以某斜拉桥为研究背景，对风载作用下斜拉桥拉索疲劳可靠性和疲劳损伤进行分析。首先依据当地风速统计资料获得桥梁模拟点的风速时程，对影响桥梁抖振作用下的风荷载进行计算；然后采用自编的风桥动力响应程序，得到风荷载作用下部分斜拉索的应力时程；基于构件累积损伤理论，得到拉索的疲劳可靠度和疲劳损伤。结果表明：风荷载对长索的损伤影响程度较短索大，抖振作用下，拉索的可靠度都满足使用要求，疲劳寿命满足设计要求，拉索不会破坏。%Taking a cable-stayed bridge as the research background,the fatigue reliability and fatigue damage of stay cable were analyzed under the action of the wind load.First according to the statistics of the local wind speed to obtain the bridge simulate wind speed time history,the wind load of bridge buffet was calculated.Then using the wind bridge dynamic response includes program to get part stress of the cable under wind load.Based on the cumulative damage theory of the components to get the fatigue reliability and fatigue damage of stay cable.The results show that wind load on the long cable has bigger damage than short cable.Under the effect of buffet ,the reliability of cable meet the re-quirement and the fatigue life meet the design requirements,the cable will not damage.
展开▼
