Dynamic response of a composite bridge to mining tremors from main mining regions in Poland

2021 ◽  
pp. 678-678
Author(s):  
I.J. Drygala ◽  
J.M. Dulinska
Keyword(s):  
Dynamic Response ◽  
Composite Bridge ◽  
Mining Tremors ◽  
Mining Regions

Neural Networks for the Simulation and Identification Analysis of Buildings Subjected to Paraseismic Excitations

2007 ◽  
pp. 393-432 ◽  
Author(s):  
Krystyna Kuzniar ◽  
Zenon Waszczyszyn
Keyword(s):  
Neural Networks ◽  
Structural Dynamics ◽  
Dynamic Properties ◽  
Response Spectra ◽  
Engineering Practice ◽  
Identification Analysis ◽  
Dynamics Problems ◽  
Mining Tremors ◽  
Testing Patterns ◽  
Mining Regions

The chapter deals with an application of neural networks to the analysis of vibrations of medium-height prefabricated buildings with load-bearing walls subjected to paraseismic excitations. Neural network technique was used for identification of dynamic properties of actual buildings, simulation of building responses to paraseismic excitations as well as for the analysis of response spectra. Mining tremors in strip mines and in the most seismically active mining regions in Poland with underground exploitation were the sources of these vibrations. On the basis of the experimental data obtained from the measurements of kinematic excitations and dynamic building responses of actual structures the training and testing patterns were formulated. It was stated that the application of neural networks enables us to predict the results with accuracy quite satisfactory for engineering practice. The results presented in this chapter lead to a conclusion that the neural technique gives new prospects of efficient analysis of structural dynamics problems related to paraseismic excitations.

Investigation of Effective Parameters on Dynamic Response of Composite Bridge Under Moving Vehicle

2010 ◽  
Author(s):  
Ali Asghar Jafari ◽  
Nader Vahdat Azad
Keyword(s):  
Dynamic Response ◽  
Numerical Solutions ◽  
Damping Ratio ◽  
Mass Parameter ◽  
Equations Of Motion ◽  
Large Mass ◽  
Effective Parameters ◽  
Moving Vehicle ◽  
Vehicle Acceleration ◽  
Composite Bridge

In this paper, the effects of various parameters influencing on the dynamic response of composite bridge are investigated by FEM method. Herein composite bridge with one, two and four degree of freedom for vehicle has been studied. The corresponding Equations of motion are integrated numerically by applying the Newmark’s method. The models were verified by analytical and numerical solutions available for isotropic bridge. The speed of the vehicle, mass ratio, bridge damping on the dynamic deflection and acceleration and effect of composite bridge layup have been analyzed. Bridge damping can significantly decrease the acceleration of the structure, and it is true particularly for higher values of the speed parameters. Dynamic deflection is not influenced by damping changes; however, it also reduces with the increase of the damping ratio. Bridge damping has negligible effect on the vehicle acceleration. The bridge acceleration generally increases with the mass parameter. The vehicle acceleration increases much steeply and reaches much higher values for large mass parameters.

3D Vs. 2D Modeling of Concrete Gravity Dam Subjected to Mining Tremor

2013 ◽  
Vol 405-408 ◽  
pp. 2015-2019 ◽  
Author(s):  
Joanna M. Dulinska ◽  
Anna Galuszka
Keyword(s):  
Dynamic Response ◽  
Three Dimensional ◽  
3D Models ◽  
Gravity Dam ◽  
Internal Stresses ◽  
Concrete Gravity Dam ◽  
Principal Stresses ◽  
Concrete Gravity Dams ◽  
Mining Tremors ◽  
2D And 3D

The paper indicates the role of 3D modeling of concrete gravity dams in evaluation of dynamic response of dams to mining tremors which occur in mining activity regions. 2D and 3D models of a concrete gravity dam were prepared in order to compare two-and three-dimensional analysis of the dynamic response of dam to mining shock. Firstly, values of natural frequencies obtained for 2D and 3D models occurred to be very similar, but only the 3D model allowed to predict the dam behaviour under longitudinal kinematic excitation. Secondly, the comparison of the maximal principal stresses obtained for 2D and 3D models indicates that the simplified 2D analysis underestimates the values of dynamic response on about 20 %. Three-dimensional dynamic analysis allows to assess internal stresses resulting from mining shock more precisely, since the amplitudes of ground vibrations during mining tremors are comparable in three directions.

3D vs. 2D Modeling of Concrete Gravity Dam Subjected to Mining Tremor

2013 ◽  
Vol 325-326 ◽  
pp. 1324-1328 ◽  
Author(s):  
Joanna Dulinska
Keyword(s):  
Dynamic Response ◽  
Three Dimensional ◽  
3D Models ◽  
Gravity Dam ◽  
Internal Stresses ◽  
Concrete Gravity Dam ◽  
Principal Stresses ◽  
Concrete Gravity Dams ◽  
Mining Tremors ◽  
2D And 3D

