A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effect of damping on torsional-flexural frequencies of monosymmetric thin-walled beams scanned by moving vehicles
https://orcid.org/0000-0003-3149-4966
https://orcid.org/0000-0002-6915-269X
https://orcid.org/0009-0000-4544-560X
Highlights New general theory in closed-form solution for monosymmetric thin-walled beams subjected to a single-axle moving test vehicle focused on damping effect. Bi-directional damping is newly presented for vertical and torsional-flexural motions, since it is physically more realistic than uniform damping. Rocking contact response enables the torsional-flexural frequencies of the beam to be separated from the vertical ones, without knowing the mode shapes. Pollution effect of pavement roughness is mitigated by using the residual response of two connected vehicles.
Abstract This paper investigates the effect of damping on the torsional-flexural frequencies of monosymmetric thin-walled beams via the scanning by a single-axle test vehicle. A bi-directional damping model is adopted to account for the vertical and torsional-flexural motions of the beam, as they are mechanically uncoupled. To start, the closed-form solutions are derived for the vehicle, the beam and the vehicle-bridge contact responses. Based on the hypothesis of rigid cross sections, the rocking contact response is derived, which enables the torsional-flexural frequencies of the beam to be separated from the vertical ones. Both uniform and bi-directional damping properties are considered for the beam. The pollution effect of pavement roughness is overcome by using the residual contact response generated by two connected single-axle test vehicles. Through the parametric analysis, it is confirmed that: (1) the rocking contact response enables the first few torsional-flexural frequencies to be separately retrieved; (2) the damping ratio in each direction only affects the detectability of the frequencies, especially those of the high modes, in that direction for monosymmetric cross sections; (3) the residual contact response exhibits some robustness in identifying the frequencies of thin-walled beams with surface roughness and environmental noise effect; (4) a test vehicle moving in the side lane (with larger eccentricity from bridge's centerline) at a speed of 10 m/s (36 km/h) is recommended for the field test.
Effect of damping on torsional-flexural frequencies of monosymmetric thin-walled beams scanned by moving vehicles
https://orcid.org/0000-0003-3149-4966
https://orcid.org/0000-0002-6915-269X
https://orcid.org/0009-0000-4544-560X
Highlights New general theory in closed-form solution for monosymmetric thin-walled beams subjected to a single-axle moving test vehicle focused on damping effect. Bi-directional damping is newly presented for vertical and torsional-flexural motions, since it is physically more realistic than uniform damping. Rocking contact response enables the torsional-flexural frequencies of the beam to be separated from the vertical ones, without knowing the mode shapes. Pollution effect of pavement roughness is mitigated by using the residual response of two connected vehicles.
Abstract This paper investigates the effect of damping on the torsional-flexural frequencies of monosymmetric thin-walled beams via the scanning by a single-axle test vehicle. A bi-directional damping model is adopted to account for the vertical and torsional-flexural motions of the beam, as they are mechanically uncoupled. To start, the closed-form solutions are derived for the vehicle, the beam and the vehicle-bridge contact responses. Based on the hypothesis of rigid cross sections, the rocking contact response is derived, which enables the torsional-flexural frequencies of the beam to be separated from the vertical ones. Both uniform and bi-directional damping properties are considered for the beam. The pollution effect of pavement roughness is overcome by using the residual contact response generated by two connected single-axle test vehicles. Through the parametric analysis, it is confirmed that: (1) the rocking contact response enables the first few torsional-flexural frequencies to be separately retrieved; (2) the damping ratio in each direction only affects the detectability of the frequencies, especially those of the high modes, in that direction for monosymmetric cross sections; (3) the residual contact response exhibits some robustness in identifying the frequencies of thin-walled beams with surface roughness and environmental noise effect; (4) a test vehicle moving in the side lane (with larger eccentricity from bridge's centerline) at a speed of 10 m/s (36 km/h) is recommended for the field test.
Effect of damping on torsional-flexural frequencies of monosymmetric thin-walled beams scanned by moving vehicles
https://orcid.org/0000-0003-3149-4966
https://orcid.org/0000-0002-6915-269X
https://orcid.org/0009-0000-4544-560X
Highlights New general theory in closed-form solution for monosymmetric thin-walled beams subjected to a single-axle moving test vehicle focused on damping effect. Bi-directional damping is newly presented for vertical and torsional-flexural motions, since it is physically more realistic than uniform damping. Rocking contact response enables the torsional-flexural frequencies of the beam to be separated from the vertical ones, without knowing the mode shapes. Pollution effect of pavement roughness is mitigated by using the residual response of two connected vehicles.
Abstract This paper investigates the effect of damping on the torsional-flexural frequencies of monosymmetric thin-walled beams via the scanning by a single-axle test vehicle. A bi-directional damping model is adopted to account for the vertical and torsional-flexural motions of the beam, as they are mechanically uncoupled. To start, the closed-form solutions are derived for the vehicle, the beam and the vehicle-bridge contact responses. Based on the hypothesis of rigid cross sections, the rocking contact response is derived, which enables the torsional-flexural frequencies of the beam to be separated from the vertical ones. Both uniform and bi-directional damping properties are considered for the beam. The pollution effect of pavement roughness is overcome by using the residual contact response generated by two connected single-axle test vehicles. Through the parametric analysis, it is confirmed that: (1) the rocking contact response enables the first few torsional-flexural frequencies to be separately retrieved; (2) the damping ratio in each direction only affects the detectability of the frequencies, especially those of the high modes, in that direction for monosymmetric cross sections; (3) the residual contact response exhibits some robustness in identifying the frequencies of thin-walled beams with surface roughness and environmental noise effect; (4) a test vehicle moving in the side lane (with larger eccentricity from bridge's centerline) at a speed of 10 m/s (36 km/h) is recommended for the field test.
Effect of damping on torsional-flexural frequencies of monosymmetric thin-walled beams scanned by moving vehicles
Thin-Walled Structures ; 198
2024-01-25
Article (Journal)
Electronic Resource
English
Coupled Flexural-Torsional Vibrations of Thin-Walled Beams with Monosymmetric Cross-Section
| British Library Conference Proceedings | 2000
Torsional flexural steady state response of monosymmetric thin-walled beams under harmonic loads
| British Library Online Contents | 2014
Flexural-torsional buckling of monosymmetric columns
| Elsevier | 1992