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Your search keyword '"Mladenović Biljana"' showing total 2 results
Start Over Author "Mladenović Biljana" Topic earthquake intensity
2 results on '"Mladenović Biljana"'

1. Experimental and Numerical Study of Energy Dissipation Components of a New Metallic Damper Device.

Author

Zlatkov, Dragan, Ristić, Danilo, Zorić, Andrija, Ristić, Jelena, Mladenović, Biljana, Petrović, Žarko, and Trajković-Milenković, Marina

Subjects
EARTHQUAKE resistant design, ENERGY dissipation, EARTHQUAKE intensity, FINITE element method, BUILDING protection, ROTATIONAL symmetry, SEISMIC response, IRON & steel plates
Abstract

Purpose: The novel metallic damper device for passive vibration control of structures, which is designed primarily for seismic protection of buildings, is described in this paper. It consists of the base plate, fixed into foundation, with two concentric cycles of vertical components and a middle steel activating plate anchored to the isolated structure. During an earthquake, the middle steel activating plate moves together with main structure causing bending of vertical components. Seismic energy is absorbed due to plastic deformation of the vertical components of the damper. The performance of various vertical components, the key elements of the novel damper is studied in this paper. The advantages of this type of damper reflect in its ability to adapt its own features depending on the intensity of the earthquake and that it has equivalent characteristics in every horizontal direction due to rotational symmetry. Methods: Sixteen experimental tests of the vertical components of the damper, were conducted to obtain their hysteretic behaviour. Numerical models using the finite element method and the Abaqus/Standard software were developed, validated and verified with experimentally obtained results. Results: The experimental results show significant energy absorption of the vertical components of the novel damper. Numerical models can be used in further research instead of expensive experimental tests. Conclusions: The vertical components of the novel damper possess extraordinary hysteretic performance. If the components of the energy dissipation device are properly designed for maximum displacements, the device is not expected to suffer heavy damage or total failure during earthquakes. [ABSTRACT FROM AUTHOR]

Published
2022
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2. SEISMIC PROBLEMS OF THE SURROUNDINGS OF AN OPEN PIT MINE DURING MINING.

Author

Zdravković, Slavko, Zlatkov, Dragan, and Mladenović, Biljana

Subjects
STRIP mining, DRILLING & boring, EXPLOSIVES, BUILDING protection, EARTHQUAKE intensity, MINING engineering
Abstract

Seismic effects that occur during mining in open pits are similar to the seismic effects of small and medium intensity earthquake. The paper outlines how the enormous energy is released during a strong earthquake and regardless of the hypocenter depth that could be dozens of kilometers, the area affected by a strong earthquake is very large and the intensity is very high. Notwithstanding the much lower energy released during mining, there is a seismic damage to buildings in the surroundings, as pits are usually near residential areas. A complex solution of the problems of mining and seismic effects can be reached only by experimental investigation. Earthquake can not be controlled, but the mining can be directed in full, especially by adequate amount of explosive charge and direction of mining. So this fact must be taken into account and proposed formulas are based on these conditions. A special note is given to the seismic anomaly that buildings closer to the field of mining are in some cases less affected than more distant ones. Therefore the new non-standard formulas will be given in the paper, which are more adequate for solving this seismic anomaly. The influence of blasting location with two boreholes charged, one with the initial explosive at the top and the second in the bottom of the drill, is analyzed. This approach significantly contributed to solving some anomalies, such as that much of the wave's energy is released in the area far away from the mine. Hence there is a need for better protection from seismic effects on buildings at these locations. [ABSTRACT FROM AUTHOR]

Published
2012

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