损伤拉索的垂度效应分析

发布时间：2018-11-25 19:33

【摘要】：首先引入损伤程度、损伤位置及损伤范围3个参数,用以描述拉索损伤状态的特征,然后建立损伤拉索垂度效应分析的方程。在此基础上,采用数值计算方法分析了不同几何形态、不同损伤状态的拉索垂度效应受纵横比和弦向长度等相关参数的影响规律,对比了垂度的精确计算值和垂度公式计算值间的误差。结果表明:垂度随纵横比变化的敏感区间为[0.997,1.003],在此区间内损伤拉索跨中垂度逐渐增大,但是损伤前后垂度增长幅度逐渐减小;纵横比在[0.995,0.999)区间内,纵横比越大,误差越大;同一纵横比下,弦向长度越大,则采用现有垂度公式计算损伤拉索垂度所产生的相对误差就越大,但是最大相对误差小于1.7%;弦向长度为300m、纵横比为0.997的拉索在损伤范围内垂度增量小于0.35m,相对误差小于1.2%,说明现有垂度公式具有较高计算精度。
[Abstract]:Firstly, the damage degree, damage location and damage range are introduced to describe the characteristics of cable damage, and then the equation of damage cable sag effect is established. On the basis of this, the sag effect of cables with different geometry and different damage states is analyzed by numerical method, which is influenced by the relative parameters, such as aspect ratio and chord length, etc. The error between the exact calculation value of sag and the calculated value of sag formula is compared. The results show that the sensitivity range of sag with aspect ratio is [0.9971.003], in which the sag of damaged cable span increases gradually, but the amplitude of sag increases gradually before and after damage. The greater the aspect ratio is, the greater the error is. Under the same aspect ratio, the larger the chord length is, the greater the relative error will be in calculating the sag of damaged cable by using the existing sag formula, but the maximum relative error is less than 1.7. The sag increment of the cable with a chord length of 300m and a aspect ratio of 0.997 is less than 0.35m and the relative error is less than 1.2, which indicates that the existing formulas of sag have higher calculation accuracy.
【作者单位】：南京林业大学土木工程学院;宁波市交通发展前期办公室;
【基金】：住房和城乡建设部科学技术计划项目(2010K28) 江苏高校优势学科建设工程资助项目(PAPD)
【分类号】：TU31;U441

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