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The effect of dilution on the aggregation of polycarboxylated C60 fullerene nanoparticles
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공간 전압벡터 PWM의 SIMULINK 시뮬레이션
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한국 근현대불교의 태동과 擎雲 元奇
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특성화고등학교의 공공공간 계획방향 연구
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Equivalent Convective Heat Transfer Coefficient for Boundary Conditions in Temperature Prediction of Early-Age Concrete Elements Using FD and PSO
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- 저자 : Yen Lei Voo (검색결과 3 건)
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Behzad Nematollahi,Yen Lei Voo,Raizal Saifulnaz M. R. 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.5
Ultra-high Performance Fiber Reinforced Concrete (UHPFRC) is a new generation of cementitious based construction materialdeveloped in the mid 1990s that its unique characteristics such as high durability and impermeability, negligible shrinkage/creep andhigh impact resistance lead to almost maintenance free and direct enhancement of the life-span of a structure. UHPFRC is an ecofriendlyand environmentally green construction material which has the capacity to compete not only with conventional ReinforcedConcrete (RC) or prestressed concrete design, but it is also able to compete with conventional steel design. This paper is presented intwo parts. The first part (Part I) of this paper presents the analysis and design procedures of the precast UHPFRC cantilever retainingwalls as a sustainable alternative approach to conventional precast RC cantilever retaining walls. Further, the Environmental ImpactCalculations (EIC) of the precast UHPFRC cantilever retaining walls were compared against the conventional precast RC cantileverretaining walls as the benchmark. The second part (Part II) of this paper evaluates the reliability of the precast UHPFRC cantileverretaining walls through experimental tests on full scale UHPFRC wall specimens. The EIC results proved that cantilever retainingwalls fabricated from UHPFRC are generally more environmentally sustainable than those built of the conventional RC with respectto the reduction of CO2 emissions, Embodied Energy (EE) and Global Warming Potential (GWP). Finally, advantages of the precastUHPFRC cantilever retaining walls versus the conventional precast RC walls were presented.
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Simplified Constitutive and Damage Plasticity Models for UHPFRC with Different Types of Fiber
Doaa Talib Hashim,Farzad Hejazi,Voo Yen Lei 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.5
In this study, several simplified constitutive models and a damage plasticity model for ultra-high performance fiber reinforced concrete(UHPFRC)material with micro and hooked ends steel fibers, Bekaert Dramix 5D steel fiber, and Forta-Ferro synthetic fiber had been developed. Later, these constitutive and damage plasticity models were applied as analytical model to numerically simulate the concrete members with different fibers, and to evaluate the behavior of the concrete sections. The constitutive models for UHPFRC of three mix designs were obtained experimentally by conducting uniaxial compression and tensile tests on both cylinder and dog-bone specimens. Next, a comparison was made among the three mix designs based on the outcomes retrieved from uniaxial compression and tensile stress–strain. These results were validated by numerically analyzing three hollow circular columns via finite element method. The numerical results revealed that the proposed material model possessed appropriate tensile strainhardening behavior and uniaxial compression strengths of UHPFRC with different types of fiber. The lateral resistance responses of the tested hollow sections, which were obtained by using developed constitutive and damage plasticity models, displayed exceptional agreement with the experimental outcomes.
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Mohammad Panjehpour,Abang Abdullah Abang Ali,Yen Lei Voo,Farah Nora Aznieta 사단법인 한국계산역학회 2014 Computers and Concrete, An International Journal Vol.13 No.1
Strut-and-tie model (STM) has been recommended by many codes and standards as a rationalmodel for discontinuity regions in structural members. STM has been adopted in ACI building code foranalysis of reinforced concrete (RC) deep beams since 2002. However, STM recommended by ACI 318-11is only applicable for analysis of ordinary RC deep beams. This paper aims to develop the STM for CFRPstrengthened RC deep beams through the strut effectiveness factor recommended by ACI 318-11. Two setsof RC deep beams were cast and tested in this research. Each set consisted of six simply-supportedspecimens loaded in four-point bending. The first set had no CFRP strengthening while the second wasstrengthened by means of CFRP sheets using two-side wet lay-up system. Each set consisted of six RC deepbeams with shear span to effective depth ratio of 0.75, 1.00, 1.25, 1.50, 1.75, and 2.00.The value of struteffectiveness factor recommended by ACI 318-11 is modified using a proposed empirical relationship in thisresearch. The empirical relationship is established based on shear span to effective depth ratio.
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