摘要
张弦结构体系中拉索的预应力损失会对张弦结构的安全性能产生严重影响。通过对张弦结构体系全寿命期间的预应力损失因素进行分析,包括:锚固损失、分批张拉损失、摩擦损失、松弛损失、徐变损失和温度损失,对各因素造成的预应力损失的计算方法和补偿措施进行论述。最后,建立了包括短期影响的且发生在安装阶段的预应力损失和长期影响的具有时变效应且发生在使用阶段的预应力损失两部分的张弦结构体系全寿命预应力损失模型,并通过算例分析得到在设计阶段需考虑第二类预应力损失、施工阶段需考虑第一类损失。
For cable-supported structures,prestress loss of cables has great influence on the structural bearing capacity and safety of the cable-supported structures. Factors of life cycle prestress losses in cable-supported structures were analyzed,including anchorage loss,batched tension loss,friction loss,relaxation loss,creep loss and temperature loss. Also,the calculation methods and compensation measures were stated in this paper. Prestress loss in the installation phase has a short-term effect,while prestress loss with time-varying effect in the normal usage phase has a long-term effect. The models of prestress losses in the two phases were established,and it was known with analysis of examples that the second sort of prestress loss should be considered in the design phase; and the first sort of prestress loss should be considered in the construction phase.
出处
《工业建筑》
CSCD
北大核心
2015年第8期25-29,138,共6页
Industrial Construction
基金
国家自然科学基金项目(51478310)
天津市建委科技项目(2014-1)
关键词
张弦结构
全寿命
拉索
预应力损失
cable-supported structures
life cycle
cable
prestress loss
