摘要
从混凝土和钢筋 (预应力筋和非预应力筋 )的非线性本构关系出发 ,推导了双筋工形预应力混凝土截面在加载过程由于中性轴移动而引起的截面内力的不同计算公式 ,建立了一个由两个变量互相耦合而成的非线性方程组。通过一种理想的数值算法 ,完成了M -N -全过程非线性分析。所提出的非线性分析方法收敛速度很快 ,非常适合于编程计算 ,可以很方便地实现三个分析目标 :( 1)绘制M -N -曲线 ;( 2 )计算极限荷载 ;( 3 )计算任意荷载作用下截面混凝土。
Considering on nonlinear stress-strain relationships of concrete and steel bar (both prestressed and conventional), varied calculating formulae of internal force on I-shaped section of double-reinforcement prestressed concrete beam are derived according to different orientations of neutral axis in the whole loading progress.A group of nonlinear equations coupled with two variables are established.In addition,a practically numerical algorithm is utilized to solve the nonlinear equations.Therefore, the whole progress of M-N- nonlinear analysis is completed.Nonlinear equations converge rapidly by utilizing this nonlinear analytical method.It is very suitable for computer programming.Three objectives can be obtained conveniently as follows:(1)To plot M-N- curve;(2)To obtain ultimate loads;(3)To calculat stress of concrete,prestressed and conventional steel under arbitrary loads.
出处
《土木工程学报》
EI
CSCD
北大核心
2004年第7期47-50,共4页
China Civil Engineering Journal
关键词
双筋
工形截面
预应力混凝土
非线性分析
M-N-φ曲线
doubled-reinforcment
I-shapedscetion
prestressed concrete
nonlinear analysis
M-N- curve
