ansys进行瞬态分析时，为什么前两个子步计算的位移为正，而解析法计算的结果是负值
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在对匀速移动常量力作用下的梁进行瞬态动力分析时，为什么前两个子步计算得到的位移是正值，而解析法计算的结果是负值，虽然在第四步很快变为负值，但是如果根据位移计算力时就会导致产生向上的力，与实际不符。请问该如何解决。
TIME 11 UY
UY_11
0.10000E-04 -0.382061E-02
0.24000E-02 -0.382061E-02
0.48000E-02 -0.382058E-02
0.72000E-02 -0.382044E-02
0.96000E-02 -0.382042E-02
0.12000E-01 -0.382158E-02
ANSYS相应命令流如下：
finish$/solu
antype,4$sstif,on$outres,all,last
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!静力分析
timint,off
allsel$time,1e-5$acel,,9.806$nsubst,2$kbc,1$solve
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!动力分析
timint,on
nsubst,1$kbc,1$autots,on$alphad,0$betad,0
TIME 11 UY
UY_11
0.10000E-04 -0.382061E-02
0.24000E-02 -0.382061E-02
0.48000E-02 -0.382058E-02
0.72000E-02 -0.382044E-02
0.96000E-02 -0.382042E-02
0.12000E-01 -0.382158E-02
ANSYS相应命令流如下：
finish$/solu
antype,4$sstif,on$outres,all,last
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!静力分析
timint,off
allsel$time,1e-5$acel,,9.806$nsubst,2$kbc,1$solve
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!动力分析
timint,on
nsubst,1$kbc,1$autots,on$alphad,0$betad,0
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