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41.
A simple plane frame model is described for the lateral load analysis—static and dynamic—of frames in multistory buildings including biaxial load effects. By taking advantage of the shear force-axial force and the torque-bending moment analogies it is possible to model the spatial behavior of the structure, and to consider the combined effects of bidirectional shear due to lateral and torsional displacements on columns pertaining to two orthogonal frames. A numerical example is given. 相似文献
42.
Youren Xu Chao M. Huang Waltraud M. Kriven Avigdor Zangvil 《Journal of the American Ceramic Society》1994,77(8):2213-2216
The microstructure of a pressureless sintered (1605°C, 90 min) O'+β' SiAlON ceramic with CeO2 doping has been investigated. It is duplex in nature, consisting of very large, slablike elongated O' grains (20–30 μm long), and a continuous matrix of small rodlike β' grains (< 1.0 μm in length). Many α-Si3 N4 inclusions (0.1–0.5 μm in size) were found in the large O' grains. CeO2 -doping and its high doping level as well as the high Al2 O3 concentration were thought to be the main reasons for accelerating the reaction between the α-Si3 N4 and the Si-Al-O-N liquid to precipitate O'–SiAlON. This caused the supergrowth of O' grains. The rapid growth of O' crystals isolated the remnant α–Si3 N4 from the reacting liquid, resulting in a delay in the α→β-Si3 N4 transformation. The large O' grains and the α-Si3 N4 inclusions have a pronounced effect on the strength degradation of O'+β' ceramics. 相似文献
43.
Cheng-Yuan Tsai Chien-Cheng Lin Avigdor Zangvil Ai-Kang Li 《Journal of the American Ceramic Society》1998,81(9):2413-2420
The oxidation of hot-pressed SiC-particle (SiCp )/zirconia (ZrO2 )/mullite composites with various ZrO2 contents, exposed in air isothermally at 1000° and 1200°C for up to 500 h, was investigated; an emphasis was placed on the effects of the ZrO2 content on the oxidation behavior. A clear critical volume fraction of ZrO2 existed for exposures at either 1000° or 1200°C: the oxidation rate increased dramatically at ZrO2 contents of >20 vol%. The sharp transition in the oxidation rate due to the variation of ZrO2 content could be explained by the percolation theory, when applied to the oxygen diffusivity in a randomly distributed two-phase medium. Morphologically, the composites with ZrO2 contents greater than the critical value showed a large oxidation zone, whereas the composites with ZrO2 contents less than the critical value revealed a much-thinner oxidation zone. The results also indicated that the formation of zircon (ZrSiO4 ) at 1200°C, through the reaction between ZrO2 and the oxide product, could reduce the oxidation rate of the composite. 相似文献
44.
Robert Ruh Michael Kearns Avigdor Zangvil Youren Xu 《Journal of the American Ceramic Society》1992,75(4):864-872
Boron carbide–boron nitride particulate composites were fabricated by vacuum hot-pressing. Near-theoretical densities of B4 C were obtained, but percent theoretical densities decreased with increasing amounts of BN. The grain size of B4 C and BN was not affected by composition, but the amount of twinning in B4 C decreased with increasing BN content. No third phase was found at the B4 C–BN interface by analytical STEM analysis. Lattice parameter measurements indicated slight solubility of B4 C in BN, but no solubility of BN in B4 C for samples hot-pressed at 2250°C. Room-temperature flexural strength measurements revealed a sharply decreasing strength with increasing BN content up to 40% BN, and then relatively constant values with greater amounts of BN. 相似文献
45.
46.
It is shown that the torsional analysis of tube structures can be performed directly by means of standard plane frame or plane stress finite element computer programs rather than by three-dimensional procedures. By considering in-plane rigidity of the floor slab and the presence of an elastic axis, it is shown that the only modifications required in these programs are the separate assembly of the stiffness submatrices of elements located at different distances from the axis, and the factoring of results by the distance ratios to a reference frame. 相似文献
47.
This article is a report detailing a coordinated crisis intervention undertaken in response to a disastrous collision of a railway train with a school bus. The target groups consisted of school-children, parents, and school staff. The effects of this mass disaster and the scope of the large-scale emergency intervention implemented in its wake are described. Emphasized are the role and importance of coordinated intervention in a mass emergency as a critical variable in (a) applying basic crisis intervention principles, (b) supervising intervention activities, and (c) implementing psychoeducational and short-term therapeutic procedures. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
48.
An approximate method is proposed for the dynamic analysis of torsionally coupled tall building structures by utilizing the properties of their uncoupled counterparts. An exact solution is first given for the particular case in which the lateral and torsional stiffness matrices are uncoupled by same transformation. The method is then applied to a wider class of structures where this condition is only approximately satisfied by reducing the dynamic coupling problem to an approximate two-degrees-of-freedom system. Simple formulae and graphical representations of dynamic magnification of static eccentricity are given. Two numerical examples illustrate the use of the proposed method, checking on its accuracy and comparing its results with seismic code provisions. 相似文献