increase load

[moshtagh]

hi every body
i have question, please help me
when i increase loads on the structure, the internal force of the member of the structure are also increased and no member can not be broken. why this is happend!?
please help me
thanks alot

[LeisaCassada]

I think it's a bug

[vesna]

I do not understand your problem. Explain it in more detail please.

[moshtagh]

ok!
when i increase gravity loads on the structure, from 100 N to 10000N, the internal member force increase from 30 N to 56 N, and this procedure has continued. means that when i increase the load on the structure at 10000000000000000000 N , the members are still safe and support internal forces but forexample in the other software (SAP) , its ok and at the 10000 N , the members are failed.
i hope it explained simply
thank alot

[vesna]

Can you describe your model shortly (elements, materials,...)?

[moshtagh]

ok
in here:

# units N , m

model BasicBuilder -ndm 3 -ndf 3

# tag X Y Z

node 1 2 2 2.828
node 2 6 2 2.828
node 3 10 2 2.828
node 4 14 2 2.828
node 5 18 2 2.828
node 6 2 6 2.828
node 7 6 6 2.828
node 8 10 6 2.828
node 9 14 6 2.828
node 10 18 6 2.828
node 11 2 10 2.828
node 12 6 10 2.828
node 13 10 10 2.828
node 14 14 10 2.828
node 15 18 10 2.828
node 16 2 14 2.828
node 17 6 14 2.828
node 18 10 14 2.828
node 19 14 14 2.828
node 20 18 14 2.828
node 21 2 18 2.828
node 22 6 18 2.828
node 23 10 18 2.828
node 24 14 18 2.828
node 25 18 18 2.828
node 26 0 0 0
node 27 4 0 0
node 28 8 0 0
node 29 12 0 0
node 30 16 0 0
node 31 20 0 0
node 32 0 4 0
node 33 4 4 0
node 34 8 4 0
node 35 12 4 0
node 36 16 4 0
node 37 20 4 0
node 38 0 8 0
node 39 4 8 0
node 40 8 8 0
node 41 12 8 0
node 42 16 8 0
node 43 20 8 0
node 44 0 12 0
node 45 4 12 0
node 46 8 12 0
node 47 12 12 0
node 48 16 12 0
node 49 20 12 0
node 50 0 16 0
node 51 4 16 0
node 52 8 16 0
node 53 12 16 0
node 54 16 16 0
node 55 20 16 0
node 56 0 20 0
node 57 4 20 0
node 58 8 20 0
node 59 12 20 0
node 60 16 20 0
node 61 20 20 0

