Why I got negative eigen value?

[sxhmlq]

Dear all,

I am a newbie for opensees. I want to do a eigen analysis, but the problem is I got negative eigen value. Could you please help me?

This is my script:
#################################################
#
#
# Available unit systems:
# 1) SI (kN, kPa, m, ton/m3)
# 2) English (inch, kip, kip-ft)
#
#################################################

# Unit system in this file: SI

# define UNITS ---------------------------------------------
set g 9.81; # gravitational acceleration

model basic -ndm 3 -ndf 6
#36_pile_left
node 1 0.00 0.00 0.00
node 2 0.00 0.00 -173.00
node 87 0.00 0.00 -43.25
node 88 0.00 0.00 -86.50
node 89 0.00 0.00 -129.75
node 3 46.49 99.69 0.00
node 4 46.49 99.69 -173.00
node 90 46.49 99.69 -43.25
node 91 46.49 99.69 -86.50
node 92 46.49 99.69 -129.75
node 5 92.98 199.39 0.00
node 6 92.98 199.39 -173.00
node 93 92.98 199.39 -43.25
node 94 92.98 199.39 -86.50
node 95 92.98 199.39 -129.75
node 7 139.46 299.08 0.00
node 8 139.46 299.08 -173.00
node 96 139.46 299.08 -43.25
node 97 139.46 299.08 -86.50
node 98 139.46 299.08 -129.75
node 9 185.95 398.78 0.00
node 10 185.95 398.78 -173.00
node 99 185.95 398.78 -43.25
node 100 185.95 398.78 -86.50
node 101 185.95 398.78 -129.75
node 11 232.44 498.47 0.00
node 12 232.44 498.47 -173.00
node 102 232.44 498.47 -43.25
node 103 232.44 498.47 -86.50
node 104 232.44 498.47 -129.75
node 13 278.93 598.16 0.00
node 14 278.93 598.16 -173.00
node 105 278.93 598.16 -43.25
node 106 278.93 598.16 -86.50
node 107 278.93 598.16 -129.75
node 15 325.42 697.86 0.00
node 16 325.42 697.86 -173.00
node 108 325.42 697.86 -43.25
node 109 325.42 697.86 -86.50
node 110 325.42 697.86 -129.75
node 17 371.90 797.55 0.00
node 18 371.90 797.55 -173.00
node 111 371.90 797.55 -43.25
node 112 371.90 797.55 -86.50
node 113 371.90 797.55 -129.75
node 19 418.39 897.24 0.00
node 20 418.39 897.24 -173.00
node 114 418.39 897.24 -43.25
node 115 418.39 897.24 -86.50
node 116 418.39 897.24 -129.75
#36_pile_right
node 21 1440.00 0.00 0.00
node 22 1440.00 0.00 -173.00
node 117 1440.00 0.00 -43.25
node 118 1440.00 0.00 -86.50
node 119 1440.00 0.00 -129.75
node 23 1486.49 99.69 0.00
node 24 1486.49 99.69 -173.00
node 120 1486.49 99.69 -43.25
node 121 1486.49 99.69 -86.50
node 122 1486.49 99.69 -129.75
node 25 1532.98 199.39 0.00
node 26 1532.98 199.39 -173.00
node 123 1532.98 199.39 -43.25
node 124 1532.98 199.39 -86.50
node 125 1532.98 199.39 -129.75
node 27 1579.46 299.08 0.00
node 28 1579.46 299.08 -173.00
node 126 1579.46 299.08 -43.25
node 127 1579.46 299.08 -86.50
node 128 1579.46 299.08 -129.75
node 29 1625.95 398.78 0.00
node 30 1625.95 398.78 -173.00
node 129 1625.95 398.78 -43.25
node 130 1625.95 398.78 -86.50
node 131 1625.95 398.78 -129.75
node 31 1672.44 498.47 0.00
node 32 1672.44 498.47 -173.00
node 132 1672.44 498.47 -43.25
node 133 1672.44 498.47 -86.50
node 134 1672.44 498.47 -129.75
node 33 1718.93 598.16 0.00
node 34 1718.93 598.16 -173.00
node 135 1718.93 598.16 -43.25
node 136 1718.93 598.16 -86.50
node 137 1718.93 598.16 -129.75
node 35 1765.42 697.86 0.00
node 36 1765.42 697.86 -173.00
node 138 1765.42 697.86 -43.25
node 139 1765.42 697.86 -86.50
node 140 1765.42 697.86 -129.75
node 37 1811.90 797.55 0.00
node 38 1811.90 797.55 -173.00
node 141 1811.90 797.55 -43.25
node 142 1811.90 797.55 -86.50
node 143 1811.90 797.55 -129.75
node 39 1858.39 897.24 0.00
node 40 1858.39 897.24 -173.00
node 144 1858.39 897.24 -43.25
node 145 1858.39 897.24 -86.50
node 146 1858.39 897.24 -129.75
#24_pile_left
