部分预应力砼连续梁的弯矩－曲率分析法

推导普遍适用的部分预应力砼梁截面的弯矩－轴力－曲率的关系．基于砼、预应力筋的和非预应力筋的应力－应变关系的非线性和超静定结构的次弯矩，计算不同配筋的边跨梁和中跨梁．计算结果表明，配筋指标在０．１～０．２５范围内，梁具有良好的延性和承载能力；提高有效预应力和相应减小预应力筋面积，能提高梁的延性．

Analysis of Partially prestressed Concrete ContinuousBeam by Bending Moment-Curvature Method

With respect to a partially prestressed concrete beam, the relation between bending monent-axialforce-curvature of its section is derived for general use. Based on the nonlinearity of stress-strain relation between concrete, prestressed reinforcement and non-prestressed reinforcement as well as the the secondarymoment of statically indeterminate structure, a calculation is made on end-span beam and intermediate-spanbeam with different reinforcement. As shown by the result of calculation, a beam with a reinforcement indexranging from 0. 1 to 0. 25 shows a good ductility and load-carrying capecity; its ductility improves improvedductility with the increase of effective prestress and the corresponding decrease of its area.