Topic
Slab
About: Slab is a research topic. Over the lifetime, 31617 publications have been published within this topic receiving 318693 citations.
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TL;DR: In this article, the authors identify trends in the moment-rotation behavior of the connections from comparison of the cyclic behavior against parameters such as number of bolts, type of concrete, use of slab reinforcement, and the presence of a column web cavity.
Abstract: Shear tab connections, acting compositely with the floor slab, are capable of providing some lateral resistance in steel frame buildings. This resistance was suspected from the events of the 1994 Northridge Earthquake and verified in a series of tests. For performance evaluation of steel structures, it is necessary to quantify the non-negligible rotational strength and stiffness of these composite connections, a task that cannot be accomplished through the use of simple rules of thumb. Therefore, trends in the moment–rotation behavior of the connections are identified from comparison of the cyclic behavior against parameters such as number of bolts, type of concrete, use of slab reinforcement, and the presence of a column web cavity. Analysis of these trends leads to guidelines for determining parameters for a basic backbone moment–rotation curve. These guidelines depend heavily on applicable limit states for elements of the connections and connection geometry. Predicted values of moment and rotation capa...
103 citations
TL;DR: In the Tonga subduction zone, a systematic shear deformation, in which deep material moves relatively to the south, is superimposed on the mode of down-dip shortening which is characteristic of the region.
Abstract: In the Tonga subduction zone, a systematic shear deformation, in which deep material moves relatively to the south, is superimposed on the mode of down-dip shortening which is characteristic of the region. We interpret this observation, together with a tectonic reconstruction, in terms of the interaction between the subducting lithospheric slab and a horizontal shear flow in the mantle.
103 citations
TL;DR: In this paper, a size effect law for fracture triggering in dry snow slabs of high enough length-to-thickness ratio is formulated, based on simplified one-dimensional analysis by equivalent linear elastic fracture mechanics.
Abstract: (1) A size effect law for fracture triggering in dry snow slabs of high enough length-to- thickness ratio is formulated, based on simplified one-dimensional analysis by equivalent linear elastic fracture mechanics. Viscoelastic effects during fracture are neglected. The derived law, which is analogous to Bazant's energetic size effect law developed for concrete and later for sea ice, fiber composites, rocks, and ceramics, is shown to agree with two-dimensional finite element analysis of mode II cohesive crack model with a finite residual shear stress. Fitting the proposed size effect law to fracture data for various slab thicknesses permits identifying the material fracture parameters. The value of preexisting shear stress in a thin weak zone of finite length is shown to have significant effect. There exists a certain critical snow depth, depending on the preexisting stress value, below which the size effect disappears. Practical applications require considering that the material properties (particularly the mode II fracture toughness or fracture energy) at the snow slab base are not constant but depend strongly on the slab thickness. This means that one must distinguish the material size effect from the structural size effect, and the combined size effect law must be obtained by introducing into the structural size effect law dependence of its parameters on snow thickness. The thickness dependence of these parameters can be obtained by matching the combined law to avalanche observations. Matching Perla's field data on 116 avalanches suggests that the mode II fracture toughness is approximately proportional to 1.8 power of snow thickness. INDEX TERMS: 1827 Hydrology: Glaciology (1863); 1863 Hydrology: Snow and ice (1827); 3210 Mathematical Geophysics: Modeling; 3220 Mathematical Geophysics: Nonlinear dynamics; 8020 Structural Geology: Mechanics; KEYWORDS: snow, avalanches, scaling, size effect, fracture mechanics
103 citations
TL;DR: Anderson et al. as mentioned in this paper examined shear wave splitting in teleseismic phases to observe seismic anisotropy in the South American subduction zone and inferred that anisotropic samples sampled by teleseismsic phases are localized within or below the subducting slab.
Abstract: [1] We examine shear wave splitting in teleseismic phases to observe seismic anisotropy in the South American subduction zone. Data is from the CHARGE network, which traversed Chile and western Argentina across two transects between 30� S and 36� S. Beneath the southern and northwestern parts of the network, fast polarization direction (j) is consistently trench-parallel, while in the northeast j is trench-normal; the transition between these two zones is gradual. We infer that anisotropy sampled by teleseismic phases is localized within or below the subducting slab. We explain our observations with a model in which eastward, Nazca-entrained asthenospheric flow is deflected by retrograde motion of the subducting Nazca plate. Resulting southward flow through this area produces N-S j observed in the south and northwest; E-W j result from interaction of this flow with the local slab geometry producing eastward mantle flow under the actively flattening part of the slab. INDEX TERMS: 7203 Seismology: Body wave propagation; 7218 Seismology: Lithosphere and upper mantle; 8123 Tectonophysics: Dynamics, seismotectonics; 8150 Tectonophysics: Plate boundary—general (3040); 9360 Information Related to Geographic Region: South America. Citation: Anderson, M. L., G. Zandt, E. Triep, M. Fouch, and S. Beck (2004), Anisotropy and mantle flow in the Chile-Argentina subduction zone from shear wave splitting analysis, Geophys. Res. Lett., 31, L23608, doi:10.1029/ 2004GL020906.
103 citations
TL;DR: In this paper, the flux-pinning-induced magnetostriction of hard type-II superconductors was analyzed using the plane strain approach, where all stress and strain components were expressed in terms of the flux density profile in the slab, and apply for any critical-state model.
Abstract: The flux-pinning-induced magnetostriction of hard type-II superconductors shaped as a rectangular slab is analyzed. An exact solution of the magnetoelastic three-dimensional problem is found using the plane strain approach. All stress and strain components are expressed in terms of the flux-density profile in the slab, and apply for any critical-state model j c5 j c(B). Discussed at some length is the tensile stress occurring for a descending magnetic field. Results for both the Bean model and the exponential model are presented. @S0163-1829 ~99!08217-X#
103 citations