstract: The performance of a new fiber-reinforced cementitious matrix (FRCM) system developed using custom-designed

Keywords： fiber-reinforced cementitious matrix     flexural strengthening     shear strengthening     carbon fiber-reinforced    

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BUILDING CLIMATE-RESILIENT FOOD SYSTEMS IN EAST AND SOUTHEAST ASIA: VULNERABILITIES, RESPONSES AND FINANCING

Frontiers of Agricultural Science and Engineering 2023, Volume 10, Issue 1,   Pages 16-30 doi: 10.15302/J-FASE-2023492

Abstract:

● Food systems in East and Southeast Asia are vulnerable to global warming.

Keywords： food systems     climate change     East     policy     resilience and Southeast Asia    

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Performance assessment of innovative seismic resilient steel knee braced frame

Tony T. Y. YANG,Yuanjie LI

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 3,   Pages 291-302 doi: 10.1007/s11709-016-0340-3

Abstract: Buckling restrained knee braced truss moment frame (BRKBTMF) is a novel and innovative steel structural system that utilizes the advantages of long-span trusses and dedicated structural fuses for seismic applications. Steel trusses are very economical and effective in spanning large distance. However, conventional steel trusses are typically not suitable for seismic application, due to its lack of ductility and poor energy dissipation capacity. BRKBTMF utilizes buckling restrained braces (BRBs) as the designated structural fuses to dissipate the sudden surge of earthquake energy. This allows the BRKBTMF to economically and efficiently create large span structural systems for seismic applications. In this paper, a prototype BRKBTMF office building located in Berkeley, California, USA, was designed using performance-based plastic design procedure. The seismic performance of the prototype building was assessed using the state-of-the-art finite element software, OpenSees. Detailed BRB hysteresis and advanced element removal technique was implemented. The modeling approach allows the simulation for the force-deformation response of the BRB and the force redistribution within the system after the BRBs fracture. The developed finite element model was analyzed using incremental dynamic analysis approach to quantify the seismic performance of BRKBTMF. The results show BRKBTMF has excellent seismic performance with well controlled structural responses and resistance against collapse. In addition, life cycle repair cost of BRKBTMF was assessed using the next-generation performance-based earthquake engineering framework. The results confirm that BRKBTMF can effectively control the structural and non-structural component damages and minimize the repair costs of the structure under different ranges of earthquake shaking intensities. This studies conclude that BRKBTMF is a viable and effective seismic force resisting system.

Keywords： buckling restrained brace     innovative structural system     collapse simulation     seismic assessment    

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Urban constructed wetlands: Assessing ecosystem services and disservices for safe, resilient, and sustainable

Frontiers of Engineering Management   Pages 582-596 doi: 10.1007/s42524-023-0268-y

Abstract: Climate change and rapid urbanization are pressing environmental and social concerns, with approximately 56% of the global population living in urban areas. This number is expected to rise to 68% by 2050, leading to the expansion of cities and encroachment upon natural areas, including wetlands, causing their degradation and fragmentation. To mitigate these challenges, green and blue infrastructures (GBIs), such as constructed wetlands, have been proposed to emulate and replace the functions of natural wetlands. This study evaluates the potential of eight constructed wetlands near Beijing, China, focusing on their ecosystem services (ESs), cost savings related to human health, growing/maintenance expenses, and disservices using an emergy-based assessment procedure. The results indicate that all constructed wetlands effectively purify wastewater, reducing nutrient concentrations (e.g., total nitrogen, total phosphorus, and total suspended solids). Among the studied wetlands, the integrated vertical subsurface flow constructed wetland (CW-4) demonstrates the highest wastewater purification capability (1.63E+14 sej/m2/yr) compared to other types (6.78E+13 and 2.08E+13 sej/m2/yr). Additionally, constructed wetlands contribute to flood mitigation, groundwater recharge, wildlife habitat protection, and carbon sequestration, resembling the functions of natural wetlands. However, the implementation of constructed wetlands in cities is not without challenges, including greenhouse gas emissions, green waste management, mosquito issues, and disturbances in the surrounding urban areas, negatively impacting residents. The ternary phase diagram reveals that all constructed wetlands provide more benefits than costs and impacts. CW-4 shows the highest benefit‒cost ratio, reaching 50%, while free water surface constructed wetland (CW-3) exhibits the lowest benefits (approximately 38%), higher impacts (approximately 25%), and lower costs (approximately 37%) compared to other wetlands. The study advocates the use of an emergy approach as a reliable method to assess the quality of constructed wetlands, providing valuable insights for policymakers in selecting suitable constructed wetlands for effective urban ecological management.

Keywords： constructed wetland     emergy     ecosystem services     disservices     ternary diagram    

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Modeling of the resilient supply chain system from a perspective of production design changes

Frontiers of Engineering Management   Pages 96-106 doi: 10.1007/s42524-022-0235-z

Abstract: Building an effective resilient supply chain system (RSCS) is critical and necessary to reduce the risk

Keywords： resilient supply chain     supply chain disruption     domain modeling     product design changes    

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Sustainable High-Performance Resilient Structures

Hong Hao, Jun Li

Engineering 2019, Volume 5, Issue 2,   Pages 197-198 doi: 10.1016/j.eng.2019.02.001

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Title Author Date Type Operation

The effect of carbon nanotubes and polypropylene fibers on bond of reinforcing bars in strain resilientcementitious composites

Souzana P. TASTANI,Maria S. KONSTA-GDOUTOS,Stavroula J. PANTAZOPOULOU,Victor BALOPOULOS

Journal Article

Strengthening of the concrete face slabs of dams using sprayable strain-hardening fiber-reinforced cementitious

Journal Article

Performance of soft-hard-soft (SHS) cement based composite subjected to blast loading with consideration

Jun WU,Xuemei LIU

Journal Article

Pore structure of cementitious material enhanced by graphitic nanomaterial: a critical review

S.A. GHAHARI, E. GHAFARI, L. ASSI

Journal Article

Experimental study on flexural behavior of ECC/RC composite beams with U-shaped ECC permanent formwork

Zhi QIAO, Zuanfeng PAN, Weichen XUE, Shaoping MENG

Journal Article

Inner strain determination of three-dimensional braided preforms with co-braided optical fiber sensors

LI Xianghua, LIU Xiaohui, YUAN Shenfang

Journal Article

Effect of natural pozzolan content on the properties of engineered cementitious composites as repair

Said CHOUCHA, Amar BENYAHIA, Mohamed GHRICI, Mohamed Said MANSOUR

Journal Article

reducing admixtures having different action mechanisms on mechanical and durability performance of cementitious

Journal Article

Computational studies on the seismic response of the State Route 99 bridge in Seattle with SMA/ECC plastic hinges

Jiping GE, M. Saiid SAIIDI, Sebastian VARELA

Journal Article

Strengthening of reinforced concrete beams using fiber-reinforced cementitious matrix systems fabricated

Journal Article

BUILDING CLIMATE-RESILIENT FOOD SYSTEMS IN EAST AND SOUTHEAST ASIA: VULNERABILITIES, RESPONSES AND FINANCING

Journal Article

Performance assessment of innovative seismic resilient steel knee braced frame

Tony T. Y. YANG,Yuanjie LI

Journal Article

Urban constructed wetlands: Assessing ecosystem services and disservices for safe, resilient, and sustainable

Journal Article

Modeling of the resilient supply chain system from a perspective of production design changes

Journal Article

Sustainable High-Performance Resilient Structures

Hong Hao, Jun Li

Journal Article