非对称布置预应力筋理论不动点计算方法  

CALCULATION METHOD OF FIXED POINT IN THEORY UNDER ASYMMETRIC ARRANGEMENT OF PRESTRESSING TENDONS

作　　者：张善稳[1] 王修信[1] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096

出　　处：《建筑技术》2016年第4期324-327,共4页Architecture Technology

基　　金：国家自然科学基金项目(51378105)

摘　　要：围绕预应力筋布置为非对称形式的理论不动点位置的求解,根据预应力摩阻损失原理和几何关系的平衡条件推导出预应力筋曲线段理论不动点的通用公式。结合工程中常用的圆曲线和抛物线预应力筋形状,推导出这两类曲线的弯曲角θ、曲线长s和确定理论不动点的计算公式。通过工程算例的计算过程,表明了给出公式的简便实用性,并与有限元软件计算结果比较说明公式的准确性。Based on the friction principle and the equilibrium condition of geometry relationship, the formulas that can be used to determine the fixed point in theory are derived under the asymmetric arrangement of pre-stressing tendons in the tensioning stage. For the two commonly used curve tendons, circular curve and parabola, the formulas are given to calculate the bending angle θ and curve length s and the fixed point in theory （the stress balance point）. An engineering example is shown that the proposed formula is simple and practical, and it is accurate by compared with the Midas/Civil software method.

关 键 词：预应力混凝土工程 张拉阶段 非对称布置 理论不动点 

分 类 号：TU378.1[建筑科学—结构工程]