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Besides, both bearing capacity and ductility of STCSRC have been improved by giving fully play to the two kinds of mechanical properties of materials.
Table 1 Mechanical properties of materials Materials Poisson ratio Elastic modulus/MPa Fy/MPa Concrete (C50) 0.2 34.5 Concrete (C80) 0.2 38.0 Steel tube 0.3 206 292 Angle steel 0.3 206 342 Hoops 0.3 210 342 Selection of units Unit of concrete is simulated by SOLID65.Unit of hoops is simulated by LINK8.Units of steel and angle steel are simulated by SHELL181.Unit of cover plate is simulated by SOLID45.
Diagram shows that stress intensity has much more than a single central core of concrete under axial pressure limit.Description in STCSRC: all materials can work together very well,give fully play to the performance of materials and increase bearing capacity.
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The two materials with different mechanical properties are combined and act jointly as a kind of building material.
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Acknowledgements This work is supported by the Beijing Municipal Education Commission under the Project Number KM201110005014, and the Beijing Natural Science Foundation under the Project Number 1113015, which are gratefully acknowledged.
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Acknowledgement This work was financially supported by the National Natural Science Foundation (50678173).
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Acknowledgements This work is supported by the National Natural Science Foundation of China (Grant No. 50779010, 50579080), National Natural Science Foundation Key Project (Grant No. 50539010).
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The authors would like to thank the Youth Fund Project of the National Natural Science Foundation (No. 51304088) for providing the financial support to conduct this research.
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Besides manpower and material consumed on leak detection can be reduced too.
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With the rapid development of network science and technology, people are dependent on the network and usage greatly improved, but the network to bring convenience, but it also brings a lot of network security issues, it has become a constraint library computer network construction greatest limiting factor.
Logical structure of the safety system The Basic Principles of Network Security System For the safety of the computer in the library and its network system requirements include: Make sure the file and transaction information is not tampered with, library information to be protected; personal information confidential; various data material in the library can have timely access and so on [2].
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Recently, an innovative material, nano-sized particle has been used in suspension in conventional heat transfer fluids that changes the heat transfer characteristic.
Polyurethane foam material is used as a insulating liner inside the cone.
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