Experimental study on the dynamic effects caused by vehicular traffic on a ferry boarding ramp

2002 ◽  
Vol 29 (1) ◽  
pp. 27-36
Author(s):  
Marc Savard ◽  
Marc-André Careau ◽  
Alain Drouin
Keyword(s):  
Dynamic Behaviour ◽  
Amplification Factor ◽  
Highway Bridges ◽  
Load Test ◽  
Heavy Vehicles ◽  
Dynamic Effects ◽  
Dynamic Amplification Factor ◽  
Dynamic Load Allowance ◽  
Factor Design ◽  
Dynamic Amplification

This article presents some of the results obtained during a load test conducted on a ferry boarding ramp operated by the Société des traversiers du Québec. The measurements highlight the sensitivity of these structures to the dynamic effects caused by two heavy vehicles. Since the dynamic behaviour of highway bridges is affected by parameters different from those that affect ferry boarding ramps, the article presents a reflection on the dynamic load allowance suitable for the evaluation or design of this latter type of structure.Key words: boarding ramp, bridge, dynamic amplification factor, design codes.

Dynamic Behaviour of Minimum Platforms Under Random Seas

2003 ◽  
Author(s):  
Micaela Pilotto ◽  
Beverley F. Ronalds
Keyword(s):  
Dynamic Response ◽  
Dynamic Behaviour ◽  
Amplification Factor ◽  
Finite Element Models ◽  
Dynamic Amplification Factor ◽  
Maximum Value ◽  
Random Seas ◽  
Exponential Stretching ◽  
Structural Configurations ◽  
Dynamic Amplification

This paper describes the dynamic response of minimum facilities with different structural configurations which are subjected to random seas. The finite element models are kept simple with the aim of focusing on the physics of the phenomena involved. The response is studied in terms of the dynamic amplification factor (DAF), representing the ratio between the dynamic and the static response. Two different formulations of the DAF under random seas are compared. The first is defined in terms of standard deviation (DAF1), the second in terms of the most probable maximum value (DAF2). Ringing is observed to be a relevant feature of the dynamic response and to affect primarily the braced monopod configurations. Ringing is detected using DAF2. The paper also addresses the importance of the kinematic representation above the still water level. Different methods of stretching the velocity field in the wave zone (delta, Wheeler and exponential stretching) are shown to have a significant impact on the dynamic response of the platforms.

Bridge dynamics and dynamic amplification factors — a review of analytical and experimental findings

1992 ◽  
Vol 19 (2) ◽  
pp. 260-278 ◽  
Author(s):  
Patrick Paultre ◽  
Omar Chaallal ◽  
Jean Proulx
Keyword(s):  
Soil Structure ◽  
Amplification Factor ◽  
Highway Bridges ◽  
Vehicle Speed ◽  
Dynamic Amplification Factor ◽  
Expansion Joints ◽  
Bridge Testing ◽  
Dynamic Amplification ◽  
Experimental Findings ◽  
Bridge Dynamics

The dynamic amplification factor (DAF) is an important parameter in the design of highway bridges and yet no worldwide consensus has been reached so far as to its value. Some disagreement exists between provisions of various national bridge codes. This is because the DAF depends, in addition to the maximum span or the natural frequency, on many other parameters that are difficult to take into account with reasonable accuracy. Vehicle speed, weight, and dynamic characteristics, the state of the structure, roadway roughness, expansion joints, the type of bridge supports, soil–structure interaction, and influence of secondary elements are some aspects influencing the DAF. This study reviews the analytical and experimental findings on bridge dynamics and the evaluation of the DAF. Key words: bridges, vibrations, bridge testing, bridge design codes, dynamic amplification factor.

scholarly journals DYNAMIC AMPLIFICATION FACTOR FOR BRIDGES WITH SPAN LENGTH FROM 10 TO 35 METERS

