structural

[doctorbahman]

Hi friends
could you please help me by answering the following questions:
1)What does the ~ stands for when it comes before a node label?
2)Why "solve a equation block" happens?
I've brought my LOG file as you can see in the following:

SAP2000 v14.0.0 Advanced

L I N E A R E Q U A T I O N S O L U T I O N

FORMING STIFFNESS AT ZERO (UNSTRESSED) INITIAL CONDITIONS

TOTAL NUMBER OF EQUILIBRIUM EQUATIONS = 65388
APPROXIMATE "EFFECTIVE" BAND WIDTH = 882

NUMBER OF EQUATION STORAGE BLOCKS = 4
MAXIMUM BLOCK SIZE (8-BYTE TERMS) = 16696768
SIZE OF STIFFNESS FILE(S) (BYTES) = 509.879 MB

NUMBER OF EQUATIONS TO SOLVE = 65388

* * * W A R N I N G * * *
NUMERICAL PROBLEMS ENCOUNTERED DURING EQUATION ASSEMBLY:

TYPE LABEL DOF X-COORD Y-COORD Z-COORD PROBLEM VALUE
----- ------- -- ----------- ----------- ----------- ------------- -----------
Joint ~644 UZ 44.196521 30.589871 23.621076 Diag = 0 --> 1.00E-10
Joint ~644 RX 44.196521 30.589871 23.621076 Diag = 0 --> 1.00E-10
Joint ~644 RY 44.196521 30.589871 23.621076 Diag = 0 --> 1.00E-10
Joint ~640 UZ 42.283309 30.046561 19.350000 Diag = 0 --> 1.00E-10
Joint ~640 RX 42.283309 30.046561 19.350000 Diag = 0 --> 1.00E-10
Joint ~640 RY 42.283309 30.046561 19.350000 Diag = 0 --> 1.00E-10
Joint ~641 UZ 44.495740 29.770257 14.850000 Diag = 0 --> 1.00E-10
Joint ~641 RX 44.495740 29.770257 14.850000 Diag = 0 --> 1.00E-10
Joint ~641 RY 44.495740 29.770257 14.850000 Diag = 0 --> 1.00E-10
Joint ~642 UZ 45.426600 29.519323 10.350000 Diag = 0 --> 1.00E-10
Joint ~642 RX 45.426600 29.519323 10.350000 Diag = 0 --> 1.00E-10
Joint ~642 RY 45.426600 29.519323 10.350000 Diag = 0 --> 1.00E-10

Solving 4 equation blocks

Block 1 by block 1

* * * W A R N I N G * * *
NUMERICAL PROBLEMS ENCOUNTERED DURING EQUATION SOLUTION:

TYPE LABEL DOF X-COORD Y-COORD Z-COORD PROBLEM VALUE
----- ------- -- ----------- ----------- ----------- ------------- -----------
Joint 20575 RY 74.912173 42.000000 22.850000 Lost accuracy 6.3 digits
Block 2 by block 1
Block 2 by block 2
Block 3 by block 2
Block 3 by block 3
Block 4 by block 1
Block 4 by block 2
Block 4 by block 3
Block 4 by block 4

NUMBER OF EIGENVALUES BELOW SHIFT = 0


A N A L Y S I S C O M P L E T E

 

[stressed]

The ~ symbol indicates and internally created joint, likely due to automeshing option. I'm sorry but I don't know much about SAP2000 solution blocks. After the model solves with warnings like that, it's often helpful animate the deflections for selfweight, modal and other cases in order to visualize if there is a connectivity problem