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A comparative study of the mechanical properties, fracture behavior, creep, and shrinkage of chemically based self-consolidating concrete

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Frontiers of structural and Civil Engineering 2014年第1期8卷 36-45页

作者： Mahdi AREZOUMANDI Mark EZZELL jeffery s volz Department of Civil Architectural and Environmental Engineering Missouri University of Science and Technology Missouri MO 65409 USA U s Army Corps of Engineers 1222 Spruce St. St. Louis Missouri MO 63103 USA school of Civil Engineering and Environmental science University of Oklahoma Norman OK 73019-1024 USA

This study presents the results of an experimental investigation that compares the mechanical properties, fracture behavior, creep, and shrinkage of a chemically-based self-consolidating concrete （sCC） mix with that of a corresponding conventional concrete （CC） mix. The CC and sCC mix designs followed conventional proportioning in terms of aggregate type and content, cement content, air content, water-cementitiuos materials （w/cm） ratio, and workability. Then, using only chemical admixtures, the authors converted the CC mix to an sCC mix with all of the necessary passing, filling, flowability, and stability requirements typically found in sCC. The high fluidity was achieved with a polycarboxylate-based high-range water-reducing admixture, while the enhanced stability was accomplished with an organic, polymer-based viscosity-modifying admixture. The comparison indicated that the sCC and CC mixes had virtually identical tensile splitting strengths, flexural strengths, creep, and shrinkage. However, the sCC mix showed higher compressive strengths and fracture energies than the corresponding CC mix.

关键词： admixture conventional concrete (CC) creep fracture mechanic mechanical Properties self-consolidatingconcrete (sCC) shrinkage

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A computational platform for considering the effects of aerodynamic and seismic load combination for utility scale horizontal axis wind turbines

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Earthquake Engineering and Engineering Vibration 2016年第1期15卷 91-102页

作者： Mohammad-Amin Asareh Ian Prowell jeffery volz William schonberg Department of Civil Architectural and Environmental Engineering Missouri University of Science and Technology Rolla Mo 65409 USA DNV GL-Renewables San Francisco CA USA school of Civil Engineering and Environmental science University of Oklahoma Norman OK 73019 USA

The wide deployment of wind turbines in locations with high seismic hazard has led engineers to take into account a more comprehensive seismic design of such structures. Turbine specific guidelines usually use simplified methods and consider many assumptions to combine seismic demand with the other operational loads effecting the design of these structures. As the turbines increase in size and capacity, the interaction between seismic loads and aerodynamic loads becomes even more important. In response to the need for a computational tool that can perform coupled simulations of wind and seismic loads, a seismic module is developed for the FAsT code and described in this research. This platform allows engineers working in this industry to directly consider interaction between seismic and other environmental loads for turbines. This paper details the practical application and theory of this platform and provides examples for the use of different capabilities. The platform is then used to show the suitable earthquake and operational load combination with the implicit consideration of aerodynamic damping by estimating appropriate load factors.

关键词： renewable energy horizontal axis wind turbines aerodynamic-seismic load interaction aerodynamicdamping coupled simulations

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