node 41 -1408.00 0.00 0.00
node 42 -1408.00 0.00 -173.00
node 147 -1408.00 0.00 -43.25
node 148 -1408.00 0.00 -86.50
node 149 -1408.00 0.00 -129.75
node 43 -1366.16 89.72 0.00
node 44 -1366.16 89.72 -173.00
node 150 -1366.16 89.72 -43.25
node 151 -1366.16 89.72 -86.50
node 152 -1366.16 89.72 -129.75
node 45 -1324.32 179.45 0.00
node 46 -1324.32 179.45 -173.00
node 153 -1324.32 179.45 -43.25
node 154 -1324.32 179.45 -86.50
node 155 -1324.32 179.45 -129.75
node 47 -1282.48 269.17 0.00
node 48 -1282.48 269.17 -173.00
node 156 -1282.48 269.17 -43.25
node 157 -1282.48 269.17 -86.50
node 158 -1282.48 269.17 -129.75
node 49 -1240.64 358.90 0.00
node 50 -1240.64 358.90 -173.00
node 159 -1240.64 358.90 -43.25
node 160 -1240.64 358.90 -86.50
node 161 -1240.64 358.90 -129.75
node 51 -1198.80 448.62 0.00
node 52 -1198.80 448.62 -173.00
node 162 -1198.80 448.62 -43.25
node 163 -1198.80 448.62 -86.50
node 164 -1198.80 448.62 -129.75
node 53 -1156.96 538.35 0.00
node 54 -1156.96 538.35 -173.00
node 165 -1156.96 538.35 -43.25
node 166 -1156.96 538.35 -86.50
node 167 -1156.96 538.35 -129.75
node 55 -1115.13 628.07 0.00
node 56 -1115.13 628.07 -173.00
node 168 -1115.13 628.07 -43.25
node 169 -1115.13 628.07 -86.50
node 170 -1115.13 628.07 -129.75
node 57 -1073.29 717.80 0.00
node 58 -1073.29 717.80 -173.00
node 171 -1073.29 717.80 -43.25
node 172 -1073.29 717.80 -86.50
node 173 -1073.29 717.80 -129.75
node 59 -1031.45 807.52 0.00
node 60 -1031.45 807.52 -173.00
node 174 -1031.45 807.52 -43.25
node 175 -1031.45 807.52 -86.50
node 176 -1031.45 807.52 -129.75
node 61 -989.61 897.24 0.00
node 62 -989.61 897.24 -173.00
node 177 -989.61 897.24 -43.25
node 178 -989.61 897.24 -86.50
node 179 -989.61 897.24 -129.75
#24_pile_right
node 63 2848.00 0.00 0.00
node 64 2848.00 0.00 -173.00
node 180 2848.00 0.00 -43.25
node 181 2848.00 0.00 -86.50
node 182 2848.00 0.00 -129.75
node 65 2889.84 89.72 0.00
node 66 2889.84 89.72 -173.00
node 183 2889.84 89.72 -43.25
node 184 2889.84 89.72 -86.50
node 185 2889.84 89.72 -129.75
node 67 2931.68 179.45 0.00
node 68 2931.68 179.45 -173.00
node 186 2931.68 179.45 -43.25
node 187 2931.68 179.45 -86.50
node 188 2931.68 179.45 -129.75
node 69 2973.52 269.17 0.00
node 70 2973.52 269.17 -173.00
node 189 2973.52 269.17 -43.25
node 190 2973.52 269.17 -86.50
node 191 2973.52 269.17 -129.75
node 71 3015.36 358.90 0.00
node 72 3015.36 358.90 -173.00
node 192 3015.36 358.90 -43.25
node 193 3015.36 358.90 -86.50
node 194 3015.36 358.90 -129.75
node 73 3057.20 448.62 0.00
node 74 3057.20 448.62 -173.00
node 195 3057.20 448.62 -43.25
node 196 3057.20 448.62 -86.50
node 197 3057.20 448.62 -129.75
node 75 3099.04 538.35 0.00
node 76 3099.04 538.35 -173.00
node 198 3099.04 538.35 -43.25
node 199 3099.04 538.35 -86.50
node 200 3099.04 538.35 -129.75
node 77 3140.87 628.07 0.00
node 78 3140.87 628.07 -173.00
node 201 3140.87 628.07 -43.25
node 202 3140.87 628.07 -86.50
node 203 3140.87 628.07 -129.75
node 79 3182.71 717.80 0.00
node 80 3182.71 717.80 -173.00
node 204 3182.71 717.80 -43.25
node 205 3182.71 717.80 -86.50
node 206 3182.71 717.80 -129.75
node 81 3224.55 807.52 0.00
node 82 3224.55 807.52 -173.00
node 207 3224.55 807.52 -43.25
node 208 3224.55 807.52 -86.50
node 209 3224.55 807.52 -129.75
node 83 3266.39 897.24 0.00
node 84 3266.39 897.24 -173.00
node 210 3266.39 897.24 -43.25
node 211 3266.39 897.24 -86.50
node 212 3266.39 897.24 -129.75
#girder_main
node 85 -1408.00 398.78 0.00
node 86 3266.39 398.78 0.00
node 213 -1222.05 398.78 0.00
node 214 3033.95 398.78 0.00

