Spatial gust impact analysis on safety and comfort of a train crossing cable-stayed bridge combining statistical method

Abstract

In order to study the safety and the comfort of high-speed trains running on a single-tower cable-stayed bridge under spatial gust, a dynamic model of wind-train-bridge analysis model is built based on the autoregressive method, the multi-body dynamics method and the finite element method. On this basis, the influence of spatial gust model loading, the suspension parameters change, wind attack angle and speed on the train-bridge system are analyzed by combining the time/frequency domain analysis and statistical methods. The results show that the spatial gust environment is one of the most important factors affecting safety and comfort and can make the calculation result tend to be conservative and more conducive. The response changes caused by K_py, K_px and K_sx changes are nearly linear, while K_sy shows nonlinear characteristics and the most sensitivity. Wind attack angle at 75° and 90°has the greatest influence on the vehicle-bridge system. For ride comfort index, when pre-set wind speed (α=75°) reaches 20 m/s, the vertical acceleration firstly exceeds the limit value;when wind speed (α=90°) reaches 21.5 m/s, the lateral acceleration firstly exceeds the limit value, and the ride comfort of the vehicle cannot be guaranteed. For running safety index, when pre-set wind speed (α=75°) reaches 24.6 m/s, the wheel unloading coefficient firstly exceeds the limit;when pre-set wind speed (α=90°) reaches 24.5 m/s, the derailment coefficient firstly exceeds the limit, and the running safety cannot be guaranteed. The results can provide a suitable reference for the safe and stable operation of trains on the bridge.

Keywords

wind-train-bridge dynamic system / high-speed train / crosswind environment / single-tower cable-stayed bridge / running safety / running stability

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