<p align="left">Stochastic dynamic analysis method for a cable-stayed bridge under combined actions of earthquake and waves

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (17) : 194-202.

Stochastic dynamic analysis method for a cable-stayed bridge under combined actions of earthquake and waves

MENG Sibo1, DING Yang1,2

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Abstract

Hydrodynamic pressure and wave force exerted on pile foundations and bearing platforms were solved with Morison equation, the radiation wave theory and the diffraction wave theory, respectively. Considering traveling wave effect, spatial coherence one and local site one, based on the virtual incentive method, the stochastic dynamic analysis method for a cable-stayed bridge under combined actions of multi-point earthquake and waves was proposed. Monte Carlo method was used to calculate effects of load nonlinearity on structural response. The applicability of the proposed method was verified through comparing its calculation results with those using Monte Carlo method. Effects of hydrodynamic pressure and wave force on root mean square of stochastic seismic response of a cable-stayed bridge were analyzed. The distribution trend and variation law of random response power spectral density of the cable-stayed bridge were studied. Results showed that the proposed method can consider the randomness of load, and calculate stochastic dynamic response of a cable-stayed bridge under combined action of earthquake and wave; hydrodynamic pressure’s rigid added mass can cause longitudinal internal force of the bridge’s underwater structure to grow; effects of hydrodynamic pressure and wave force on seismic response of the bridge tower’s underwater structure vary with variation of site conditions; when seismic input energy is distributed in a high frequency range, effects of hydrodynamic pressure and wave force on seismic response of the bridge tower’s underwater structure are larger.

Key words

cable-stayed bridge / multi-point ground motions / hydrodynamic pressure / wave / combined actions / stochastic response

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MENG Sibo1, DING Yang1,2.

Stochastic dynamic analysis method for a cable-stayed bridge under combined actions of earthquake and waves[J].

Journal of Vibration and Shock, 2020, 39(17): 194-202

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