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随着大跨度连续刚构桥跨径的增长,结构刚度越来越小,尤其是在悬臂施工阶段结构较柔,由风荷载引起的桥梁驰振稳定问题不容忽视,有必要对大跨度连续刚构桥进行驰振可靠性评价。本文以北山大桥为例,首先通过风洞试验来定性识别驰振发生的可能性。然后,基于现有结构可靠性理论,以桥梁驰振临界风速为结构抗力变量,以桥址处随机风速为荷载变量,建立极限状态方程,通过极限状态方程建立起大跨度连续刚构桥驰振的可靠性分析模型。文中介绍了一种新的确定桥梁驰振稳定失效概率的可靠度计算方法。最后,运用本文所确定的评价方法对北山大桥进行了驰振失效概率计算。
With the growth of span of long-span continuous rigid frame bridge, the stiffness of the structure is getting smaller and smaller, especially when the cantilever construction stage is relatively soft and the stability of bridge vibration caused by wind load can not be neglected. Therefore, Bridge reliability evaluation Chi Chi. Taking Beishan Bridge as an example, this paper firstly qualitatively identifies the possibility of galloping by wind tunnel test. Then, based on the existing structural reliability theory, the critical wind speed of the bridge is taken as the structural resistance variable and the stochastic wind speed at the bridge site is used as the load variable to establish the limit state equation. The limit state equation is used to establish the long-span continuous rigid frame bridge vibration Reliability Analysis Model. In this paper, a new method for calculating the reliability of the bridge is proposed. Finally, using the evaluation method determined in this paper, the probability of galloping failure is calculated for Beishan Bridge.