熊学玉  赵  勇
    （同济大学预应力研究所 上海 200092）

[提要]  基于作者创立的约束次内力法进行对称双坡预应力混凝土框架分析，给出了对称双坡预应力变刚度梁单元的刚度矩阵及梁端的约束次内力的计算公式。计算实例表明，对于对称双坡预应力混凝土框架，不考虑轴向变形影响时往往会产生较大的计算误差。
[关键词]  预应力混凝土 变刚度梁 约束次内力法 双坡对称矩形梁

The symmetric double-sloping PRC-frame is analyzed on the basis of method for restraining secondary internal force advanced by the author. The calculating formulae of rigidity matrix and secondary internal force at the end of beam for prestressed element with varying rigidity are presented. The calculating example shows that the symmetric double-slopping PRGframe will produce biggish calculating error if the axial deformation is ignored.
Keywords:  prestressed concrete; varying rigidity; restraining secondary internal force; symmetric double-slopping beam; rectangle section