#mass
mass 1 30.1 30.1 30.1 0 0 0
mass 3 30.1 30.1 30.1 0 0 0
mass 5 30.1 30.1 30.1 0 0 0
mass 7 30.1 30.1 30.1 0 0 0
mass 9 54.2 54.2 54.2 0 0 0
mass 11 30.1 30.1 30.1 0 0 0
mass 13 30.1 30.1 30.1 0 0 0
mass 15 30.1 30.1 30.1 0 0 0
mass 17 30.1 30.1 30.1 0 0 0
mass 19 30.1 30.1 30.1 0 0 0
mass 21 30.1 30.1 30.1 0 0 0
mass 23 30.1 30.1 30.1 0 0 0
mass 25 30.1 30.1 30.1 0 0 0
mass 27 30.1 30.1 30.1 0 0 0
mass 29 54.2 54.2 54.2 0 0 0
mass 31 30.1 30.1 30.1 0 0 0
mass 33 30.1 30.1 30.1 0 0 0
mass 35 30.1 30.1 30.1 0 0 0
mass 37 30.1 30.1 30.1 0 0 0
mass 39 30.1 30.1 30.1 0 0 0
mass 41 18.2 18.2 18.2 0 0 0
mass 43 18.2 18.2 18.2 0 0 0
mass 45 18.2 18.2 18.2 0 0 0
mass 47 18.2 18.2 18.2 0 0 0
mass 49 18.2 18.2 18.2 0 0 0
mass 51 18.2 18.2 18.2 0 0 0
mass 53 18.2 18.2 18.2 0 0 0
mass 55 18.2 18.2 18.2 0 0 0
mass 57 18.2 18.2 18.2 0 0 0
mass 59 18.2 18.2 18.2 0 0 0
mass 61 18.2 18.2 18.2 0 0 0
mass 63 18.2 18.2 18.2 0 0 0
mass 65 18.2 18.2 18.2 0 0 0
mass 67 18.2 18.2 18.2 0 0 0
mass 69 18.2 18.2 18.2 0 0 0
mass 71 18.2 18.2 18.2 0 0 0
mass 73 18.2 18.2 18.2 0 0 0
mass 75 18.2 18.2 18.2 0 0 0
mass 77 18.2 18.2 18.2 0 0 0
mass 79 18.2 18.2 18.2 0 0 0
mass 81 18.2 18.2 18.2 0 0 0
mass 83 18.2 18.2 18.2 0 0 0
mass 85 24.1 24.1 24.1 0 0 0
mass 86 24.1 24.1 24.1 0 0 0
mass 213 24.1 24.1 24.1 0 0 0
mass 214 24.1 24.1 24.1 0 0 0