The paper indicates the role of 3D modeling of concrete gravity dams in evaluation of dynamic response of dams to mining tremors which occur in mining activity regions. 2D and 3D models of a concrete gravity dam were prepared in order to compare two-and three-dimensional analysis of the dynamic response of dam to mining shock. Firstly, values of natural frequencies obtained for 2D and 3D models occurred to be very similar, but only the 3D model allowed to predict the dam behaviour under longitudinal kinematic excitation. Secondly, the comparison of the maximal principal stresses obtained for 2D and 3D models indicates that the simplified 2D analysis underestimates the values of dynamic response on about 20 %. Three-dimensional dynamic analysis allows to assess internal stresses resulting from mining shock more precisely, since the amplitudes of ground vibrations during mining tremors are comparable in three directions.

scholarly journals Dynamic response of a cable-stayed footbridge to high-energy mining tremors

2019 ◽  
Vol 106 ◽  
pp. 01022
Author(s):  
Izabela Drygała ◽  
Joanna M. Dulinska ◽  
Maria Anna Polak ◽  
Marek Wazowski
Keyword(s):  
Dynamic Response ◽  
High Energy ◽  
Mining Activity ◽  
Dynamic Responses ◽  
Fe Model ◽  
Coal Basin ◽  
Kinematic Excitation ◽  
Upper Silesian Coal Basin ◽  
Mining Tremors ◽  
Standard Software

In this work an analysis of the dynamic response of a cable-stayed footbridge to mining tremors typical for two main regions of mining activity in Poland, i.e. the Legnica-Glogow Copper District (LGCD) and the Upper Silesian Coal Basin (USCB) is presented. For analysis, a 3-D finite element (FE) model of the structure was created in the ABAQUS/Standard software program. As a final result, the dynamic responses of the footbridge to the typical mining tremors were delivered. For this stage, the numerical simulations were conducted with the non-uniform kinematic excitation as well as with the uniform kinematic excitation. Finally, the evaluation of two calculation approaches was also made for the studied structure.

Dynamic response of two-span continuous composite bridges

1988 ◽  
Vol 15 (4) ◽  
pp. 579-588 ◽  
Author(s):  
Nabil F. Grace ◽  
John B. Kennedy
Keyword(s):  
Dynamic Response ◽  
Natural Frequencies ◽  
Plate Theory ◽  
Strain Range ◽  
Fatigue Cracking ◽  
Repeated Loading ◽  
Real Problem ◽  
Bridge Model ◽  
Composite Bridges ◽  
Composite Bridge

With the continuing trend towards lighter and more flexible continuous composite bridges, problems of vibration are becoming increasingly more important. Furthermore, fatigue cracking can be a real problem in such bridges when subjected to several thousands of resonance cycles over its life. In this paper the dynamic response of continuous composite bridges and the influence of repeated loading at resonance frequency on the structural response are investigated. A closed-form series solution based on orthotropic plate theory is developed to predict the natural frequencies of two-span continuous composite bridges. Expressions for the equivalent rigidities of a composite bridge are also given. The results are verified and substantiated by experimental results from 1/4-scale bridge model. Estimates of frequencies based on beam theory as well as the effects of concrete and fatigue cracking on the natural frequencies and strain range are examined. Finally, it is shown that a fatigue-cracked composite bridge, when properly repaired, can regain most of its stiffness and ultimate load-carrying capacity. Key words: bridges, composite, concrete, continuous, dynamics, fatigue, orthotropic, rigidities, steel, tests.

Simulation of Dynamic Behaviour of RC Bridge with Steel-Laminated Elastomeric Bearings under High-Energy Mining Tremors

2012 ◽  
Vol 531-532 ◽  
pp. 662-667 ◽  
Author(s):  
Joanna M. Dulinska ◽  
Radoslaw Szczerba
Keyword(s):  
Dynamic Response ◽  
High Energy ◽  
Dominant Frequency ◽  
Dynamic Responses ◽  
Principal Stresses ◽  
Elastomeric Bearings ◽  
Motion Data ◽  
Elastomeric Material ◽  
Non Linear ◽  
Mining Tremors

In the paper a detailed analysis of dynamic responses of a reinforced concrete bridge with steel-laminated elastomeric bearings to high-energy mining tremors registered in two main regions of mining activity in Poland (i.e. Upper Silesian Coal Basin and Legnica-Glogow Copper District) was presented. The representative time histories of accelerations from both regions were used as ground motion data in calculations of the dynamic response of the structure. The two-coefficient Mooney-Rivlin model was used as a constitutive model for hyperelastic non-linear elastomeric material. It was proved that the dynamic response of the bridge was strongly dependent not only on the level of vibration amplitudes but on the dominant frequency range of the mining shock typical for the mining region as well. Also the height of elastomeric bearings occurred to have considerable influence on the total dynamic response of the bridge. Two heights of bearings were analyzed: 42 mm and 85 mm. The increase of the height of bearings caused the decrease up to 25 % in the maximal principal stresses obtained in the dynamic analysis. The behaviour of elastomeric material in case of bearings 42 mm high occurred to be strongly non-linear, whereas in case of bearings 85 mm high behaviour of elastomeric material remained almost linear.

Human pilot dynamic response in flight and simulator.

1958 ◽  
Author(s):  
Edward Seckel ◽  
Ian A. M. Hall ◽  
Duane T. McRuer ◽  
David H. Weir
Keyword(s):  
Dynamic Response
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