斜拉索风致动力疲劳损伤的研究

研究了斜拉索风致振动的疲劳损伤问题。首先，根据 Miner 线性累积损伤原理，给出了结构疲劳损伤的计算公式。其次，根据高周疲劳的特性，我们假设斜拉索的疲劳损伤符合 Basquin 疲劳估算模型。第三，在综合目前疲劳损伤既有研究的基础上，进一步提出评价不同风速和不同风攻角对斜拉索疲劳损伤影响的框架。最后，以松花江斜拉桥中的斜拉索为对象，基于动力时程法计算分析了在不同风速和不同风攻角情况下斜拉索上各节点的应力时程，再使用雨流计数法统计斜拉索的应力-应变循环历史，估算出在不同风速和不同风攻角下斜拉索的疲劳损伤。于是，定量地评价了在不同风速和不同风攻角对斜拉索疲劳损伤的影响。

Analysis of wind-induced fatigue damage of inclined cables

Following the linear accumulated damage theory proposed by Miner, the computational formula for structural fatigue damage was suggested. According to the high-cycle fatigue damage properties, it was hypothesized that the fatigue damage of inclined cable obeys the Basquin fatigue estimate model. On the basis of the available research results, the framework was proposed to study the influences of different wind speeds and different wind attack angles on the fatigue damage of inclined cable. Taking the inclined cable on Song Hua Jiang cable-stayed bridge as an example, the stress time histories at several positions on the cable under different wind speeds and different wind attack angles were calculated, the stress-strain cycle history of the inclined cable was obtained by resorting to the rain flow counting method, and then the influences of different wind speeds and different wind attack angles on the fatigue damage of inclined cable were examined.