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TECHNICAL PAPER

table 1: Models and outrigger position Table 2: Models based on relative flexural rigidity
moDeL oUtRiggeR Position (fLooR no) moDeLs eio/eis (β) DAmPing

M1 40 th 1 0.25
M2 20 & 10 th 2 0.5 For each β value, damping is
th
3 0.75
15 percent of the critical and
4 1 without dampers
5 1.25
6 1.5
7 1.75
8 2

table 3: variation in Response for M 1 under LA03
earthquake
ResPonse ot WithoUt With ReDUction
LocAtion DAmPeRs DAmPeRs (%)
(stoRy)
Lateral 40 0.232 0.111 52.11
Deflection
(m)
Bending 40 110.63 64.50 41.70
Moment
(MN-m)
Shear Force 40 7.56 4.71 37.70
in (MN)
Inter-story 40 3.89 1.34 65.55
Drift (e-3)
Base Shear 40 5.28 4.36 17.42
in (MN)

5.2 Results for structure M 1 under LA06
earthquake
(a) (b)
The variations obtained for lateral displacement, bending
Figure 2: (a) Elevation of model M1,(b) Elevation of model M2.
moment, shear force, inter story drift and base shear is recorded
in Table-4.
5. ResULts AND DIsCUssION

5.1 Results for structure M 1 under LA03 Observations:
earthquake From Table-4 it is observed that there is 33.65% of reduction
The variations obtained for lateral displacement, bending in lateral deflection,73.05% of reduction in story drift,52.80%
moment, shear force, inter story drift and base shear is recorded reduction in bending moment, 40.54% reduction in shear force
in Table-3. and 36.59% reduction in base shear in the Damped outrigger
structural system.
Observations:
5.3 Results for structure M 1 under LA14
From Table-3 it is observed that there is 52.11% of reduction
in lateral deflection, 65.55% of reduction in story drift, 41.7% earthquake
reduction in bending moment, 37.70% reduction in shear force The variations obtained for lateral displacement, bending
and 17.42% reduction in base shear in the Damped outrigger moment, shear force, inter story drift and base shear is recorded
structural system. in Table-5.

18 The IndIan ConCreTe Journal | november 2019