Topic
Slab
About: Slab is a research topic. Over the lifetime, 31617 publications have been published within this topic receiving 318693 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the stiffness and strength of the connection between the wooden beam and the concrete slab are theoretically assessed. But the authors focus on the structural properties of the stud connection, and do not consider the deformation control of the beam.
Abstract: The stiffening and strengthening of wood floors with a thin collaborating concrete slab is a recent technique which appears particularly suitable for restoration work on ancient buildings. This research deals with the theoretical evaluation of the stiffness and strength of the connection between the wooden beam and the concrete slab. Toward this end, both the stiffness and the strength of the connection between the wooden beam and the concrete slab are theoretically assessed. The aim of the present research work is to define a simplified approach which allows the connection design to be based on deformation control. The stud connection is studied in the general case of wooden planks separating the concrete slab and the wooden beam. The initial stiffness of the connection is evaluated on the basis of the classical approach of the beam on elastic foundation, whereas the ultimate strength is based on the collapse mechanism with two plastic hinges in the stud shank. The failure mechanism leads to the definition of the minimum stud length. The results of the theoretical formulation are in good agreement with experimental results.
116 citations
TL;DR: In this article, the authors used arrival time data from earthquakes under Tohoku and Hokkaido land areas, and beneath the Pacific Ocean to determine the three-dimensional (3D) velocity structures (Vp and Vs) under the entire Northeast (NE) Japan-Kuril arc.
116 citations
TL;DR: In this paper, the most suitable secolldary cooling pattern for a cOlltillUOUS cast-illustrated cast-slab was found to be less than 83% of the upper part of the casting machille.
Abstract: Synopsis In order to redllce the occurrellce oj suiftlCe difects oj a cOlltillUOUS castillg slab, the most suitable secolldary coolillg pattern was de filled all the basis oj the results oj a theoretical calCillalioll allri a laboratory scale exIlerimellt all the thermal hysteresis similar to those oj cOlltilluous castillg slabs. M oreover, i t has been considered ill this study that the trallsverse corner cracks could be relaled to the p resellce oj precipitates appeared ill the austenite grain boundaries. (1) T rallsverse corner cracks are formed by the precipitates oj AI N ap/leared all the grain boundary in the austenite region at the temperatures in the rallge oj 700 to 950°C. Especially , the AIN Jormatioll is accelerated by reheatillg it at the temperature above 700 e Jrom Ihp. lower temperature. (2) From tlIP experimelltal results all the roles oj secondary coolillg pattern and oj temperature nt the unbending roll in slnbs continuously cnst, it is nscertained that the occurrence oj transverse corner crack is SllCcessflll~l' prevellted ~y the secolldary cooling pattern, that is, a suitable coolillg rate is less thall 83 e lm ill the upper part oj continuolls casting machille. (3) T he lI
115 citations
TL;DR: In this paper, the authors present numerical thermal-mechanical models of flat-slab subduction that show the flattening of the slab results in a compression of the continental plate through end loading.
Abstract: During the subhorizontal (flat) subduction of an ocean–lithosphere plate, the overlying continental plate is deformed far inland of the plate boundary. In addition, arc magmatism, which is caused by melting in the asthenospheric wedge during steep subduction, wanes or ends when the subduction is subhorizontal. The observed upper-plate deformation patterns have been explained by an end load exerted at the plate boundary or by stress transmitted into the overlying plate along the top of the flat slab. Here we present numerical thermal–mechanical models of flat-slab subduction that show the flattening of the slab results in a compression of the continental plate through end loading. The advancing flat slab scrapes off the lowermost 20–50 km of continental mantle lithosphere. The displaced continental mantle lithosphere fills the asthenospheric wedge, ending arc-type melting. If the displaced material is buoyant, it accumulates in a growing keel that migrates ahead of the slab; if it is dense, the displaced material sinks with the slab. Flat-slab removal renews the asthenospheric wedge and arc magmatism, and leaves a step in the lithosphere–asthenosphere boundary and/or a keel that consists of displaced continental mantle lithosphere. A fossil keel and a fossil step, formed during Laramide flat subduction, are preserved below the western United States. Continental mantle lithosphere is scraped from the base of the overriding plate by the underlying oceanic slab during flat subduction, according to numerical thermal–mechanical models.
115 citations
TL;DR: In this article, a slab of semiconductor material is placed between two photonic bandgap (PBG) mirrors, and waveguide modes at frequencies out of the PBG can be obtained.
Abstract: We show that by placing a slab of semiconductor material between two photonic bandgap (PBG) mirrors, waveguide modes at frequencies out of the PBG can be obtained. These modes are similar to the modes of a conventional dielectric slab waveguide. Using these modes, we can obtain very good coupling between a PBG waveguide and a dielectric slab waveguide with similar slab properties. We discuss the properties of these slab modes and outline the guideline for the optimization of the PBG waveguides based on these properties.
115 citations