Analysis of parameters of railway bridge vibration caused by moving rail vehicles (original) (raw)
Related papers
Vibration Analysis on the Bridge Structures Caused by Train Load
2020
Abstract: The Muktiharjo Kaligawe railway bridge or BH 9 which located in KM 3+450 is truss bridge that has a special function,that is as a railway network where the BH 9 is a bridge with the steel frame type. Tests and analysis are done on two points of the bridge structures, those are in one third span of the bridge’s structure and another in the middle span of the bridge’s structure. The acceleration of vibration when the sensor accelerometer placed in one third part of the bridge’s structure influenced Y the most. While the acceleration of vibration when the sensor accelerometer placed in the middle part of the bridge’s structure influenced Z the most. The maximum acceleration in the one third part of the bridge structure where the Argo Anggrek train with the speed of 47 mph has the maximum acceleration towards X of 1.346270 m/s 2 , the maximum acceleration towards Y is 1.639314 m/s 2 , and the maximum acceleration towards Z is 1.315038 m/s 2 . Meanwhile the maximum acceleration...
Vibrations of railway bridges for high speed trains under moving loads varying in time
Engineering Structures, 2008
Experimental measurements show that the loads transmitted from train axles contain not only a constant component, but also significant alternating components in the range 0-6 Hz. Using the model of a simply supported beam transited by moving loads varying in time, the authors analyse the deflections produced in small and medium span bridges under the action of combined loads.
Resonant Vibrations of Two-Span Railway Bridges … Sigma
2015
In this study, resonant vibrations of two-span railway bridges subjected to high-speed trains (HSTs) are studied. The continuous beam is modelled by using Bernoulli-Euler beam theory, and the train is considered as a series of moving concentrated loads. The dynamic response is obtained analytically by using the assumed mode method. Effects of the speed parameter and the span to car length ratio on the response are examined. Numerical results show that the above mentioned parameters play very important role on the dynamic behavior of two-span bridges. İKİ AÇIKLIKLI DEMİRYOLU KÖPRÜLERİNİN HIZLI TREN GEÇİŞLERİ ALTINDAKİ REZONANS TİTREŞİMLERİ ÖZET Bu çalışmada iki açıklıklı demiryolu köprülerinin hızlı tren geçişleri altındaki rezonans titreşimleri ele alınmıştır. Sürekli kiriş, Euler-Bernoulli teorisine göre modellenmiş, tren ise tekil yüklerden oluşan bir yük katarı şeklinde düşünülmüştür. Mod birleştirme metodu kullanılarak dinamik tepkiler analitik olarak elde edilmiştir. Hız parame...
Assessment of Dynamic Loads on Railway Bridges
2012
The realistic assessment of dynamic loads on railway bridges can be very challenging. Depending on span and construction type there can be huge difference between predicted and measured response. Especially when comparing calculated and measured fundamental frequencies of short and medium single span filler beam bridges, measured values can sometimes be determined as twice as large as the calculated values. A monitoring system installed on a filler beam bridge is used to investigate the dynamic behaviour of the bridge. Crossings of different train types with different velocities and the resulting accelerations und deformations are compared to the respective calculated ones. Several methods to include the influence of structural boundary conditions are checked against each other. Furthermore fatigue phenomena are investigated, though for this particular filler beam bridge a fatigue check is not relevant for the dimensioning and in practice not required as there are no girder joints. ...
The main purpose of this paper is to investigate the influence of the interaction on the dynamic behaviour of a simply supported single span railway concrete viaduct for which measurement results are available, taking into account the railway track. We compare the computed acceleration response of the track-bridge system with and without interaction considering the dynamic characteristics of the real moving vehicles and taking into account the available modal identification and the acceleration response measurements carried out during the field tests.
Procedia Engineering, 2014
The study presents the vibration theory and random dynamic analysis of the series-of-types (designed by the author) of composite (steel-concrete) bridges loaded by a German ICE-3 high-speed train. The vibration theory includes: a continuously welded ballasted track structure, viscoelastic suspensions of rail-vehicles with two two-axle bogies each, non-linear Hertz contact stiffness and one-sided contact between the wheel sets and the rails, the viscoelastic and inertia features of the bridge, the viscoelastic track structure on and beyond the bridge, approach slabs. The basic random factor, i.e. vertical track irregularities of the track, is taken into consideration.
Procedia Engineering, 2017
Skew bridges are common in highways and railway lines when non perpendicular crossings are encountered. The structural effect of skewness is an additional torsion on the bridge deck which may have a considerable effect, making its analysis and design more complex In this paper, the dynamic vibration of skew bridges due to railway traffic including the vehicle-bridge interaction is analysed and studied. An analytical model following 3D beam theory is first developed. Following, a simplified 2D model is also considered which includes only vertical beam bending. Both models are applied to a short skew real bridge from the Spanish railway network. The dynamic responses of the bridge obtained from both models are compared with the results obtained by a 3D FE model. A parametric study for a large number of bridges is performed with the simplified model in order to investigate the influence of various parameters as skew angle, span length and torsion stiffness.
Dynamic Analysis of Railway Bridges under High Speed Trains
Universal Journal of Mechanical Engineering, 2014
The interest in dynamic behavior of railway bridges has increased in recent years with the introduction of high speed trains. Higher speeds of the trains have resulted in larger and more complicated loads than earlier, producing significant dynamic effects. The dynamic aspects are of special interest and have often shown to be the governing factor in the structural design. Dynamic analysis of railway bridges is, therefore, required for high train speeds. The objective of this paper is to investigate the dynamic behavior of an existing railway bridge subjected to high speed trains. A railway bridge model has been developed to study dynamic effects such as oscillations produced by moving loads of constant magnitude and to obtain a relation between the velocity, acceleration, load position and deflection of the bridge at any instant of loading, with and without damping, with the help of MATLAB software. The simulation results indicate that the speed of the vehicle is a very important parameter influencing the dynamic response of a railway bridge. The amplitude of bridge deflection has been found to be the highest at speeds between 75 and 85 m/s. Further, the introduction of damping has been found to greatly influence of the amplitude of bridge deflection response. However, the peak deflection values appear at the same speed independent of the damping coefficients.
An analysis of footbridge vibration parameters
Measurement, 2015
In the paper, an analysis of the spread of intensity of wavelet of a mechanical object (a metal structure of a bridge) and its parameters is carried out upon application of the theory of covariance functions. The results of measuring the intensity of vibrations in fixed points were recorded on the time scale in a form of data arrays (matrixes). The estimates of covariance functions between the arrays of digital results in measuring the intensity of vibrations and the estimates of covariance functions of single arrays were calculated upon changing the quantization interval on the time scale. In the calculation, software Matlab 7 was applied.