摘要
为估算体外预应力梁的长期性能,基于混凝土层模型,将体外预应力混凝土梁简化成平面杆系结构,采用步进计算方法进行时随分析,考虑力筋应力增量、二次效应、材料的收缩、徐变和松弛等因素.编制时随分析程序,对体外预应力梁和内置无粘结梁的预应力长期损失进行对比.结果表明,跨高比较小的体外预应力梁与体内无粘结预应力梁之间预应力长期损失差别很小,设计中可沿用已有的无粘结预应力长期损失计算公式.
In order to estimate their long-term performance, the externally prestressed beams are modeled as an assemblage of plane frame members based on fiber model, and then a step-by-step method is established to perform the time-dependent analysis. Tendon stress increment, second-order effect, shrinkage, creep and relaxation of materials are included in the analysis. A computer program is developed to perform the analysis method, and a comparative analysis is carried out on the long-term prestressing losses of RC beams with external or unbonded tendon. The result shows that there is little difference between externally prestressed and unbonded prestressed beams with small span-depth ratio in long-term prestress losses, and the current calculation method for unbonded prestressing can be adopted in externally prestressed structure design.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2009年第3期137-140,共4页
Journal of Harbin Institute of Technology
基金
上海市城乡建设和交通委员会资助项目(B05043)
关键词
体外预应力
时随分析
层模型
步进计算
external prestressing
time-dependent analysis
fiber model
step-by-step method
作者简介
熊学玉（1962～），男，教授，博士生导师．xiong_xueyu@tjpec．com
