摘要
高温蠕变对火灾下预应力钢结构和预应力混凝土结构的性能有重要影响。针对高温蠕变的特点,比较了预应力钢丝钢绞线的高温蠕变和蠕变率模型,并分析模型中温度和初应力对高温蠕变造成的影响。结果表明,进行火灾下预应力结构的预应力损失计算时,应当考虑高温蠕变的影响,并根据防火需要,计算合理的初预应力值,最终提高结构防火设计的安全性。
Thermal creep strain is important to the property of prestressing structure in fire. According to the property of thermal creep strain, the thermal creep strain models and thermal creep strain rate models of prestressing steel wire and stranded wire are compared, also the influences of temperature and stress ration are analyzed. It indicates that thermal creep strain should be considered when prestress loss of prestressing structure in fire is computed and initial prestress should be reasonable to improve structures＇ fire resistance.
出处
《钢结构》
2008年第1期6-9,共4页
Steel Construction
基金
国家自然科学基金资助项目(50678012)
北京市科委科技奥运专项资助项目(Z0005191040111)
北京市拔尖创新人才资助项目(05004311200601)
关键词
预应力钢丝钢绞线
高温蠕变
应力比
温度
prestress steel wire and stranded wire thermal creep strain stress ration temperature
