损伤因素对单层平面索网结构受力性能影响  

Study on the Influence of Damages on the Static Behaviour of Single-Layer Plane Cable Net

作　　者：施刚[1] 左勇志[2] 郑敬杰[2] 

机构地区：[1]土木工程安全与耐久教育部重点实验室,清华大学土木工程系,北京100084 [2]北京市建筑工程研究院,北京100039

出　　处：《沈阳建筑大学学报（自然科学版）》2012年第5期788-795,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家十一五科技支撑计划重点项目(2006BAJ01A03-2)

摘　　要：目的为了解决单层平面索网结构在损伤条件下的工作性能,进而为结构安全性评价提供量化数据,研究了索初始应力、竖索横索索力比、带伤跨度等参数对索受力性能影响.方法运用经过试验验证的三维有限元模型,基于一个10×10单层平面索网,分析了预应力损失和锚固端破坏两种典型损伤及其可能的组合对结构受力性能的影响,并对主要设计参数进行了敏感性分析.结果在单索损伤的情况下,结构最大挠度增加不超过10%,最大索力增加小于5%.结论中部损伤对索网最大挠度和最大索力的影响要明显大于边上损伤;在现有的研究范围内,多索损伤对结构的影响可以通过叠加相应单索损伤的影响来估计.而且,损伤对结构受力性能的影响会随着索初始应力与索破断强度比值的增大而增大,随着竖索与横索索力比的增大而减小.Single-layer plane cable net may suffer various damages in its service life. Based on a typical 10 × 10 plane cable net, a verified finite element model is adopted to investigate the influence of typical damages, such as cable pre-stress loss, cable anchorage failure and their combinations. The sensitivity analysis on the major design parameters is carried out. The results indicate that, when there is only one cable damaged, the structure maximum deflection increases less than 10%, the maximum cable inner force increases less than 5 %, and the influence of the middle cable damage is more significant than those of the side ones ;the influence of multiple cable damages approximately equal to the summation of the influence of single cable dam- age. The parametric study also shows that the damage influence would increase with the increase of cable pre-tension to breaking force ratio, and the vertical to horizontal cable force ratio.

关 键 词：单层平面索网 损伤因素 敏感性分析 静力性能 

分 类 号：TU312.3[建筑科学—结构工程]