我是一名新手，我在用adina做边坡在重力荷载下的分析中，老是出现问题，点坐标是1(0 0 0) 2(0 47 0) 3(0 47 15) 4(0 32 15) 5(0 12 5) 6(0 0 5) ，土的材料用摩尔库伦材料，c为10kp，摩擦角为25度，弹性模量为100000kpa，泊松比为0.3，长方形下边为固定，左右边为水平约束，重力的时间函数为1，采用三节点试过，四节点也试过，我用一个简单的长方形代替做过
，土的材料用摩尔库伦材料，c为10kp，摩擦角为25度，弹性模量为100000kpa，泊松比为0.3，长方形下边为固定，左右边为水平约束，重力的时间函数为1，采用三节点试过，四节点也试过，我用一个简单的长方形代替做过分析，还是不行，总是会出现Stiffness matrix not positive definite,boundary conditi***** or model collapsed，然后也会No element connection for node 50 directi***** 1, 4, 5, 6 Message limit reached - above message has been suppressed 811 times. Nodal degrees of freedom without element
connection have been fixed for data input file.
There may still be degrees of freedom without，请问高手若是自由度的问题，那我是哪个自由度有问题，在求解文件中有
CHECK THE FOLLOWING --
(A) BOUNDARY CONDITI***** - THE B.C. MUST NOT ADMIT A RIGID BODY DISPLACEMENT OR ROTATION OF THE TOTAL STRUCTURE. (B) DELETION OF DEGREES-OF-FREEDOM - ALL D.O.F. AT NODAL POINTS WITHOUT STIFFNESS CONTRIBUTI***** FROM ELEMENTS MUST HAVE BEEN DELETED. (C) ELEMENT GEOMETRY AND CONNECTIVITY - ALL ELEMENTS MUST HAVE BEEN INPUT WITH PROPER NODAL NUMBERS, AS DESCRIBED IN THE USERS MANUAL. (D) ELEMENT INTEGRATION ORDERS - THE ORDERS OF NUMERICAL INTEGRATI***** FOR EVALUATION OF ELEMENT MATRICES MUST BE SUFFICIENTLY HIGH. (E) MATERIAL DATA - ALL MATERIAL DATA MUST BE PHYSICALLY REASONABLE (E.G. YOUNG*S MODULUS MUST BE GREATER THAN ZERO).我是真的找不到办法了，又没有什么钱了，真心的希望哪个高手看在我也是诚心学习的份上，帮我解决一下，谢谢了……这个图的下边是错的，固定边界不一样，我不会删掉这个图片，呵呵[/pre]
[ 本帖最后由 xiwei21400 于 2011-3-20 19:47 编辑 ]
