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., 017200, China 2 Department of Civil Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, China alisanwa@yahoo.com bsunrongguan@126.com Keywords: tunnel, shotcrete lining and rock bolts, strength reduction finite element method, safety coefficient.
Duncan (1996) pointed out that safety coefficient of slope can be defined as the reduction degree of soil materials of shear strength when slope destruction just reached critical state [5].
Acknowledgements Support of the National Natural Science Foundation of China(NSFC) under Contract no.40872172 is gratefully appreciated..
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In the present paper, the behavior of masonry arches strengthened with composite materials is investigated mainly from a numerical standpoint using limit analysis.
Mechanical properties adopted for the constituent materials are summarized in Table 2.
Intrados strengthening of brick masonry arches with composite materials.
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Attention to these materials is expressed, on the one hand, in an increased interest in the fundamental aspects of magnetoelectric phenomena, and, on the other, in expectations of specific practical applications of magnetoelectrics in spin electronics (in particular, as the basis of magnetic memory).
However, the development of new devices and devices for spin electronics based on magnetoelectric effects is faced with a fundamental problem - the number of materials known to date that have a sufficient magnitude of magnetoelectric effects is limited.
The most studied magnetoelectric materials at present are bismuth ferrite BiFeO3 and manganite BaMnF4.
From this point of view, studies of the parameters and properties of the domain structure of garnet-ferrites are a priority for the field of modern materials science, which is engaged in the search and creation of materials for the element base of new-generation spin electronics devices, the principle of which is based on changing the domain configuration of materials under the influence of electric and magnetic fields.
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Depending on the material properties, the laser scanning speed is up to 7 m/s.
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Materials and Methods Materials Sample.
Acknowledgements This work was financially supported by the Funds of Tianjin Agricultural Science and Technology Cooperation Project (0804130), Tianjin Agricultural Science and Technology Achievement Transformation and Extension Project(201002060).
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