#36_pile_left
fix 2 1 1 1 1 1 1
fix 4 1 1 1 1 1 1
fix 6 1 1 1 1 1 1
fix 8 1 1 1 1 1 1
fix 10 1 1 1 1 1 1
fix 12 1 1 1 1 1 1
fix 14 1 1 1 1 1 1
fix 16 1 1 1 1 1 1
fix 18 1 1 1 1 1 1
fix 20 1 1 1 1 1 1
#36_pile_right
fix 22 1 1 1 1 1 1
fix 24 1 1 1 1 1 1
fix 26 1 1 1 1 1 1
fix 28 1 1 1 1 1 1
fix 30 1 1 1 1 1 1
fix 32 1 1 1 1 1 1
fix 34 1 1 1 1 1 1
fix 36 1 1 1 1 1 1
fix 38 1 1 1 1 1 1
fix 40 1 1 1 1 1 1
#24_pile_left
fix 42 1 1 1 1 1 1
fix 44 1 1 1 1 1 1
fix 46 1 1 1 1 1 1
fix 48 1 1 1 1 1 1
fix 50 1 1 1 1 1 1
fix 52 1 1 1 1 1 1
fix 54 1 1 1 1 1 1
fix 56 1 1 1 1 1 1
fix 58 1 1 1 1 1 1
fix 60 1 1 1 1 1 1
fix 62 1 1 1 1 1 1
#24_pile_right
fix 64 1 1 1 1 1 1
fix 66 1 1 1 1 1 1
fix 68 1 1 1 1 1 1
fix 70 1 1 1 1 1 1
fix 72 1 1 1 1 1 1
fix 74 1 1 1 1 1 1
fix 76 1 1 1 1 1 1
fix 78 1 1 1 1 1 1
fix 80 1 1 1 1 1 1
fix 82 1 1 1 1 1 1
fix 84 1 1 1 1 1 1
#girder_main
fix 85 1 1 1 1 1 1
fix 86 1 0 1 1 1 1

# Define materials for columns
uniaxialMaterial Concrete01 1001 -4.00 -0.002 0.0 -0.006
uniaxialMaterial Concrete01 1002 -5.00 -0.002 0.0 -0.006
uniaxialMaterial Steel01 1003 60 30000 0.02
uniaxialMaterial Steel01 1004 60 30000 0.02

# 36'pile
section Fiber 10 {
patch circ 1001 16 4 0. 0. 0 17.25 0 360
patch circ 1003 16 1 0. 0. 17.25 18 0 360
layer circ 1004 10 0.724 0. 0. 14.41 0 360
}
# 24"pile
section Fiber 20 {
patch circ 1001 16 4 0. 0. 0 11.5 0 360
patch circ 1003 16 1 0. 0. 11.5 12 0 360
layer circ 1004 7 0.60 0. 0. 8.78 0 360
}

# cap beam
#section Elastic 3 1.0e+20 2520 7.56e+5 3.70e+5 1.0e+20 8.56e+5
#section Elastic 4 1.0e+20 1680 5.04e+5 1.98e+5 1.0e+20 3.17e+5
#girder
#section Elastic 5 1.0e+20 1215 5.05e+5 6.42e+5 1.0e+20 2.33e+5

uniaxialMaterial Elastic 2099 1e10; # define elastic torsional stiffness
section Aggregator 1 2099 T -section 10; # combine section properties
section Aggregator 2 2099 T -section 20; # combine section properties

geomTransf Linear 1001 0 1 0; #pile
geomTransf Linear 1002 0 0 -1; #main girder
geomTransf Linear 1003 0 0 -1; #cap beam

