全面考虑次内力影响的预应力混凝土框架梁承载力计算  

A method of calculating bearing capacity while considering the secondry force in prestressed concrete frame beam

作　　者：熊学玉[1,2] 李媛[1] 程琛[1] 

机构地区：[1]同济大学建筑工程系,上海200092 [2]同济大学先进土木工程材料教育部重点实验室,上海200092

出　　处：《四川建筑科学研究》2012年第1期5-8,共4页Sichuan Building Science

基　　金：上海市科委科技支撑计划(09231201102)

摘　　要：为保证预应力混凝土结构正截面承载力的可靠性,推导了全面考虑次内力影响的预应力混凝土框架梁承载力计算公式,并对在特定预应力筋线型下的单层单跨预应力混凝土框架梁的相关算例进行了讨论。得出了梁柱线刚度比是影响次轴力的一项重要指标,当柱梁线刚度比达到18时,对框架梁跨中承载力影响达到5.67%,不考虑次轴力影响是不合理不安全的结论。In order to ensure the relibity of normal section strength of PRC structure, a full account of the impact of sub-internal force beating capacity of prestressed concrete frame beam formulas them through the relevant examples under special circumstances are discussed. Concluded that beam-column linear stiffness of the impact sub-axial force ratio is an important indicator, when the beam line of stiffness ratio is 18, the ifluence of the bearing capacity of prestressed concrete frame bean is 5.67% ,does not consider sub-axial force effects are not unreasonable and unsafe.

关 键 词：预应力混凝土结构 框架梁 次内力 承载力 

分 类 号：TU378[建筑科学—结构工程]