Download e-book for kindle: AISC Seismic Design Manual by American Institute Of Steel Construction (Aisc), Structural

By American Institute Of Steel Construction (Aisc), Structural Steel Educational Council

This six-part guide helps the 2005 AISC Seismic Provisions. It contains sections on common layout issues; layout of structures using R = three (braced and second frames); layout of braced-frame structures using R > three; layout of second body structures using R > three; and layout of different structures using R > three.

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Extra resources for AISC Seismic Design Manual

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Effective pore pressure Classical poromechanics account for the stress related to the skeleton and the stress related to the fluid separately. 3] where Σe is the global stress tensor related to the porous continuum in the Eulerian frame, Σes and Σef are the skeleton and fluid stress tensors in the Eulerian frame, respectively, and Pb is the bulk fluid pressure. Thus, the intrinsic averaged stress within the fluid is addressed through the spherical tensor −Pb ½. This comes down to considering that the fluid applies an isotropic pressure on the pores walls, which is equal to the bulk pressure.

2). 2. Sketch of the fluid density profile in a nanopore. The graycolored area stands for the total number of interstitial fluid nt present in the pore. 52] show that, at constant bulk pressure, the effective pore pressure and effective permeability increase with the ratio nex /nt . In the limit of weak adsorption and weak confinement effects, nt nex as the interstitial fluid is in the same thermodynamical sate as that of the bulk fluid. 52] indicate that the effective pore pressure and effective permeability equal the bulk fluid pressure and the actual permeability, respectively.

In [COU 04], [COU 10]. g. solids with pores down to the nanometer size (≤ 2 nm). Hardened cement paste or tight rocks are among those materials, which can be used in construction, or may be encountered in the production of gas from very tight reservoirs or coal seams. Aside from the classical fluid– solid interaction observed in macroporous materials, there are additional effects that should be considered in such materials: (i) adsorption is important because the inner surface of the pores is very large and surface forces cannot be neglected anymore; (ii) in very small pores, the molecules of fluid are Poromechanics of Nanoporous Materials 21 confined.

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