Multi-axial test and failure criterion analysis on self-compacting lightweight aggregate concrete
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Stress–strain curve
In this paper,the preparation technique of recycled aggregate is introduced,the production process of recycled aggregate is hereby proposed and the performance of recycled aggregate and recycled concrete are furthermore studied.By means of advanced process,high performance recycled aggregate satisfies the requirements from the codeRecycled coarse aggregate for concrete(GB/T 25177-2001) and Recycled fine aggregate for concrete and mortar(GB/T 25176-2001).Additionally,the corresponding recycled concrete has been applied in the construction and suffices for the structural engineering.
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A nanoindentation technique with a spherical indenter of tip radius 10 μm is applied to the evaluation of stress-strain curve at a local area of a pure iron under the uniaxial compressive stress exerted through the iron, and the influence of the compressive stress on the estimated stress-strain curve has been examined. A continuous multiple loading method is employed to determine the stress-strain curve. In the method, a set of 21 times of loading/unloading sequences with increasing terminal load are made and load-displacement curves with the different terminal loads from 0.1 mN to 100 mN are then continuously obtained and converted to a stress-strain curve. To examine the stress dependence of the stress-strain curve, the estimation by the nanoindentetion is performed under different uniaxial compressive stresses up to 250 MPa. It has been found that the stress-strain curve determined by the nanoindentation shifts upward as the compressive stress increases and the quantity of the shift is almost equal to the uniaxial stress acting on the iron specimen. It is also noted that the yield stress (0.2 % proof stress) estimated from the stress-strain curve increases almost proportionally to the uniaxial stress and the increase ratio tends to decrease as the stress reaches around 200 MPa.
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In this paper the complete stress-strain curves of recycled aggregate concrete with different recycled coarse aggregate replacement percentages are carried out,and the influences of varying recycled coarse aggregate contents on the complete stress-strain curve,peak stress,peak strain and elastic modulus are analyzed.The results show that the stress-strain curves of recycled aggregate concrete are similar to those of the conventional concrete,however,in terms of the recycled aggregate concrete,the peak strain is higher,and the elastic modulus is lower than those of the ordinary concrete.
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Spatiotemporal databases are becoming increasingly more common. Typically, applications modeling spatiotemporal objects need to process vast amounts of data. In such cases, generating aggregate information from the data set is more useful than individually analyzing every entry. In this paper, we study the most relevant techniques for the evaluation of aggregate queries on spatial, temporal, and spatiotemporal data. We also present a model that reduces the evaluation of aggregate queries to the problem of selecting qualifying tuples and the grouping of these tuples into collections on which an aggregate function is to be applied. This model gives us a framework that allows us to analyze and compare the different existing techniques for the evaluation of aggregate queries. At the same time, it allows us to identify opportunities for research on types of aggregate queries that have not been studied.
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The article offers the finite element meshing algorithm for calculating the stress-strain behavior of various structures with stress-raisers. The advantages of the developed algorithm over the algorithm realized in ANSYS are shown.
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Disaggregate models –defined here as models using observations at the level of the traveler, the traveling group, the business establishment or the shipmenthave several advantages over aggregate models (which use groupings of those units as observations, e.g., groupings by geographic zone). Disaggregate models can be based on a foundation in behavioral theory, can include more detailed policy-relevant variables and do not suffer from the aggregation biases of aggregate models. Nevertheless, there are perfectly valid reasons why some of the components of a model system are modeled in an aggregate fashion. In this paper, we propose an ‘aggregate-disaggregate-aggregate’ (ADA) model system for freight transport.
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