Remote Hybrid Testing of Asymmetric Structures under Earthquake Excitation

2013 ◽  
Vol 639-640 ◽  
pp. 1168-1174
Author(s):  
Yun Lei Fan ◽  
Yan Xiao ◽  
Yu Rong Guo ◽  
Tao Yuan
Keyword(s):  
Dynamic Testing ◽  
Earthquake Excitation ◽  
Hybrid Testing ◽  
Asymmetric Structures ◽  
Testing Method ◽  
Bridge Structures ◽  
Frame System ◽  
Control Principle ◽  
And Control ◽  
Representative Ground

Based on the pseudo-dynamic testing method and substructure technique, a remote hybrid dynamic testing method for asymmetric-plan buildings considering torsional effects is described. Besides, this paper presents the method and control principle for testing substructures in a single-story frame system under loading due to eccentric lateral responses of superstructure to earthquake motion. Several validated simulation tests of an asymmetric bridge system have been conducted successfully based on the remote testing platform NetSLab and the crossed-response of torsional and translational vibration of bridge structures under three representative ground motions was studied.

scholarly journals Regulation of dynamic characteristics of bridge spans in the conditions of the changing impact of the temporary moving load

2021 ◽  
Vol 1 ◽  
pp. 4-19
Author(s):  
Vladimir Mikhailovich Kartopoltsev ◽  
◽  
Andrey Vladimirovich Kartopoltsev ◽  
Keyword(s):  
Dynamic Characteristics ◽  
Moving Load ◽  
Musical Instrument ◽  
Oscillatory Process ◽  
Natural Oscillations ◽  
Structural Content ◽  
Bridge Structures ◽  
National Programs ◽  
And Control ◽  
Bridge Spans

It is known that an unregulated structure is likened to an unadjusted musical instrument [7]. The adjusted dynamic stress-strain state of the bridge spans will be adequate to the parameters of the design and operational state as a result of the introduction of regulation and control of fl uctuations in the conditions of the changing impact of the temporary mobile load. Methods for regulating dynamic characteristics by changing the frequency of natural oscillations of the system, taking into account energy dissipation, as well as introducing into the oscillatory process a transformed form of intense oscillations in the process of artifi cial or selective resonance, in which the oscillations of the system either damp or cease to be dangerous, are especially carefully considered. Attention is focused on the infl uence of the defectiveness of the roadway with an increase in the mass and speed of a temporary moving load. For this purpose, a classifi er of bridge deck defects has been developed to clarify the boundaries of the eff ect of a defect on the dynamic operation of a structure [1, 3]. Analysis of the structural content and criteria for determining shows the insuffi ciency of the components assessing the eff ect of the temporary mobile load on the span under non-stationary oscillations, and also reveals contradictions in the assessment of the dynamic additive . The practical use of the research results is advisable by the Ministry of Transport Construction in the implementation of state national programs and projects for improving structures, calculation methods, design and operation of bridge structures

scholarly journals Calculating static deformations from quick-release accelerograms

1990 ◽  
Vol 23 (4) ◽  
pp. 239-253
Author(s):  
Bruce M. Douglas ◽  
Emmanuel A. Maragakis ◽  
Bhabananda Nath
Keyword(s):  
Dynamic Testing ◽  
Highway Bridges ◽  
Correction Method ◽  
Step Function ◽  
Base Line ◽  
Quick Release ◽  
Testing Method ◽  
Scale Test ◽  
Measured Displacement ◽  
Dynamic Excitations

This paper outlines a new method for performing base line corrections on accelerograms generated by the quick-release dynamic testing method. These accelerograms are produced when highway bridges are subjected to dynamic excitations by initially deforming the bridge structure and subsequently quick-releasing the loads causing the deformation. This base line correction method is developed in such a way that the step function character of the quick-release base line is preserved. It is this feature which allows the static deformations of the structure to be recovered by integrating the accelerograms. The reliability of the method is demonstrated by a series of laboratory measurements comparing the displacement time series obtained by double integration to independently measured displacement responses. These laboratory comparisons indicate that the offset displacements are accurate to within about 5% on the average. The method was applied on accelerograms obtained during a quick-release full-scale test of the Meloland Road Overcrossing, and some examples of this application are presented.

scholarly journals Research on the Computer Software Testing Method Based on Multiple Platforms

2020 ◽  
Vol 2 (3) ◽  
Author(s):  
Yongfang Sun ◽  
Jianjun Li
Keyword(s):  
Software Development ◽  
Software Testing ◽  
Computer Software ◽  
Test Accuracy ◽  
Testing Methods ◽  
Modern Life ◽  
Testing Method ◽  
Software Companies ◽  
And Control

Informationization plays an important role in modern life and production. And various software is one of the bases for it. Before it goes into service, software needs to go through many steps, including software development, design, etc. In software development, test is the key to identify and control bugs and errors in the software. Therefore, software companies often test the software to ensure that it is qualified. In recent years, more attention has been paid to a multi-platform computer software testing method, which can make up for defects in traditional testing methods to improve test accuracy. Firstly, this paper illustrates the connotation and features of software testing. Secondly, common software testing platforms and their requirements are analyzed. Finally, this paper proposes software testing method based on multiple platforms.

