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