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TECHNICAL PAPER

table 7: variation in Response of M 2 under LA06 Table-9: Variation in lateral deflection for M 1 under
earthquake LA03 earthquake
ResPonse ot WithoUt With ReDUction β LAteRAL DefLection (m)
LocAtion DAmPeRs DAmPeRs (%) WithoUt DAmPeR With ReDUction
(stoRy) DAmPeR (%)
Lateral 20 & 10 0.116 0.061 47.41 0.25 0.260 0.128 50.77
Deflection
(m) 0.50 0.236 0.130 44.92
0.75 0.236 0.129 45.34
Bending 20 & 10 105.1 39.91 62.02
Moment 1 0.233 0.117 49.79
MN-m 1.25 0.217 0.106 51.15
Shear Force 20 & 10 6.91 4.42 36.03 1.50 0.207 0.106 48.79
in MN 1.75 0.219 0.107 51.14
Inter-story 20 & 10 2.37 1 57.81 2 0.216 0.107 50.46
Drift (e-3)
Base Shear 20 & 10 8.26 4.03 51.23 Observations:
in MN From the above Table-9 it is observed that there is a reduction
of 51.15% of lateral deflection of the system with dampers when
table 8: variation in Response of M 2 under LA14
the flexural rigidity ratio is kept at 1.25. The lateral deflection
earthquake reduces from 0.217m to 0.106m, but further increasing in the
ResPonse ot WithoUt With ReDUction flexural strength of the outrigger will not contribute to decrease
LocAtion DAmPeRs DAmPeRs (%) in the lateral deflection of the structure.
(stoRy)
Lateral 20 & 10 0.163 0.0729 55.28 5.7.2 Bending moment
Deflection
(m) The Bending moment based on variation of flexural rigidity
under La03 earthquake is recorded in Table-10
Bending 20 & 10 99.55 76.28 23.38
Moment
MN-m table 10: variation in bending moment for M 1
under LA03 earthquake
Shear Force 20 & 10 9.25 4.59 50.39 β
in MN benDing moment (mn-m)
WithoUt DAmPeR With ReDUction
Inter-story 20 & 10 2.15 0.79 63.26 DAmPeR (%)
Drift (e-3)
0.25 371.76 166.48 55.22
Base Shear 20 & 10 9.3 5.77 37.96
in MN 0.50 186.89 77 58.80
From the results obtained it is observed that the two outrigger 0.75 155.60 65.74 57.75
system did perform better than the one outrigger system. But 1 111.49 60.12 46.07
the inclusion of dampers into the system resulted in reducing
the response of the structure by reducing lateral deflection, 1.25 90.01 65.05 27.73
bending moment in the core, shear force, inter-story drift and 1.50 80.55 65.21 19.04
base shear considerably.
1.75 73 62.31 14.64

5.7 Results on performance of the system 2 66.79 60.32 9.69
based on relative flexural rigidity
Observations:
5.7.1 Lateral deflection From Table-10 it is observed that there is a reduction of 58.80%
The Lateral deflection based on variation of flexural rigidity of moment for flexural rigidity ratio 0.50 and that the reduction
under La03 earthquake is recorded in Table-9 in moment is not that effective after the flexural rigidity ratio 1.

20 The IndIan ConCreTe Journal | november 2019