Wyniki wyszukiwania - BazTech

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Wyniki badań sejsmicznych systemu mocowania szkła dekoracyjnego do ścian

Gulnick Jim

Świat Szkła

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2023

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R. 28, nr 7-8

38--43

2

Seismic behavior of precast concrete coupled shear walls with yielding-based and friction-based coupling beams

Fang Qiang, Sun Jian, Qiu Hongxing, Dal Lago Bruno, Chen Weihong

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 2

art. no. e104, 2023

EN

An innovative bolt-connected precast concrete (PC) shear wall structural system has recently been proposed for middle and high-rise buildings in seismic regions. As a further research step, this paper aims to investigate the seismic behavior of PC coupled shear wall with different types of dissipative coupling beams. The quasi-static cyclic tests on two PC coupled shear wall specimens with friction-based coupling beam (FCB) and yielding-based coupling beam (YCB) were conducted. Moreover, nonlinear finite element models of the specimens were established and validated with the experimental results. The results demonstrated that the proposed dissipative coupling beams can effectively couple the wall panels in elastic field, whilst they can sustain large plastic deformation adding to the structural assembly a relevant source of energy dissipation under thresholded actions. Whilst the specimen with YCB exhibited large overstrength in plastic field, the specimen with FCB provided a more stable plateau capacity associated to enhanced deformation capacity, ductility and energy dissipation. Moreover, the FCB resulted practically undamaged and immediately reusable at the end of the test, whilst the YCB was found highly plasticized and locally torn. In addition, the detailed finite element models of the test specimens accurately predicted the experimental behavior.

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Określenie modułu ścinania gruntów mineralnych i organicznych na podstawie badań dylatometrycznych DMT i SDMT

Rabarijoely S., Szczygielski K.

Landform Analysis

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2014

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Vol. 26

95--103

PL

Niniejszy artykuł poświęcony jest analizie warunków geotechnicznych oraz wyznaczeniu zależności, pozwalających na obliczenie modułu ścinania Go dla gruntów mineralnych i organicznych obiektów zlokalizowanych na terenie kampusu SGGW i osiedla Stegny. We wstępie przedstawiono opis badań standardowym dylatometrem Marchettiego i sejsmicznym dylatometrem SDMT oraz sposób interpretacji uzyskanych wyników. Zaprezentowano także ogólny opis teoretyczny badań sejsmicznych wraz z charakterystyką fal poprzecznych, podłużnych i powierzchniowych, wykorzystywanych w geotechnice. Ponadto omówiono budowę geologiczną i warunki hydrogeologiczne oraz scharakteryzowano parametry geotechniczne na terenie wyżej wymienionych obiektów. Ostatnia część artykułu to propozycja nomogramów klasyfikacyjnych dla gruntów mineralnych i organicznych oraz możliwości wykorzystania modułu ścinania w interpretacji wyników badań SDMT.

EN

The paper is devoted to the analysis of the geotechnical conditions and determination of relationships allowing to estimate the shear modulus of mineral and organic soils for sites located in SGGW campus and in Stegny site in Warsaw. In the literature overview there have been presented description of Marchetti Dilatometer test and Seismic Dilatometer test (SDMT) as well as the methodology of these tests and parameters evaluation. Also there have been shown a theoretical description of seismic tests with characteristics of transverse, longitudinal and surface waves used in geotechnics. Furthermore there have been presented geological and hydrogeological structure as well as geotechnical conditions of sites mentioned above. In the last stage of this work there have been proposed relationships and classification charts of mineral and organic soils and the possibilities of using shear modulus.

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Recovery of medium properties in three dimensions with three-dimensional parameters variability

Masood K., Zaman F. D.

Journal of Technical Physics

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2007

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Vol. 48, no 1

29-38

EN

We consider a problem of identification of physical properties of the Earth using the damped wave equation, based on the linearized inversion associated with Horn's inversion theory. We assume that damping and sound speed are well approximated by the background plus the perturbation. Application of the method leads to a linear integral equation involving variations in sound speed and damping. Our aim is to recover these variations in velocity and damping, what in turn yields a map of the interfaces in the interior of the Earth. We consider the three-dimensional inverse problem of determining three-dimensional variations in the propagation speed and damping by considering the damped wave equation. We exploit the high-frequency character of seismic data to simplify the problem.