摘要
通过对预应力混凝土超静定结构弯矩调幅所需满足的条件以及次弯矩在受力过程中的变化的分析和研究,得出如下结论:结构允许调幅值应由λ=min[λθ,cλr]确定;在使用荷载下不允许出现裂缝的构件,则不允许调幅.在弯矩调幅时,应考虑次弯矩的影响.应按如下公式考虑次弯矩对弯矩调幅的影响:M=(1-λ)Mload+Msec,式中的次弯矩Msec并非为结构在弹性分析所得到的次弯矩,而是结构产生相应塑性铰后在支座处残留的次弯矩.次弯矩的大小与调幅度有关.
In this paper, the conditions needed for moment redistribution in statically indeterminate strutures of CCD are analyzed. It is pointed out that the moment redistribution is based on the equation λ=min[λθ,θer] ;and if the crack is not permitted,the moment redistribution should not be considered. During the procedure of moment redistribution,the secondary moment should be taken into account. The influence of the secondary moment is considered by the equation M=（1-λ）Mload＋Msec where Msec is not the result by the analysis of elastic methed,it is the secondary moment that remains in the pedestal when the structure is in the ultimate limit state. The secondary moment is dependent on the extent of moment redistribution.
出处
《西安工业大学学报》
CAS
2006年第4期365-367,共3页
Journal of Xi’an Technological University
关键词
预应力混凝土
超静定结构
弯矩调幅
塑性铰
延性
次弯矩
PPC
statically indeterminate structures
moment redistribution
plastic hinge
secondary moment
