Bridge vortex-induced vibration (VIV) refers to the vertical resonance phenomenon that occurs in a bridge when pulsating wind passes over it and causes vortices detach. In recent years, VIV events have been observed numerous long-span bridges, leading fatigue damage structure posing risks driving safety. The advancement of technologies such as structural health monitoring (SHM), machine learnin...

For the purpose of splicing widening bridges without interrupting traffic in expressway reconstruction and extension projects, different types anti-differential disturbance concrete (ADC) were developed. This paper experimentally investigated mechanical performance ADC under influence traffic–vehicle coupling vibration. The experimental device, with one end fixed other vertically vibrated, was ...

The hinge joints of the assembled concrete multi-girder bridge (ACMGB) are main components transverse transmission loads and decline their capacity would lead to degradation cooperative working performance (TCWP) multi-beam system. As key this kind bridges, its severe result in single-girder-bearing phenomenon inducing collapse. In order detect TCWP timely, paper proposes a vibration-based moni...

A low stiffness makes long-span suspension bridges sensitive to loads, and this sensitivity is particularly significant for wind-induced nonlinear vibrations. In the present paper, vibrations of under combined effects static vortex-induced loads are explored using partial differential–integral equation that models plane bending motion bridges. First, we discretized through Galerkin method obtai...

The calculated dynamic behaviour of railway bridges during high-speed traffic differs from the actual its bearing structure. In case steel bridges, calculations often overestimate vibration responses and therefore lead to uneconomical results. This gap between calculation measurement constitutes a complex research issue, whereas consideration ballasted track in has major influence. Concerning d...

High speed trains are an indispensable part of rapid transportation systems in many countries. As the fastest means of transport on the ground, these trains are extremely sensitive to the terrain and track conditions. Geometrical irregularities and mechanical characteristics of the track, together with inconsistencies in the lane (including bridges that support the track) are considered importa...

manual citrus harvesting is commonly performing hard, expensive and time consuming. in this study, a factorial experiment with a completely randomized design in three replications was performed to find out the effect of frequency (three levels of 5, 7.5 and 10 hz), vibration time (three levels of 10, 15 and 20 seconds) on harvesting capacity and losses of thomson cultivar of orange. the results...

this research is carried out to design and manufacturing of lathe vibration tool and their tests. firstly, one-dimensional vibration tool is designed and made of the bending vibration mode. one-dimensional vibration tool with half piezoelectric rings is considered to excite the bending mode of tool. structure of vibration tool is designed in abaqus software about 20 khz and then is made with re...

background: deficiency of attention and concentration is one of great reasons of traffic incidents and it covers between 20 to 50 percent of events due to careless and mindedness. studies show that attention and concentration are considered as one of important cognitive components in safe driving. vibration is an important physical effect in all vehicles. till now has not been any organized stu...