MIDAS计算不收敛报错原因和解决方法.doc

输出结果如下:>ENTRYLOAD_BLOCK>ENTRYASSM_STIFF_LOAD(FORMGLOBALEQUILIBRIUMEQUATIONSINBLOCKS)>Inclass[MultifrontalSolver]:PLETEMULTI-FRONTALSOLVER>IERROR=-1>不正常的执行中断!1)问题分析:出现如上提示时,最常见的原因是模型中出现了不确定的刚体位移。在分析中必须对模型中所有的节点都定义足够的约束条件,以保证它们在各个平移和转动自由度上都不会出现不确定的刚体位移。2)类试问题A-桁架单元不能受弯,而在模型中没有约束它的转动自由度,就出现了不确定位移值。B-施加接触单元后因为分割节点,导致分割产生的节点没有约束条件,也会出现不确定位移值。C-单元异常,例如单元过度变形D-应力应变关系中有负斜率2、程序计算不收敛可能的原因?输出结果如下:X-....:+01MY-....:+01MZ-....:+01MINCREMENTNO.:1ITERATIONNO.:1LOADFACTOR:+:-02INCREMENTNO.:1ITERATIONNO.:2LOADFACTOR:+:-02INCREMENTNO.:1ITERATIONNO.:3LOADFACTOR:+:-01INCREMENTNO.:1ITERATIONNO.:4LOADFACTOR:+:-01INCREMENTNO.:1ITERATIONNO.:5LOADFACTOR:+:-02INCREMENTNO.:1ITERATIONNO.:6LOADFACTOR:+:+02INCREMENTNO.:1ITERATIONNO.:7LOADFACTOR:+:+00INCREMENTNO.:1ITERATIONNO.:8LOADFACTOR:+:+00INCREMENTNO.:1ITERATIONNO.:9LOADFACTOR:+:-01INCREMENTNO.:1ITERATIONNO.:10LOADFACTOR:+:+00INCREMENTNO.:1ITERATIONNO.:11LOADFACTOR:+:-01INCREMENTNO.:1ITERATIONNO.:12LOADFACTOR:+:-01INCREMENTNO.:1ITERATIONNO.:13LOADFACTOR:+:-01INCREMENTNO.:1ITERATI