Numerical and Experimental Assessment of the Highway Arch Viaduct

2015 ◽  
Vol 769 ◽  
pp. 252-259
Author(s):  
Jan Bencat ◽  
Maria Stehlikova ◽  
Milan Skarupa
Keyword(s):  
Dynamic Testing ◽  
Highway Bridges ◽  
Structural Condition ◽  
Traffic Load ◽  
Analytical Models ◽  
Mode Shapes ◽  
Bridge Structure ◽  
Modal Damping ◽  
Bridge Structures ◽  
And Performance

Full–scale dynamic testing of bridge structures can provide valuable information on the service behavior and performance of structures. With the growing interest in the structural condition of highway bridges, dynamic testing can be used as a tool for assessing the integrity of bridges. From the measured dynamic response, induced by instructed passing trucks, modal parameters (natural frequencies, mode shapes and modal damping values) and system parameters (stiffness, mass and damping matrices) are obtained. These identified parameters can then be used to characterize and monitor the service of the bridge structure in the future. Analytical models of the structure can also be validated using these parameters [1,2]. The paper presents a procedure for estimating the traffic load bearing capacity of the steel arch highway viaduct Bridge Structure 205 (DC1–9, 755 m) constructed on Highway D1 in Nord Slovakia (Fig. 1) over the natural hollow basin via dynamic tests of the viaduct structures.

Dynamic testing of a corrugated steel arch bridge

2008 ◽  
Vol 35 (3) ◽  
pp. 246-257 ◽  
Author(s):  
Zbigniew Manko ◽  
Damian Beben
Keyword(s):  
Vibration Frequency ◽  
Dynamic Load ◽  
Critical Speed ◽  
Dynamic Testing ◽  
The Other ◽  
Steel Plates ◽  
Highway Bridge ◽  
Dynamic Coefficients ◽  
Bridge Structures ◽  
Load Tests

The paper presents the results and conclusions of dynamic load tests that were conducted on a highway bridge over the Gimån River in Sweden made of Super Cor corrugated steel plates (CSP), the first bridge of this type in Scandinavia. The critical speed magnitudes, dynamic coefficients, velocity vibration, and vibration frequency are determined in the paper. Conclusions drawn from the tests can be most helpful in the assessment of the behaviour of this type of corrugated plate – soil bridge. In consideration of the application of this type of structure in the case of small-to-medium span bridges, the conclusions from this research cannot yet be generalized to all types of such solutions. The application details with respect to all types of such bridge structures would require additional analysis (field and model tests and calculations) on the other types of soil–steel bridges.

Analysis and Control of the 1st Order Interior Noise and Vibration Induced by Driveline Imbalance for 4WD Vehicle

2016 ◽  
Author(s):  
Yuanfeng Xia ◽  
Jian Pang ◽  
Rui Liu ◽  
Wenjuan Li ◽  
Jianchun Xu
Keyword(s):  
The Body ◽  
Influence Coefficient ◽  
Vehicle Interior ◽  
Single Plane ◽  
Acoustic Cavity ◽  
Testing Method ◽  
Sensitivity Theory ◽  
Influence Coefficient Method ◽  
And Control ◽  
Coefficient Method

Based on the influence coefficient method of the single-plane and multi-plane imbalance, an experimental method of a 4WD driveline system imbalance is proposed. A sensitivity theory and a testing method of influence of the 4WD driveline system imbalance on the vehicle interior 1st order vibration and noise are proposed. According to the influence coefficient method of the single plane, this paper puts forward an imbalance separation method for the driveline components, especially the imbalance separation between the driveshaft and the axle. Based on the problems and phenomena of the 1st order interior vibration and noise induced by the driveline imbalance transferring through the body floor and the interior acoustic cavity, the driveline imbalance sensitivity, the dynamic imbalance of the driveshaft and the driveline system are analyzed separately. Finally, the control methods of the dynamic imbalance and sensitivity of the 4WD vehicle driveline system are provided.

Research on Transmission Control Unit Testing for AMT of Heavy-Duty Commercial Vehicle

2012 ◽  
Vol 479-481 ◽  
pp. 899-902 ◽  
Author(s):  
Yu Long Lei ◽  
Hua Bing Zeng ◽  
Xin Jiang
Keyword(s):  
Commercial Vehicle ◽  
Control Strategies ◽  
Control Unit ◽  
Test Case ◽  
Unit Testing ◽  
Heavy Duty ◽  
Testing Method ◽  
Program Designer ◽  
And Control ◽  
Control Layer

Hardware-in-the-loop simulation model of AMT of heavy duty commercial vehicle is built in this paper. The testing methods of TCU underlying and control layer are brought up and a corresponding test case is added based on actual needs. This paper provides an effective testing method for a TCU program designer to modify control strategies.

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