（中国建筑科学研究院建筑结构研究所，北京 100013）

［摘要］现行国家规范（规程）仅对预应力次内力中的次弯矩和次剪力的计算方法做了规定，而对次轴力的计算并未做明确规定，只给出了相应的施工技术措施以减小超静定结构中次轴力对预应力构件的不利影响。推导了超静定结构中预应力次轴力的计算方法，并分析了柱截面刚度、梁的弹性模量和截面面积、梁跨度、层高、不同张拉方式等对其的影响。

［关键词］次轴力；侧向约束；超静定结构；预应力混凝土

Calculation method and influencing factors to secondary axial force for prestressed concrete frame beam

Fan Meiling, Shao Guangxin, Zhu Wei

（Institute of Building Structures, China Academy of Building Research, Beijing 100013, China）

Abstract:The existing national codes or specifications only give the methods how to calculate the secondary moment and shearing force in prestressed concrete structures, and the construction measures to reduce the bad influences of the secondary axial force on the prestressed members of statically indeterminate structures. While the calculation method of the secondary axial force is not mentioned. The calculation method of the secondary axial force is deduced, and the effects of the stiffness of columns, elastic module and section area of beams, span of beam, high of layer and tension manners on the secondary axial force are analyzed.

Keywords:secondary axial force; lateral constraint; statically indeterminate structure; prestressed concrete

作者简介：范美玲，硕士，研究员，Email:fanmeiling@cabrtech.com。