模拟CFRP包裹钢管混凝土轴压，一开始就5U后不收敛？ 100

包裹CFRP的钢管混凝土柱可以计算出结果，去掉CFRP后反而第一增量步就无法收敛，提示

 ***WARNING: THE PLASTICITY/CREEP/CONNECTOR FRICTION ALGORITHM DID NOT CONVERGE 

             AT 8 POINTS

  ***NOTE: MATERIAL CALCULATIONS FAILED TO CONVERGE OR WERE NOT ATTEMPTED AT ONE 

          OR MORE POINTS. CONVERGENCE IS JUDGED UNLIKELY.这可能是哪里的问题