set numIntgrPts 3
#36_pile_left leltag iN jN Nintpts Sec Trans
element nonlinearBeamColumn 1 1 87 $numIntgrPts 1 1001
element nonlinearBeamColumn 2 87 88 $numIntgrPts 1 1001
element nonlinearBeamColumn 3 88 89 $numIntgrPts 1 1001
element nonlinearBeamColumn 4 89 2 $numIntgrPts 1 1001
element nonlinearBeamColumn 5 3 90 $numIntgrPts 1 1001
element nonlinearBeamColumn 6 90 91 $numIntgrPts 1 1001
element nonlinearBeamColumn 7 91 92 $numIntgrPts 1 1001
element nonlinearBeamColumn 8 92 4 $numIntgrPts 1 1001
element nonlinearBeamColumn 9 5 93 $numIntgrPts 1 1001
element nonlinearBeamColumn 10 93 94 $numIntgrPts 1 1001
element nonlinearBeamColumn 11 94 95 $numIntgrPts 1 1001
element nonlinearBeamColumn 12 95 6 $numIntgrPts 1 1001
element nonlinearBeamColumn 13 7 96 $numIntgrPts 1 1001
element nonlinearBeamColumn 14 96 97 $numIntgrPts 1 1001
element nonlinearBeamColumn 15 97 98 $numIntgrPts 1 1001
element nonlinearBeamColumn 16 98 8 $numIntgrPts 1 1001
element nonlinearBeamColumn 17 9 99 $numIntgrPts 1 1001
element nonlinearBeamColumn 18 99 100 $numIntgrPts 1 1001
element nonlinearBeamColumn 19 100 101 $numIntgrPts 1 1001
element nonlinearBeamColumn 20 101 10 $numIntgrPts 1 1001
element nonlinearBeamColumn 21 11 102 $numIntgrPts 1 1001
element nonlinearBeamColumn 22 102 103 $numIntgrPts 1 1001
element nonlinearBeamColumn 23 103 104 $numIntgrPts 1 1001
element nonlinearBeamColumn 24 104 12 $numIntgrPts 1 1001
element nonlinearBeamColumn 25 13 105 $numIntgrPts 1 1001
element nonlinearBeamColumn 26 105 106 $numIntgrPts 1 1001
element nonlinearBeamColumn 27 106 107 $numIntgrPts 1 1001
element nonlinearBeamColumn 28 107 14 $numIntgrPts 1 1001
element nonlinearBeamColumn 29 15 108 $numIntgrPts 1 1001
element nonlinearBeamColumn 30 108 109 $numIntgrPts 1 1001
element nonlinearBeamColumn 31 109 110 $numIntgrPts 1 1001
element nonlinearBeamColumn 32 110 16 $numIntgrPts 1 1001
element nonlinearBeamColumn 33 17 111 $numIntgrPts 1 1001
element nonlinearBeamColumn 34 111 112 $numIntgrPts 1 1001
element nonlinearBeamColumn 35 112 113 $numIntgrPts 1 1001
element nonlinearBeamColumn 36 113 18 $numIntgrPts 1 1001
element nonlinearBeamColumn 37 19 114 $numIntgrPts 1 1001
element nonlinearBeamColumn 38 114 115 $numIntgrPts 1 1001
element nonlinearBeamColumn 39 115 116 $numIntgrPts 1 1001
element nonlinearBeamColumn 40 116 20 $numIntgrPts 1 1001
#36_pile_right
element nonlinearBeamColumn 41 21 117 $numIntgrPts 1 1001
element nonlinearBeamColumn 42 117 118 $numIntgrPts 1 1001
element nonlinearBeamColumn 43 118 119 $numIntgrPts 1 1001
element nonlinearBeamColumn 44 119 22 $numIntgrPts 1 1001
element nonlinearBeamColumn 45 23 120 $numIntgrPts 1 1001
element nonlinearBeamColumn 46 120 121 $numIntgrPts 1 1001
element nonlinearBeamColumn 47 121 122 $numIntgrPts 1 1001
element nonlinearBeamColumn 48 122 24 $numIntgrPts 1 1001
element nonlinearBeamColumn 49 25 123 $numIntgrPts 1 1001
element nonlinearBeamColumn 50 123 124 $numIntgrPts 1 1001
element nonlinearBeamColumn 51 124 125 $numIntgrPts 1 1001
element nonlinearBeamColumn 52 125 26 $numIntgrPts 1 1001
element nonlinearBeamColumn 53 27 126 $numIntgrPts 1 1001
element nonlinearBeamColumn 54 126 127 $numIntgrPts 1 1001
element nonlinearBeamColumn 55 127 128 $numIntgrPts 1 1001
element nonlinearBeamColumn 56 128 28 $numIntgrPts 1 1001
element nonlinearBeamColumn 57 29 129 $numIntgrPts 1 1001
element nonlinearBeamColumn 58 129 130 $numIntgrPts 1 1001
element nonlinearBeamColumn 59 130 131 $numIntgrPts 1 1001
