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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22 Jan 1981
TL;DR: In this article, a thorough review of most of the possible approaches to reinforced concrete slab analysis and design is presented, including determination of the distribution of moments and shears using elastic theory; the direct design'' and equivalent frame'' methods of the American Concrete Institute's building code; limit procedures for ultimate load analysis and slab design using general lower bound theory, the strip method, and yield line theory; behavior of slabs at the service load, deflection, and crack control; shear strength; and the effect of membrane action on slab strength.
Abstract: Provides a thorough review of most of the possible approaches to reinforced concrete slab analysis and design. Includes determination of the distribution of moments and shears using elastic theory; the direct design'' and equivalent frame'' methods of the American Concrete Institute's building code; limit procedures for ultimate load analysis and slab design using general lower bound theory, the strip method, and yield line theory; behavior of slabs at the service load, deflection, and crack control; shear strength; and the effect of membrane action on slab strength. Provides an introduction to prestressed slabs.
281 citations
TL;DR: In this article, the optical modes of an ionic crystal slab are examined in the radiative region starting from Maxwell's equations including retardation, and it is argued that the modes which characterize the system are virtual modes, which have oscillatory fields outside the slab and correspond to energy transport out of the slab.
Abstract: The optical modes of an ionic crystal slab are examined in the radiative region starting from Maxwell's equations including retardation. Since any excitation of the crystal in this region will radiate its energy, it is argued that the modes which characterize the system are virtual modes, which have oscillatory fields outside the slab and correspond to energy transport out of the slab. The determining equations for the virtual modes are obtained and are solved for LiF considering both $S$ and $P$ polarizations and a wide range of slab thicknesses. Characteristics of the modes of particular importance in determining the optical properties of a slab are emphasized. The effect of lattice anharmonicities on the properties of the virtual modes is discussed.
278 citations
TL;DR: In this article, the authors conducted a set of numerical experiments to study the evolution of a subduction-collision system subject to spontaneous slab breakoff, taking into account complex rheological behaviour including plasticity, viscous creep and Peierls creep.
278 citations
TL;DR: In this article, a three-dimensional seismic velocity structure in and around the Philippine Sea plate subducting beneath southwestern Japan is determined by applying double-difference tomography method to arrival time data for earthquakes obtained by a dense nationwide seismic network in Japan.
Abstract: [1] Three-dimensional seismic velocity structure in and around the Philippine Sea plate subducting beneath southwestern (SW) Japan is determined by applying double-difference tomography method to arrival time data for earthquakes obtained by a dense nationwide seismic network in Japan. A region of low S wave velocity and high Vp/Vs of several kilometers in thickness is recognized immediately above the region of intraslab seismicity in a wide area from Tokai to Kyushu. This characteristic layer dips shallowly in the direction of slab subduction. Compared with the upper surface of the Philippine Sea slab based on seismic reflection and refraction surveys on seven survey lines, we interpret that the low-Vs and high-Vp/Vs layer corresponds to the oceanic crust of the Philippine Sea slab. On the basis of the position of the low-Vs and high-Vp/Vs layer and the precisely relocated hypocenter distribution of intraslab earthquakes, the upper surface of the Philippine Sea slab is reliably determined for the entire area of SW Japan. Nonvolcanic deep low-frequency earthquakes that occurred associated with the subduction of the Philippine Sea slab are distributed along the isodepth contour of 30 km in SW Japan, except for the Tokai district where the depth of deep low-frequency earthquakes becomes gradually deeper toward northeast.
277 citations
TL;DR: In this paper, the authors examined the long-term strength of continental lithosphere and concluded that the creme-brulee model cannot explain either the persistence of mountain ranges or the integrity of the downgoing slab in collisional systems.
Abstract: There has been much debate recently concerning the long-term (i.e., >1 m.y.) strength of continental lithosphere. In one model, dubbed jelly sandwich, the strength resides in the crust and mantle, while in another, dubbed creme brulee, the mantle is weak and the strength is limited to the crust. The different models have arisen because of conflicting results from elastic thickness and earthquake data. We address the problem here by first reviewing elastic thickness estimates and their relationship to the seismogenic layer thickness. We then explore, by numerical thermomechanical modeling, the implications of a weak and strong mantle for structural styles. We argue that, irrespective of the actual crustal strength, the creme brulee model is unable to explain either the persistence of mountain ranges or the integrity of the downgoing slab in collisional. systems. We conclude that while the creme -brulee model may apply in some tectonic settings, a more widely applicable model is the jelly sandwich.
276 citations