# node DX DY RZ Mx My Mz

fix 26 1 1 1 1 1 1
fix 31 1 1 1 1 1 1
fix 56 1 1 1 1 1 1
fix 61 1 1 1 1 1 1

# uniaxialMaterial Steel02 $matTag $Fy $E $b $R0 $cR1 $cR2 $a1 $a2 $a3 $a4

uniaxialMaterial Steel02 1 3.4e8 2.1e11 0.02 15 0.925 0.15

#element corotTruss $eleTag $iNode $jNode $A $matTag

element corotTruss 1 1 2 0.00214 1
element corotTruss 2 2 3 0.00264 1
element corotTruss 3 3 4 0.00264 1
element corotTruss 4 4 5 0.00214 1
element corotTruss 5 6 7 0.000862 1
element corotTruss 6 7 8 0.000862 1
element corotTruss 7 8 9 0.000862 1
element corotTruss 8 9 10 0.000862 1
element corotTruss 9 11 12 0.000862 1
element corotTruss 10 12 13 0.000862 1
element corotTruss 11 13 14 0.000862 1
element corotTruss 12 14 15 0.000862 1
element corotTruss 13 16 17 0.000862 1
element corotTruss 14 17 18 0.000862 1
element corotTruss 15 18 19 0.000862 1
element corotTruss 16 19 20 0.000862 1
element corotTruss 17 21 22 0.00214 1
element corotTruss 18 22 23 0.00264 1
element corotTruss 19 23 24 0.00264 1
element corotTruss 20 24 25 0.00214 1
element corotTruss 21 1 6 0.00214 1
element corotTruss 22 2 7 0.000862 1
element corotTruss 23 3 8 0.000862 1
element corotTruss 24 4 9 0.000862 1
element corotTruss 25 5 10 0.00214 1
element corotTruss 26 6 11 0.00264 1
element corotTruss 27 7 12 0.000862 1
element corotTruss 28 8 13 0.000862 1
element corotTruss 29 9 14 0.000862 1
element corotTruss 30 10 15 0.00264 1
element corotTruss 31 11 16 0.00264 1
element corotTruss 32 12 17 0.000862 1
element corotTruss 33 13 18 0.000862 1
element corotTruss 34 14 19 0.000862 1
element corotTruss 35 15 20 0.00264 1
element corotTruss 36 16 21 0.00214 1
element corotTruss 37 17 22 0.000862 1
element corotTruss 38 18 23 0.000862 1
element corotTruss 39 19 24 0.000862 1
element corotTruss 40 20 25 0.00214 1
element corotTruss 41 26 27 0.00112 1
element corotTruss 42 27 28 0.00112 1
element corotTruss 43 28 29 0.00112 1
element corotTruss 44 29 30 0.00112 1
element corotTruss 45 30 31 0.00112 1
element corotTruss 46 32 33 0.000862 1
element corotTruss 47 33 34 0.000862 1
element corotTruss 48 34 35 0.000862 1
element corotTruss 49 35 36 0.000862 1
element corotTruss 50 36 37 0.000862 1
element corotTruss 51 38 39 0.000862 1
element corotTruss 52 39 40 0.000862 1
element corotTruss 53 40 41 0.000862 1
element corotTruss 54 41 42 0.000862 1
element corotTruss 55 42 43 0.000862 1
element corotTruss 56 44 45 0.000862 1
element corotTruss 57 45 46 0.000862 1
element corotTruss 58 46 47 0.000862 1
element corotTruss 59 47 48 0.000862 1
element corotTruss 60 48 49 0.000862 1
element corotTruss 61 50 51 0.000862 1
element corotTruss 62 51 52 0.000862 1
element corotTruss 63 52 53 0.000862 1
element corotTruss 64 53 54 0.000862 1
element corotTruss 65 54 55 0.000862 1
element corotTruss 66 56 57 0.00112 1
element corotTruss 67 57 58 0.00112 1
element corotTruss 68 58 59 0.00112 1
element corotTruss 69 59 60 0.00112 1
element corotTruss 70 60 61 0.00112 1
element corotTruss 71 26 32 0.00112 1
element corotTruss 72 27 33 0.000862 1
element corotTruss 73 28 34 0.000862 1
element corotTruss 74 29 35 0.000862 1
element corotTruss 75 30 36 0.000862 1
element corotTruss 76 31 37 0.00112 1
element corotTruss 77 32 38 0.00112 1
element corotTruss 78 33 39 0.000862 1
element corotTruss 79 34 40 0.000862 1
element corotTruss 80 35 41 0.000862 1
element corotTruss 81 36 42 0.000862 1
element corotTruss 82 37 43 0.00112 1
element corotTruss 83 38 44 0.00112 1
element corotTruss 84 39 45 0.000862 1
element corotTruss 85 40 46 0.000862 1
element corotTruss 86 41 47 0.000862 1
element corotTruss 87 42 48 0.000862 1
element corotTruss 88 43 49 0.00112 1
element corotTruss 89 44 50 0.00112 1
element corotTruss 90 45 51 0.000862 1
element corotTruss 91 46 52 0.000862 1
element corotTruss 92 47 53 0.000862 1
element corotTruss 93 48 54 0.000862 1
element corotTruss 94 49 55 0.00112 1
element corotTruss 95 50 56 0.00112 1
element corotTruss 96 51 57 0.000862 1
element corotTruss 97 52 58 0.000862 1
element corotTruss 98 53 59 0.000862 1
element corotTruss 99 54 60 0.000862 1
element corotTruss 100 55 61 0.00112 1
element corotTruss 101 26 1 0.00264 1
element corotTruss 102 27 1 0.000862 1
element corotTruss 103 32 1 0.000862 1
element corotTruss 104 33 1 0.000862 1
element corotTruss 105 27 2 0.00112 1
element corotTruss 106 28 2 0.000862 1
element corotTruss 107 33 2 0.000862 1
element corotTruss 108 34 2 0.000862 1
element corotTruss 109 28 3 0.000862 1
element corotTruss 110 29 3 0.000862 1
element corotTruss 111 34 3 0.000862 1
element corotTruss 112 35 3 0.000862 1
element corotTruss 113 29 4 0.000862 1
element corotTruss 114 30 4 0.00112 1
element corotTruss 115 35 4 0.000862 1
element corotTruss 116 36 4 0.000862 1
element corotTruss 117 30 5 0.000862 1
element corotTruss 118 31 5 0.00264 1
element corotTruss 119 36 5 0.000862 1
element corotTruss 120 37 5 0.000862 1
element corotTruss 121 32 6 0.00112 1
element corotTruss 122 33 6 0.000862 1
element corotTruss 123 38 6 0.000862 1
element corotTruss 124 39 6 0.000862 1
element corotTruss 125 33 7 0.000862 1
element corotTruss 126 34 7 0.000862 1
element corotTruss 127 39 7 0.000862 1
element corotTruss 128 40 7 0.000862 1
element corotTruss 129 34 8 0.000862 1
element corotTruss 130 35 8 0.000862 1
element corotTruss 131 40 8 0.000862 1
element corotTruss 132 41 8 0.000862 1
element corotTruss 133 35 9 0.000862 1
element corotTruss 134 36 9 0.000862 1
element corotTruss 135 41 9 0.000862 1
element corotTruss 136 42 9 0.000862 1
element corotTruss 137 36 10 0.000862 1
element corotTruss 138 37 10 0.00112 1
element corotTruss 139 42 10 0.000862 1
element corotTruss 140 43 10 0.000862 1
element corotTruss 141 38 11 0.000862 1
element corotTruss 142 39 11 0.000862 1
element corotTruss 143 44 11 0.000862 1
element corotTruss 144 45 11 0.000862 1
element corotTruss 145 39 12 0.000862 1
element corotTruss 146 40 12 0.000862 1
element corotTruss 147 45 12 0.000862 1
element corotTruss 148 46 12 0.000862 1
element corotTruss 149 40 13 0.000862 1
element corotTruss 150 41 13 0.000862 1
element corotTruss 151 46 13 0.000862 1
element corotTruss 152 47 13 0.000862 1
element corotTruss 153 41 14 0.000862 1
element corotTruss 154 42 14 0.000862 1
element corotTruss 155 47 14 0.000862 1
element corotTruss 156 48 14 0.000862 1
element corotTruss 157 42 15 0.000862 1
element corotTruss 158 43 15 0.000862 1
element corotTruss 159 48 15 0.000862 1
element corotTruss 160 49 15 0.000862 1
element corotTruss 161 44 16 0.000862 1
element corotTruss 162 45 16 0.000862 1
element corotTruss 163 50 16 0.00112 1
element corotTruss 164 51 16 0.000862 1
element corotTruss 165 45 17 0.000862 1
element corotTruss 166 46 17 0.000862 1
element corotTruss 167 51 17 0.000862 1
element corotTruss 168 52 17 0.000862 1
element corotTruss 169 46 18 0.000862 1
element corotTruss 170 47 18 0.000862 1
element corotTruss 171 52 18 0.000862 1
element corotTruss 172 53 18 0.000862 1
element corotTruss 173 47 19 0.000862 1
element corotTruss 174 48 19 0.000862 1
element corotTruss 175 53 19 0.000862 1
element corotTruss 176 54 19 0.000862 1
element corotTruss 177 48 20 0.000862 1
element corotTruss 178 49 20 0.000862 1
element corotTruss 179 54 20 0.000862 1
element corotTruss 180 55 20 0.00112 1
element corotTruss 181 50 21 0.000862 1
element corotTruss 182 51 21 0.000862 1
element corotTruss 183 56 21 0.00264 1
element corotTruss 184 57 21 0.000862 1
element corotTruss 185 51 22 0.000862 1
element corotTruss 186 52 22 0.000862 1
element corotTruss 187 57 22 0.00112 1
element corotTruss 188 58 22 0.000862 1
element corotTruss 189 52 23 0.000862 1
element corotTruss 190 53 23 0.000862 1
element corotTruss 191 58 23 0.000862 1
element corotTruss 192 59 23 0.000862 1
element corotTruss 193 53 24 0.000862 1
element corotTruss 194 54 24 0.000862 1
element corotTruss 195 59 24 0.000862 1
element corotTruss 196 60 24 0.00112 1
element corotTruss 197 54 25 0.000862 1
element corotTruss 198 55 25 0.000862 1
element corotTruss 199 60 25 0.000862 1
element corotTruss 200 61 25 0.00264 1