element nonlinearBeamColumn 60 131 30 $numIntgrPts 1 1001
element nonlinearBeamColumn 61 31 132 $numIntgrPts 1 1001
element nonlinearBeamColumn 62 132 133 $numIntgrPts 1 1001
element nonlinearBeamColumn 63 133 134 $numIntgrPts 1 1001
element nonlinearBeamColumn 64 134 32 $numIntgrPts 1 1001
element nonlinearBeamColumn 65 33 135 $numIntgrPts 1 1001
element nonlinearBeamColumn 66 135 136 $numIntgrPts 1 1001
element nonlinearBeamColumn 67 136 137 $numIntgrPts 1 1001
element nonlinearBeamColumn 68 137 34 $numIntgrPts 1 1001
element nonlinearBeamColumn 69 35 138 $numIntgrPts 1 1001
element nonlinearBeamColumn 70 138 139 $numIntgrPts 1 1001
element nonlinearBeamColumn 71 139 140 $numIntgrPts 1 1001
element nonlinearBeamColumn 72 140 36 $numIntgrPts 1 1001
element nonlinearBeamColumn 73 37 141 $numIntgrPts 1 1001
element nonlinearBeamColumn 74 141 142 $numIntgrPts 1 1001
element nonlinearBeamColumn 75 142 143 $numIntgrPts 1 1001
element nonlinearBeamColumn 76 143 38 $numIntgrPts 1 1001
element nonlinearBeamColumn 77 39 144 $numIntgrPts 1 1001
element nonlinearBeamColumn 78 144 145 $numIntgrPts 1 1001
element nonlinearBeamColumn 79 145 146 $numIntgrPts 1 1001
element nonlinearBeamColumn 80 146 40 $numIntgrPts 1 1001
#24_pile_left
element nonlinearBeamColumn 81 41 147 $numIntgrPts 2 1001
element nonlinearBeamColumn 82 147 148 $numIntgrPts 2 1001
element nonlinearBeamColumn 83 148 149 $numIntgrPts 2 1001
element nonlinearBeamColumn 84 149 42 $numIntgrPts 2 1001
element nonlinearBeamColumn 85 43 150 $numIntgrPts 2 1001
element nonlinearBeamColumn 86 150 151 $numIntgrPts 2 1001
element nonlinearBeamColumn 87 151 152 $numIntgrPts 2 1001
element nonlinearBeamColumn 88 152 44 $numIntgrPts 2 1001
element nonlinearBeamColumn 89 45 153 $numIntgrPts 2 1001
element nonlinearBeamColumn 90 153 154 $numIntgrPts 2 1001
element nonlinearBeamColumn 91 154 155 $numIntgrPts 2 1001
element nonlinearBeamColumn 92 155 46 $numIntgrPts 2 1001
element nonlinearBeamColumn 93 47 156 $numIntgrPts 2 1001
element nonlinearBeamColumn 94 156 157 $numIntgrPts 2 1001
element nonlinearBeamColumn 95 157 158 $numIntgrPts 2 1001
element nonlinearBeamColumn 96 158 48 $numIntgrPts 2 1001
element nonlinearBeamColumn 97 49 159 $numIntgrPts 2 1001
element nonlinearBeamColumn 98 159 160 $numIntgrPts 2 1001
element nonlinearBeamColumn 99 160 161 $numIntgrPts 2 1001
element nonlinearBeamColumn 100 161 50 $numIntgrPts 2 1001
element nonlinearBeamColumn 101 51 162 $numIntgrPts 2 1001
element nonlinearBeamColumn 102 162 163 $numIntgrPts 2 1001
element nonlinearBeamColumn 103 163 164 $numIntgrPts 2 1001
element nonlinearBeamColumn 104 164 52 $numIntgrPts 2 1001
element nonlinearBeamColumn 105 53 165 $numIntgrPts 2 1001
element nonlinearBeamColumn 106 165 166 $numIntgrPts 2 1001
element nonlinearBeamColumn 107 166 167 $numIntgrPts 2 1001
element nonlinearBeamColumn 108 167 54 $numIntgrPts 2 1001
element nonlinearBeamColumn 109 55 168 $numIntgrPts 2 1001
element nonlinearBeamColumn 110 168 169 $numIntgrPts 2 1001
element nonlinearBeamColumn 111 169 170 $numIntgrPts 2 1001
element nonlinearBeamColumn 112 170 56 $numIntgrPts 2 1001
element nonlinearBeamColumn 113 57 171 $numIntgrPts 2 1001
element nonlinearBeamColumn 114 171 172 $numIntgrPts 2 1001
element nonlinearBeamColumn 115 172 173 $numIntgrPts 2 1001
element nonlinearBeamColumn 116 173 58 $numIntgrPts 2 1001
element nonlinearBeamColumn 117 59 174 $numIntgrPts 2 1001
element nonlinearBeamColumn 118 174 175 $numIntgrPts 2 1001
element nonlinearBeamColumn 119 175 176 $numIntgrPts 2 1001
