摘要
索穹顶结构的刚度是由索系预应力实现的,预应力损失对结构的安全性具有重要影响,而环索与撑杆相连的索撑节点设计与施工是保证环索实现预应力有效传递的关键技术。以内蒙古伊旗全民健身体育中心大跨度索穹顶结构工程为背景,研发了引入滑动轴承的新型索撑节点,从本质上改变了节点的受力特性,从而减小摩擦损失。通过分析索撑节点的几何构造,对预应力摩擦损失的计算方法进行研究。采用ANSYS对环索和索撑节点进行带摩擦的非线性接触有限元分析,通过模型试验监测数据反算预应力损失,将设计计算结果与实测数据分析结果进行对比。根据研究结果对索穹顶的索撑节点提出如下建议:索撑节点的加工制作应采用精密加工,确保节点几何尺寸严格满足设计要求;在保证加工制作精度和施工质量的情况下,索撑节点预应力损失设计取值为3%～4%。
The stiffness of the cable dome structure is provided by the initial prestressing force.The prestressing force loss has an serious influence on the safety of the structure.The design and construction of the cable-strut joint is the key technique to ensure the smooth sliding of loop cable and the efficient transfer of prestressing force to loop cable.To build the National Fitness Center in Ejin Horo banner,Inner Mongolia,a new-type cable-strut joint including a sliding bearing is invented.It essentially changes the mechanical characteristics of the joint and can decrease the prestressing force loss.This paper analyses geometrical constitution of cable-strut joint and makes research to the method for calculating the prestressing force loss of the loop cable.The nonlinear contact friction finite element analysis of the loop cable and cable-strut joint was carried out with ANSYS.The prestressing force loss was calculated through the monitored data of the model experiment.The computed results are compared with the actual monitored data,and the causes for large monitored pretressing force loss were studied.The following suggestions are provided for cable-strut joint of cable dome： the constructional detail of the cable-strut joint should be improved to diminish the prestressing force loss;the prestressing force loss value of cable-strut joint is preferable to be 3%~4%,meanwhile the cable-strut joint should be made precisely and the construction should be controlled strictly.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2012年第4期46-53,共8页
Journal of Building Structures
基金
国家自然科学基金重点项目(51038006)
北京工业大学城市与工程安全减灾教育部重点实验室项目
北京大学湍流与复杂系统国家重点实验室开放课题
北京市学术创新团队项目
关键词
索穹顶结构
索撑节点
滑动轴承
模型试验
接触分析
预应力损失
cable dome
cable-strut joint
sliding bearing
model test
contact analysis
prestressing force loss