2015 ◽  
Vol 6 (4) ◽  
pp. 151-158 ◽  
Author(s):  
Ilze Paeglite ◽  
Ainars Paeglitis ◽  
Juris Smirnovs
Keyword(s):  
Amplification Factor ◽  
Heavy Traffic ◽  
Surface Condition ◽  
Road Surface ◽  
Load Carrying Capacity ◽  
Bridge Structure ◽  
Dynamic Effects ◽  
Dynamic Amplification Factor ◽  
Load Carrying ◽  
Dynamic Amplification

Heavy traffic on the bridge cause not only static effects, but also dynamic effects. These effects can be indicated by different dynamic parameters like – natural frequency, bridge logarithmical decrement, bridge acceleration and dynamic amplification factor (DAF). Dynamic amplification factor is the most widely used parameter, because it shows amplification of the static effects on the bridge structure. Results show that for bridges road surface condition is a very important factor. If road surface contains ice bumps or potholes then heavy traffic driving with low speed can decrease load carrying capacity of a bridge.

ON THE MAXIMUM AMPLIFICATION FACTOR OF A MOVING POINT FORCE ON A SIMPLE BEAM

1992 ◽  
Vol 16 (1) ◽  
pp. 61-81 ◽  
Author(s):  
J.L. Urrutia-Galicia ◽  
A. Salazar-Hernández
Keyword(s):  
Dynamic Behaviour ◽  
Amplification Factor ◽  
Point Force ◽  
Dynamic Amplification Factor ◽  
Static Displacement ◽  
Simply Supported Beam ◽  
Simply Supported ◽  
Middle Cross Section ◽  
Dynamic Amplification ◽  
Maximum Amplification

The dynamic behaviour of a simply supported beam traversed at constant velocity by a point force is thoroughly reviewed. In this work it is shown that the maximum dynamic amplification factor of a simple beam under a travelling point force is 1.74 times the static displacement due to that point force statically applied at the middle cross section of any simply supported beam. Besides it is also shown that this maximum amplification factor of 1.74 occurs at x=0.53 times the length of the beam ℓ when the load has reached the point 0.76ℓ and it corresponds to a velocity of 0.625 times the currently termed “resonance” velocity.

Analysis of test blanket module attachments under electromagnetic loads by using a dynamic amplification factor envelope

2018 ◽  
Vol 136 ◽  
pp. 1247-1251
Author(s):  
Raúl Muñoz ◽  
Francisco J. Calvo ◽  
Sergio Sádaba ◽  
Ana M. Gil ◽  
Javier Rodríguez ◽  
...  
Keyword(s):  
Amplification Factor ◽  
Dynamic Amplification Factor ◽  
Dynamic Amplification

scholarly journals A Study on Dynamic Amplification Factor and Structure Parameter of Bridge Deck Pavement Based on Bridge Deck Pavement Roughness

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Fei Han ◽  
Dan-hui Dan ◽  
Hu Wang
Keyword(s):  
Bridge Deck ◽  
Amplification Factor ◽  
Amplification Coefficient ◽  
Dynamic Amplification Factor ◽  
Vibration Load ◽  
Pavement Roughness ◽  
Composite Bridge ◽  
Dynamic Amplification ◽  
Cushion Layer ◽  
Bridge Deck Pavement

In order to study the coupled influence of deck pavement roughness and velocity on dynamic amplification factor, a 2-DOF 1/4 vehicle model is employed to establish the vehicle-bridge-coupled vibration system. The random dynamic load of running vehicle simulated by software MATLAB is applied on bridge deck pavement (BDP) through ANSYS software. Besides, the influence of BDP parameters on control stress under static load and random vibration load is analyzed. The results show that if the surface of BDP is smooth, the dynamic magnification coefficient would first increase and then decrease with increasing of vehicle velocity and reach its maximum value when v = 20 m/s; if the surface of BDP is rough, the maximal and minimum values of the dynamic amplification coefficient (DAC) occur, respectively, when the velocity reaches 10 m/s and 15 m/s. For a composite bridge deck with the cushion layer, the thickness of asphalt pavement should be not too thick or thin and better to be controlled for about 10 cm; with the increasing of cushion layer thickness, the control stress of deck pavement is all decreased and show similar change regularity under effect of different loads. In view of self-weight of structure, the thickness of the cushion layer is recommended to be controlled for about 4 cm.

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