element nonlinearBeamColumn 120 176 60 $numIntgrPts 2 1001
element nonlinearBeamColumn 121 61 177 $numIntgrPts 2 1001
element nonlinearBeamColumn 122 177 178 $numIntgrPts 2 1001
element nonlinearBeamColumn 123 178 179 $numIntgrPts 2 1001
element nonlinearBeamColumn 124 179 62 $numIntgrPts 2 1001
#24_pile_right
element nonlinearBeamColumn 125 63 180 $numIntgrPts 2 1001
element nonlinearBeamColumn 126 180 181 $numIntgrPts 2 1001
element nonlinearBeamColumn 127 181 182 $numIntgrPts 2 1001
element nonlinearBeamColumn 128 182 64 $numIntgrPts 2 1001
element nonlinearBeamColumn 129 65 183 $numIntgrPts 2 1001
element nonlinearBeamColumn 130 183 184 $numIntgrPts 2 1001
element nonlinearBeamColumn 131 184 185 $numIntgrPts 2 1001
element nonlinearBeamColumn 132 185 66 $numIntgrPts 2 1001
element nonlinearBeamColumn 133 67 186 $numIntgrPts 2 1001
element nonlinearBeamColumn 134 186 187 $numIntgrPts 2 1001
element nonlinearBeamColumn 135 187 188 $numIntgrPts 2 1001
element nonlinearBeamColumn 136 188 68 $numIntgrPts 2 1001
element nonlinearBeamColumn 137 69 189 $numIntgrPts 2 1001
element nonlinearBeamColumn 138 189 190 $numIntgrPts 2 1001
element nonlinearBeamColumn 139 190 191 $numIntgrPts 2 1001
element nonlinearBeamColumn 140 191 70 $numIntgrPts 2 1001
element nonlinearBeamColumn 141 71 192 $numIntgrPts 2 1001
element nonlinearBeamColumn 142 192 193 $numIntgrPts 2 1001
element nonlinearBeamColumn 143 193 194 $numIntgrPts 2 1001
element nonlinearBeamColumn 144 194 72 $numIntgrPts 2 1001
element nonlinearBeamColumn 145 73 195 $numIntgrPts 2 1001
element nonlinearBeamColumn 146 195 196 $numIntgrPts 2 1001
element nonlinearBeamColumn 147 196 197 $numIntgrPts 2 1001
element nonlinearBeamColumn 148 197 74 $numIntgrPts 2 1001
element nonlinearBeamColumn 149 75 198 $numIntgrPts 2 1001
element nonlinearBeamColumn 150 198 199 $numIntgrPts 2 1001
element nonlinearBeamColumn 151 199 200 $numIntgrPts 2 1001
element nonlinearBeamColumn 152 200 76 $numIntgrPts 2 1001
element nonlinearBeamColumn 153 77 201 $numIntgrPts 2 1001
element nonlinearBeamColumn 154 201 202 $numIntgrPts 2 1001
element nonlinearBeamColumn 155 202 203 $numIntgrPts 2 1001
element nonlinearBeamColumn 156 203 78 $numIntgrPts 2 1001
element nonlinearBeamColumn 157 79 204 $numIntgrPts 2 1001
element nonlinearBeamColumn 158 204 205 $numIntgrPts 2 1001
element nonlinearBeamColumn 159 205 206 $numIntgrPts 2 1001
element nonlinearBeamColumn 160 206 80 $numIntgrPts 2 1001
element nonlinearBeamColumn 161 81 207 $numIntgrPts 2 1001
element nonlinearBeamColumn 162 207 208 $numIntgrPts 2 1001
element nonlinearBeamColumn 163 208 209 $numIntgrPts 2 1001
element nonlinearBeamColumn 164 209 82 $numIntgrPts 2 1001
element nonlinearBeamColumn 165 83 210 $numIntgrPts 2 1001
element nonlinearBeamColumn 166 210 211 $numIntgrPts 2 1001
element nonlinearBeamColumn 167 211 212 $numIntgrPts 2 1001
element nonlinearBeamColumn 168 212 84 $numIntgrPts 2 1001
#girder_main
element elasticBeamColumn 169 85 213 1215 1.00E+20 1.00E+20 1.00E+20 5.05E+05 6.42E+05 1002
element elasticBeamColumn 170 213 9 1215 1.00E+20 1.00E+20 1.00E+20 5.05E+05 6.42E+05 1002
element elasticBeamColumn 171 9 29 1215 1.00E+20 1.00E+20 1.00E+20 5.05E+05 6.42E+05 1002
element elasticBeamColumn 172 29 214 1215 1.00E+20 1.00E+20 1.00E+20 5.05E+05 6.42E+05 1002
element elasticBeamColumn 173 214 86 1215 1.00E+20 1.00E+20 1.00E+20 5.05E+05 6.42E+05 1002
#girder_36L
