Terrorist actions of the last decade obviously determine a reconsideration of the buildings safety, especially for those with special destinations (embassies, military facilities, nuclear plants etc.). Thus, the conception phase should include nowadays scenarios with exceptional actions, other than seismic loads:
impact, explosion, failure of supports. It is well-known that, after earthquakes, the most situations of structural collapse are determined by the terrorist attack using explosive. Even
more, it has been assessed that the main reason of loss of life is not the explosion itself, but the partial or total collapse of the exposed building. In order to secure the structural integrity,
collapse analysis should be taken into account as a complex phenomenon, composed of many processes that could be studied separately or as an ensemble. These processes are: the extreme action causes, design requirements, vulnerability
of the structure, starting and development of the collapse, its final effects. Study of these processes leads to additional special measures for design stage and, on the other hand, to valuable knowledge for controlled demolition of tall buildings, as part of bold urbanism projects in densely populated zones. Considering the above mentioned facts, this paper presents the results of a thorough analysis of a frame structure under explosive loads. The first part of the paper refers to the analysis of a phenomena assembly related to explosion and to the effects resulting from a terrorist attack using explosives (structural elements deterioration and failure, collapse initiation and eventual total failure). The second part of the paper presents an original approach to analyze a building structure
under extreme loads, using both classical (pushover) and modern (applied element method).
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CONTINUUM DAMAGE MODEL FOR NONLINEAR ANALYSIS OF MASONRY STRUCTURES
Author: Dott. Ing. Pelà Luca | Size: 5.7 MB | Format:PDF | Quality:Unspecified | Publisher: Universitat Politècnica de Catalunya | Year: 2008 | pages: 299
The present work focuses on the formulation of a Continuum Damage Mechanics model for nonlinear analysis of masonry structural elements. The material is studied at the macro-level, i.e. it is modelled as a homogeneous orthotropic continuum. The orthotropic behaviour is simulated by means of an original methodology, which is based on nonlinear damage constitutive laws and on the concept of mapped tensors from the anisotropic real space to the isotropic fictitious one. It is based on establishing a one-to-one mapping relationship between the behaviour of an anisotropic real material and that of an isotropic fictitious one. Therefore, the problem is solved in the isotropic fictitious space and the results are transported to the real field. The application of this idea to strain-based Continuum Damage
Models is rather innovative.
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Article/eBook Full Name: Behaviour of clay-fouled ballast under drained triaxial testing
Author(s): B. INDRARATNA; N. TENNAKOON; S. NIMBALKAR; C. RUJIKIATKAMJORN
Publish Date: 2012
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I'm using my IPAD for years in parallel with other computers to browse the forum. This evening every page is full of rows of red circles with a - in the middle blocking the view of some text lines. In the main page (as example) the titles and the logo are visible, the connected users too but the today posts area is hard to read and full of red icons. This behaviour is only for this site, every other site is as before. It starts about 16:30 (GMT) and i want to know if someone else have the same problem for asking Admin to search the reason. I repeat, all other sites accessed by Safari browser are without problems.
A comprehensive review of the material behavior of concrete under dynamic loads, especially impact and impuls, opens the volume. It is followed by a summary of the various analytical tools available to engineers interested in analyzing the nonlinear behavior of reinforced concrete members for dynamic load. These range from relatively simple and practice-oriented push-over analysis to sophisticated layered finite element models. Important design-related topics are discussed, with special emphasis on performance of concrete frames subjected to seismic loads. The significance of modern software systems is recognized by including extensive examples. For readers not current in dynamic analysis methods, an appendix contains a review of the mathematical methods most commonly used for such analysis.
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Article/eBook Full Name: 357.3R-14 Guide for Design and Construction of Waterfront and Coastal Concrete Marine Structures
Author(s): ACI Committee 357
Publish Date: 2014
ISBN: 9780870319372
Published By: ACI
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