摘要
在预应力工程实践中,混凝土中的预应力筋有时需布置成空间曲线索形。其预应力摩擦损失的计算应该按照空间三维曲线的曲率转角来计算。本文推导了空间索线预应力筋的摩擦损失计算公式,推荐了简化近似计算方法。通过若干实例的对比计算,表明不考虑三维效应的影响可能存在较大的误差;而推荐的简化方法则简便且精度较高。
The calculation of the prestress loss due to friction of the prestressing tendon with a profile of spatial curves is studied in the paper. Sometimes in the engineering practice, the profile of prestressing tendon is needed to be in spatial curves. Hie prestress loss due to friction should be calculated based on the curvatures of the spatial curves. A formula to calculate the prestress loss due to friction for such tendons and simplified formulas are proposed. Several practical examples are shown that the current calculating the friction loss of prestress due to friction may cause unacceptable error. It will be seen from this that the proposed formula is reliable and efficient.
出处
《土木工程学报》
EI
CSCD
北大核心
2003年第6期26-30,共5页
China Civil Engineering Journal
关键词
预应力混凝土
摩擦损失
空间曲线轮廓
prestressed concrete structures, loss due to friction, profile of spatial curves
