In 2004, Yang and co-workers proposed the extraction of bridge frequencies from the dynamic response of a moving test vehicle [Y B Yang, C W Lin and J D Yau, Extracting bridge frequencies from the dynamic response of a passing vehicle, J Sound Vib 272 (2004) 471–493] and verified the technique by a field test [C W Lin and Y B Yang, Use of a passing vehicle to scan the bridge frequencies — An experimental verification, Eng Struct 27(13) (2005) 1865–1878] This technique was extended to construction of mode shapes [Y B Yang, Y C Li and K C Chang, Constructing the mode shapes of a bridge from a passing vehicles: A theoretical study, Smart Struct Syst 13(5) (2014) 797–819] and damage identification of bridges It was referred to as the indirect method for bridge measurement because no vibration sensors are needed for installation on the bridge, but it only requires one or few vibration sensors on the test vehicle When compared with the conventional direct method that relies fully on the

State-of-the-Art Review on Modal Identification and Damage Detection of Bridges by Moving Test Vehicles

An analytical-numerical method is presented that can be used to determine the dynamic behavior of beams, with different boundary conditions, carrying a moving mass. This article demonstrates the transformation of a familiar governing equation into a new, solvable series of ordinary differential equations. The correctness of the results has been ascertained by a comparison, using finite element models, and very good agreement has been obtained. Furthermore, the article shows that the response of structures due to moving mass, which has often been neglected in the past, must be properly taken into account because it often differs significantly from the moving force model.

Closure of "Numerical Solution for Response of Beams With Moving Mass"

Measuring bridge frequencies by a test vehicle in non-moving and moving states

The dynamic response of a simply supported box girder bridge due to a vehicle moving across the span is presented. The effect of the randomly varying dynamic force generated by the vehicle moving over a rough bridge deck is considered in the analysis. A comparison is made of results obtained by modeling the vehicle and vehicle-pavement interaction as a single unsprung mass and as a concentrated time-dependent force. A statistical analysis of the results shows that peak impact factors for deflection, moments, and shear are considerably greater than those normally prescribed in bridge codes, especially when the vehicle is moving at high speeds. The effect of vehicle mass is also more significant at higher speeds.

Closure of "Bridge Vibrations Due to Vehicle Moving Over Rough Surface"

The vehicle scanning method (VSM), an indirect approach for bridge measurement, has attracted intensive attention since it was proposed. By this method, a moving test vehicle is employed to detect ...

State-of-the-Art of Vehicle-Based Methods for Detecting Various Properties of Highway Bridges and Railway Tracks

The response of the contact point of the vehicle with the bridge, rather than the vehicle itself, is proposed for modal identification of bridges by a moving test vehicle. To begin, approximate closed-form solutions were derived for the vehicle and contact-point responses, and they were verified by finite element solutions. The contact-point acceleration is born to be free of the vehicle frequency, an annoying effect that may overshadow the bridge frequencies in case of rough surface. From the frequency response function (FRF) of the vehicle with respect to the contact point, it was shown that the contact-point response generally outperforms the vehicle response in extracting the bridge frequencies because it could identify more frequencies. In the numerical simulations, the contact-point response was compared with the vehicle response for various scenarios. It is concluded that in each case, say, for varying vehicle speeds or frequencies, for smooth or rough road surfaces, with or without existing traffi...

Contact-Point Response for Modal Identification of Bridges by a Moving Test Vehicle

An effective means for damage detection of bridges using the contact-point response of a moving test vehicle

Bridge damping identification by vehicle scanning method

Vehicle Scanning Method for Bridges

This paper is concerned with the lateral and torsional coupled vibration of monosymmetric I-beams under moving loads. To this end, a train is modeled as two subsystems of eccentric wheel loads of constant intervals to account for the front and rear wheels. By assuming the lateral and torsional displacements to be restrained at the two ends of the beam, both the lateral and torsional displacements are approximated by a series of sine functions. The method of variation of constants is adopted to derive the closed-form solution. For the most severe condition when the last wheel load is acting on the beam, both the conditions of resonance and cancellation are identified. Once the condition of cancellation is enforced, the resonance response can always be suppressed, which represents the optimal design for the beam. Since the condition for suppressing the torsional resonance is exactly the same as that for the vertical resonance, this offers a great advantage in the design of monosymmetric I-beams, as no disti...

Bin Zhang

Papers

Contact-Point Response for Modal Identification of Bridges by a Moving Test Vehicle

An effective means for damage detection of bridges using the contact-point response of a moving test vehicle

Bridge damping identification by vehicle scanning method

Vehicle Scanning Method for Bridges

Resonance and Cancellation in Torsional Vibration of Monosymmetric I-Sections Under Moving Loads