论文部分内容阅读
以某大跨斜拉桥为工程背景,对随机车载与风载联合作用下的斜拉索疲劳可靠性进行了分析。首先,依据交通调查数据,建立随机交通荷载模型,基于桥位处多年风速统计资料,建立大桥风载概率模型;然后,采用自编的风-车-桥动力响应分析程序,实现随机车载与风载联合作用下的拉索应力谱计算分析;最后,基于累积损伤理论和Monte-Carlo法开展拉索的疲劳可靠度和疲劳寿命分析。研究结果表明:风载对斜拉索疲劳可靠度影响显著,且该影响由短索到长索呈不断增大的趋势;考虑车载-风载联合作用的拉索疲劳寿命较仅考虑车载的情况下降2%～63%,平均达50%。
Taking a long-span cable-stayed bridge as engineering background, the fatigue reliability of the stay-cable under the combined effect of random vehicle load and wind load is analyzed. Firstly, based on the traffic survey data, a stochastic traffic load model is established. Based on the multi-year wind speed statistic data at the bridge site, the probability model of the bridge’s wind load is established. Then, by using the self-compiled wind-vehicle-bridge dynamic response analysis program, Finally, based on cumulative damage theory and Monte-Carlo method to carry out the cable fatigue reliability and fatigue life analysis. The results show that: the wind load has a significant impact on the fatigue reliability of the stay cable, and the effect tends to increase from the short cable to the long cable; the fatigue life of the cable considering the combined effect of vehicle-wind load and load is more than that of the vehicle Decline of 2% to 63%, an average of 50%.