【摘要】 本文针对大跨度斜拉桥的特点 ,考虑了振型间的耦合效应 ,采用目标谱显式分解技术与动力增量平衡迭代算法分析大桥的抖振响应。在此基础上 ,采用首次超越破坏机制 ,考虑了大跨度斜拉桥抖振响应的动力可靠性问题。最后 ,以文中方法验算了某斜拉桥主梁的抗风动力可靠性。更多还原

【Abstract】 WT5BZ]Considering the characteristics of long_span cable_stayed bridge,the explicit decomposition technique for the wind velocity spectrum density matrix and the dynamic increment equilibrium iteration method are proposed to fulfill the time history analysis of the bridge buffeting response.On the basis of the results ,the first excursion mechanism is adopted to analyze the dynamic reliability for buffeting of long_span cable_stayed bridge.Numerical example is presented to show the advantage of this method and to verify the dynamic reliability of a cable_stayed bridge under wind_loads. [WT5HZ]更多还原