（1 东南大学，南京 210096； 2 山东建筑大学，济南 250014）

［摘要］就预应力混凝土结构中的综合内力、主内力和次内力给出其物理意义的解释。通过对综合内力法分析，提出改进综合内力法，该法适用于构件承载力的计算和正常使用极限状态的验算；较综合内力法逻辑更为严密；较次内力法便于理解，不用计算次内力，而且自动包含次轴力对结构的影响。有利于预应力混凝土结构的推广与应用。

［关键词］预应力混凝土结构；预应力；次内力；综合内力；改进综合内力法

Method of advanced resultant internal forces for design of modern prestressed concrete structures

Li Yuying 1，Fu Chuanguo 2，Liang Shuting 1，Sun Xiuli 1

（1 Southeast University, Nanjing 210096, China; 2 Shandong Architectural and Civil Engineering Institute, Jinan 250014, China）

Abstract:The definition of resultant internal forces, first internal forces and secondary internal forces are presented. Modifying the method of resultant internal forces, the method of advanced resultant internal forces is obtained firstly. It is a uniform method for design of prestressed reinforced concrete structures. This method is suitable than for ultimate limit state analysis and serviceability limit state analysis. The method  is easier tobe understood than the method of secondary internal forces and the method of resultant internal forces.

Keywords:prestressed RC structure；prestressing；secondary internal forces；resultant internal forces；advanced resultant internal forces method

作者简介：李玉莹，博士生，一级注册结构师，Email:lyy7705@163.com。