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（中國(guó)建筑科學(xué)研究院建筑結(jié)構(gòu)研究所，北京 100013）

［摘要］現(xiàn)行國(guó)家規(guī)范（規(guī)程）僅對(duì)預(yù)應(yīng)力次內(nèi)力中的次彎矩和次剪力的計(jì)算方法做了規(guī)定，而對(duì)次軸力的計(jì)算并未做明確規(guī)定，只給出了相應(yīng)的施工技術(shù)措施以減小超靜定結(jié)構(gòu)中次軸力對(duì)預(yù)應(yīng)力構(gòu)件的不利影響。推導(dǎo)了超靜定結(jié)構(gòu)中預(yù)應(yīng)力次軸力的計(jì)算方法，并分析了柱截面剛度、梁的彈性模量和截面面積、梁跨度、層高、不同張拉方式等對(duì)其的影響。

［關(guān)鍵詞］次軸力；側(cè)向約束；超靜定結(jié)構(gòu)；預(yù)應(yīng)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

作者簡(jiǎn)介：范美玲，碩士，研究員，Email:fanmeiling@cabrtech.com。