set p 1
pattern Plain 1 "Linear" {
# node FX FY FZ
load 1 0 0 -36000 0 0 0
load 2 0 0 -36000 0 0 0
load 3 0 0 -36000 0 0 0
load 4 0 0 -36000 0 0 0
load 5 0 0 -36000 0 0 0
load 6 0 0 -36000 0 0 0
load 7 0 0 -36000 0 0 0
load 8 0 0 -36000 0 0 0
load 9 0 0 -36000 0 0 0
load 10 0 0 -36000 0 0 0
load 11 0 0 -36000 0 0 0
load 12 0 0 -36000 0 0 0
load 13 0 0 -36000 0 0 0
load 14 0 0 -36000 0 0 0
load 15 0 0 -36000 0 0 0
load 16 0 0 -36000 0 0 0
load 17 0 0 -36000 0 0 0
load 18 0 0 -36000 0 0 0
load 19 0 0 -36000 0 0 0
load 20 0 0 -36000 0 0 0
load 21 0 0 -36000 0 0 0
load 22 0 0 -36000 0 0 0
load 23 0 0 -36000 0 0 0
load 24 0 0 -36000 0 0 0
load 25 0 0 -36000 0 0 0

}



recorder Element -file force.txt -ele all axialForce

# FINITE ELEMENT ANALYSIS MODEL
integrator LoadControl 36

test NormDispIncr 1 2000 0
algorithm KrylovNewton
numberer RCM
constraints Plain
system ProfileSPD
analysis Static
analyze 1000


its all of may cod
please help me

[vesna]

The way you defined your elements they start to yield at force of ~700,000. That is why you can increase gravity load that much and still have your elements in the elastic range.

[moshtagh]

thanks vesna