Full-Scale Tests of a Railway Bridge

1998 ◽  
Vol 1624 (1) ◽  
pp. 140-147 ◽  
Author(s):  
E. Manos Maragakis ◽  
Bruce M. Douglas ◽  
Qingbin Chen ◽  
U. Sandirasegaram
Keyword(s):  
Los Angeles ◽  
Seismic Event ◽  
Ultimate Load ◽  
Dynamic Properties ◽  
Full Scale ◽  
Railway Bridge ◽  
Bridge Abutments ◽  
Railway Bridges ◽  
Load Tests ◽  
Full Scale Tests

Full-scale resonance and ultimate load tests of the Strawberry Park Underpass were conducted in March 1995. This bridge was typical of many railway bridges around the country—a two-span, 45.2-m (148-ft) long ballasted through plate girder railway bridge. It was located in Los Angeles and scheduled for removal in spring 1995. This fact allowed failure tests to be performed with the pushing loads applied at the bridge abutments. The main objectives of this experiment were to measure the dynamic properties of the bridge with and without the rails and to begin to identify the extent to which the unique railway bridge components, consisting of the rails, ties, ballast, and ballast pan, help strengthen it during a seismic event. It was found that the removal of the rails alone resulted in a slightly softer system and that the railway elements increased the ultimate capacity of the bridge significantly.

Fatigue assessment of steel riveted railway bridges: Full-scale tests and analytical approach

2021 ◽  
Vol 182 ◽  
pp. 106664
Author(s):  
Elisa Bertolesi ◽  
Manuel Buitrago ◽  
Jose M. Adam ◽  
Pedro A. Calderón
Keyword(s):  
Analytical Approach ◽  
Full Scale ◽  
Fatigue Assessment ◽  
Railway Bridges ◽  
Full Scale Tests

scholarly journals Application of Classical Land Surveying Measurement Methods for Determining the Vertical Displacement of Railway Bridges

2017 ◽  
Vol 27 (4) ◽  
pp. 169-183 ◽  
Author(s):  
Pelagia Gawronek ◽  
Maria Makuch
Keyword(s):  
Static Load ◽  
Vertical Displacement ◽  
Measurement Methods ◽  
Railway Bridge ◽  
Railway Bridges ◽  
Land Surveying ◽  
Vertical Displacements ◽  
Load Tests ◽  
Steel Railway Bridge ◽  
Displacement Measurements

Abstract The classical measurements of stability of railway bridge, in the context of determining the vertical displacements of the object, consisted on precise leveling of girders and trigonometric leveling of controlled points (fixed into girders' surface). The construction elements, which were measured in two ways, in real terms belonged to the same vertical planes. Altitude measurements of construction were carried out during periodic structural stability tests and during static load tests of bridge by train. The specificity of displacement measurements, the type of measured object and the rail land surveying measurement conditions were determinants to define methodology of altitude measurement. The article presents compatibility of vertical displacements of steel railway bridge, which were developed in two measurement methods. In conclusion, the authors proposed the optimum concept of determining the vertical displacements of girders by using precise and trigonometric leveling (in terms of accuracy, safety and economy of measurement).

Seismic performance of a full-scale, reinforced high-performance concrete building. Part I: Experimental study

2008 ◽  
Vol 35 (8) ◽  
pp. 832-848 ◽  
Author(s):  
Sébastien Mousseau ◽  
Patrick Paultre
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Dynamic Testing ◽  
Dynamic Properties ◽  
Full Scale ◽  
Building Structures ◽  
Seismic Behaviour ◽  
Earthquake Excitation ◽  
Concrete Building ◽  
Full Scale Tests

Full-scale tests provide valuable information on the characteristics of building structures that can be used to evaluate design methods, to calibrate modelling techniques, and to determine damage corresponding to loading levels. These tests are scarce due to the enormous requirements in testing space and specialized testing equipment. The seismic behaviour of a full-scale, two-storey, reinforced high-performance concrete building designed with moderate ductility detailing is evaluated by pseudo-dynamic testing, during which increasing seismic loads are applied, resulting in increasing levels of permanent damage to the structure. To monitor the level of damage, a series of successive forced-vibration tests are also carried out at each step of the process and are used to track changes in the key dynamic properties of the building. The paper presents the design of the test structure according to the new edition of the CSA A23.3-04 Design of concrete structures standard, the series of pseudo-dynamic tests simulating different levels of earthquake excitation consistent with the 2005 edition of the National building code of Canada, and the evaluation of the performance of the building. It is shown that the detailing requirements of CSA A23.3-04 are more than adequate to provide the ductility and overstrength expected.

Urban Railway Bridge Fast Evaluation Based on Cloud Computing

2011 ◽  
Vol 71-78 ◽  
pp. 4501-4505
Author(s):  
Ming Chen ◽  
Wan Zhou
Keyword(s):  
Neural Networks ◽  
Cloud Computing ◽  
Model Updating ◽  
Condition Assessment ◽  
Fe Model ◽  
Railway Bridge ◽  
Fast Evaluation ◽  
Railway Bridges ◽  
Computing Model ◽  
Bridge Condition Assessment

Although modern bridge are carefully designed and well constructed, damage may occur in them due to unexpected causes. Currently, many different techniques have been proposed and investigated in bridge condition assessment. However, evaluation efficiency of condition assessment has not been paid much attention by the researchers. A fast evaluation of the urban railway bridge condition based on the cloud computing is presented. In this paper dynamic FE model and Artificial neural networks technique is applied to model updating. The cloud computing model provides the basis for fast analyses. It was found that when applied to the actually railway bridges, the proposed method provided results similar to those obtained by experts, but can improve efficiency of bridge

Investigation of planing craft maneuverability using full-scale tests

2021 ◽  
pp. 147509022110303
Author(s):  
Kazem Sadati ◽  
Hamid Zeraatgar ◽  
Aliasghar Moghaddas
Keyword(s):  
Full Scale ◽  
Performance Characteristics ◽  
Forward Speed ◽  
Speed Reduction ◽  
Planing Craft ◽  
Full Scale Tests ◽  
Turning Maneuver

Maneuverability of planing craft is a complicated hydrodynamic subject that needs more studies to comprehend its characteristics. Planing craft drivers follow a common practice for maneuver of the craft that is fundamentally different from ship’s standards. In situ full-scale tests are normally necessary to understand the maneuverability characteristics of planing craft. In this paper, a study has been conducted to illustrate maneuverability characteristics of planing craft by full-scale tests. Accelerating and turning maneuver tests are conducted on two cases at different forward speeds and rudder angles. In each test, dynamic trim, trajectory, speed, roll of the craft are recorded. The tests are performed in planing mode, semi-planing mode, and transition between planing mode to semi-planing mode to study the effects of the craft forward speed and consequently running attitude on the maneuverability. Analysis of the data reveals that the Steady Turning Diameter (STD) of the planing craft may be as large as 40 L, while it rarely goes beyond 5 L for ships. Results also show that a turning maneuver starting at planing mode might end in semi-planing mode. This transition can remarkably improve the performance characteristics of the planing craft’s maneuverability. Therefore, an alternative practice is proposed instead of the classic turning maneuver. In this practice, the craft traveling in the planing mode is transitioned to the semi-planing mode by forward speed reduction first, and then the turning maneuver is executed.

Full-scale tests of the trash racks of the Kapchagai hydroelectric station

1984 ◽  
Vol 18 (4) ◽  
pp. 166-170
Author(s):  
A. L. Rakhmanova ◽  
I. O. Rybak
Keyword(s):  
Hydroelectric Station ◽  
Full Scale ◽  
Full Scale Tests
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