Output File for Response Spectra Analysis of 4 Story Shear Building


*** ACCELERATION SPECTRA FOR MODAL ANALYSIS 
*** ======================================= 

MATRIX : "spectra"

row/col                  1            2   
        units          sec      m/sec^2   
   1            0.00000e+00  1.47150e+00
   2            1.00000e-01  1.76580e+00
   3            2.00000e-01  2.45250e+00
   4            3.00000e-01  3.72780e+00
   5            4.00000e-01  4.90500e+00
   6            5.00000e-01  4.90500e+00
   7            6.00000e-01  3.92400e+00
   8            8.00000e-01  3.13920e+00
   9            1.00000e+00  2.45250e+00
  10            1.20000e+00  1.86390e+00
  11            1.40000e+00  1.37340e+00
  12            1.60000e+00  9.81000e-01
  13            1.80000e+00  6.86700e-01
  14            2.00000e+00  4.90500e-01
  15            2.40000e+00  3.92400e-01
  16            2.80000e+00  2.94300e-01
  17            3.20000e+00  1.96200e-01
  18            3.40000e+00  1.96200e-01

MATRIX : "mass"

row/col                  1            2            3            4   
        units           kg           kg           kg           kg   
   1            1.50000e+03  0.00000e+00  0.00000e+00  0.00000e+00
   2            0.00000e+00  3.00000e+03  0.00000e+00  0.00000e+00
   3            0.00000e+00  0.00000e+00  3.00000e+03  0.00000e+00
   4            0.00000e+00  0.00000e+00  0.00000e+00  4.50000e+03

MATRIX : "stiff"

row/col                  1            2            3            4   
        units          N/m          N/m          N/m          N/m   
   1            8.00000e+05 -8.00000e+05  0.00000e+00  0.00000e+00
   2           -8.00000e+05  2.40000e+06 -1.60000e+06  0.00000e+00
   3            0.00000e+00 -1.60000e+06  4.00000e+06 -2.40000e+06
   4            0.00000e+00  0.00000e+00 -2.40000e+06  5.60000e+06

*** SUBSPACE ITERATION CONVERGED IN 10 ITERATIONS 

Mode         1  : w^2 =      117.8 1/sec^2  T =     0.5789 sec 
Mode         2  : w^2 =      586.5 1/sec^2  T =     0.2595 sec 
Mode         3  : w^2 =       1125 1/sec^2  T =     0.1873 sec 

MATRIX : "period"

row/col                  1   
        units                
   1      sec   5.78876e-01
   2      sec   2.59453e-01
   3      sec   1.87330e-01

MATRIX : "eigenvector"

row/col                  1            2            3   
        units                                          
   1            1.00000e+00  1.00000e+00 -9.00864e-01
   2            7.79103e-01 -9.96239e-02  1.00000e+00
   3            4.96553e-01 -5.39890e-01 -1.60784e-01
   4            2.35062e-01 -4.37612e-01 -7.05724e-01

MATRIX : "SpectralAccn"

row/col                  1   
        units                
   1  m/sec^2   4.13122e+00
   2  m/sec^2   3.21070e+00
   3  m/sec^2   2.36550e+00

MATRIX : "gmass"

row/col                  1            2            3   
        units           kg           kg           kg   
   1            4.30934e+03  2.84217e-13 -1.13687e-13
   2            1.13687e-13  3.26599e+03 -4.54747e-13
   3           -2.27374e-13 -2.27374e-13  6.53610e+03

MATRIX : "gstiff"

row/col                  1            2            3   
        units          N/m          N/m          N/m   
   1            5.07691e+05 -2.18279e-11  1.16415e-10
   2           -1.16415e-10  1.91539e+06 -1.16415e-10
   3            2.32831e-10 -2.32831e-10  7.35295e+06

MATRIX : "gload"

row/col                  1   
        units                
   1       kg   6.38475e+03
   2       kg  -2.38779e+03
   3       kg  -2.00941e+03

MATRIX : "Y"

row/col                  1            2            3   
        units            m            m            m   
   1            5.19545e-02  0.00000e+00  0.00000e+00
   2            0.00000e+00 -4.00257e-03  0.00000e+00
   3            0.00000e+00  0.00000e+00 -6.46441e-04

MATRIX : "modaldispl"

row/col                  1            2            3   
        units           cm           cm           cm   
   1            5.19545e+00 -4.00257e-01  5.82355e-02
   2            4.04779e+00  3.98752e-02 -6.46441e-02
   3            2.57982e+00  2.16095e-01  1.03938e-02
   4            1.22125e+00  1.75157e-01  4.56209e-02

Maximum Likely Floor Displacements (using SRSS)     
===============================================   

     Floor          Mode         Modes         Modes
        No             1         1 & 2    1, 2 and 3
         4      5.195 cm      5.211 cm      5.211 cm 
         3      4.048 cm      4.048 cm      4.049 cm 
         2       2.58 cm      2.589 cm      2.589 cm 
         1      1.221 cm      1.234 cm      1.235 cm 

Maximum Possible Floor Displacements (absolute values) 
====================================================== 

     Floor          Mode         Modes         Modes
        No             1         1 & 2    1, 2 and 3
         4      5.195 cm      5.596 cm      5.654 cm 
         3      4.048 cm      4.088 cm      4.152 cm 
         2       2.58 cm      2.796 cm      2.806 cm 
         1      1.221 cm      1.396 cm      1.442 cm 

Maximum Likely Story Drifts (using SRSS) 
======================================== 

     Story          Mode         Modes         Modes
        No             1         1 & 2    1, 2 and 3
         4      1.148 cm      1.229 cm      1.235 cm 
         3      1.468 cm      1.479 cm       1.48 cm 
         2      1.359 cm      1.359 cm       1.36 cm 
         1      1.221 cm      1.234 cm      1.235 cm 

Maximum Possible Story Drifts (absolute values) 
=============================================== 

     Story          Mode         Modes         Modes
        No             1         1 & 2    1, 2 and 3
         4      1.148 cm      1.588 cm      1.711 cm 
         3      1.468 cm      1.644 cm      1.719 cm 
         2      1.359 cm        1.4 cm      1.435 cm 
         1      1.221 cm      1.396 cm      1.442 cm 

Inertia Forces for each mode 
============================ 


MATRIX : "inertia_forces"

row/col                  1            2            3   
        units            N            N            N   
   1            9.18127e+03 -3.52106e+03  9.83037e+02
   2            1.43063e+04  7.01546e+02 -2.18364e+03
   3            9.11798e+03  3.80201e+03  3.55155e+02
   4            6.47450e+03  4.62254e+03  2.30532e+03

Shear Forces (at base of the structure) 
======================================= 


MATRIX : "base_shear_forces"

row/col                  1            2            3   
        units            N            N            N   
   1            3.90800e+04  5.60504e+03  1.45987e+03

Base Shear Force : Maximum Likely   =  3.951e+04 N 
                 : Maximum Possible =  4.614e+04 N 

Overturning Moments (at base of the structure) 
============================================== 


MATRIX : "base_overturning_moments"

row/col                  1            2            3   
        units          N.m          N.m          N.m   
   1            3.13063e+05  7.40882e+02  1.19055e+03

Overturning Moments : Maximum Likely   =  3.131e+05 N.m 
                    : Maximum Possible =   3.15e+05 N.m 


Developed in June 1996 by Mark Austin
Last Modified June 27, 1996
Copyright © 1996, Mark Austin, Department of Civil Engineering, University of Maryland