element elasticBeamColumn 174 1 3 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 175 3 5 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 176 5 7 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 177 7 9 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 178 9 11 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 179 11 13 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 180 13 15 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 181 15 17 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 182 17 19 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
#girder_36R
element elasticBeamColumn 183 21 23 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 184 23 25 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 185 25 27 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 186 27 29 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 187 29 31 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 188 31 33 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 189 33 35 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 190 35 37 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
element elasticBeamColumn 191 37 39 2520 1.00E+20 1.00E+20 1.00E+20 7.56E+05 8.56E+05 1003
#girder_24L
element elasticBeamColumn 192 41 43 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 193 43 45 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 194 45 47 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 195 47 49 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 196 49 51 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 197 51 53 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 198 53 55 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 199 55 57 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 200 57 59 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 201 59 61 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
#girder_24R
element elasticBeamColumn 202 63 65 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 203 65 67 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 204 67 69 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 205 69 71 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 206 71 73 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 207 73 75 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 208 75 77 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 209 77 79 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 210 79 81 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003
element elasticBeamColumn 211 81 83 1680 1.00E+20 1.00E+20 1.00E+20 5.04E+05 1.98E+05 1003

eigen 4

[silvia]

likely, ill-conditioned stiffness matrix. meaning your system is not properly constrained. also, you should not have too many nbc elements in a row. you should use the displacement-based element for that.

[sxhmlq]

Silvia, thanks for your response.

But I have changed the element to dispBeamColumn, it does not work.

And I need to fix the bottom of the structure, so could you please give me some advice for the constrains conditon?

Thank you

[silvia]

you need to provide enought constraints to remove any rigid-body deformations.

[seddighi]

I have a 3D model without any eccentry. but my eigen value is negetive, and i can`t define rayleigh damping matrix according to moods frequency.
i use dispBeamColumn, i don`t know what is wrong with my modeling. please kindly help me?

[vesna]

There is something wrong with your model. Check connectivity of your elements, boundary conditions for your system and make sure that you do not have hanging nodes.