LINK180单元如何进行几何瞬变体系非线性分析？

根据王新敏老师的《ANSYS 结构分析单元与应用》中的EX.2.5算例，命令流如下：FINISH/CLEAR/PREP7L0=1000EM=1.9E5A0=10P=75000ISTR=1E-6ET,1,LINK8MP,EX,1,EMR,1,A0,ISTRK,1$K,2,L0$K,3,2*L0L,1,2$L,2,3LATT,1,1,1LESIZE,ALL,,,1LMESH,ALLDK,1,ALLDK,3,ALLFK,2,FY,-P/SOLUANTYPE,0NLGEOM,1NSUBST,50OUTRES,ALL,ALLSOLVEFINISH/POST26NSOL,2,NODE(L0,0,0),U,YPROD,3,2,,,,,,-1PROD,4,1,,,,,,PXVAR,3PLVAR,4我想利...