8/9/2019 Improving seismic performance of buildings with irregular plans

1/19

Improving the seismperformance of existi

buildings with irregulplans against torsion du

earthquakesAaron Quidilla

Alberto Joseph Quintana

Ivy Sanchez

Jonathan Sanchez

Allen Teruel

8/9/2019 Improving seismic performance of buildings with irregular plans

2/19

8/9/2019 Improving seismic performance of buildings with irregular plans

3/19

Buildings arecomplex structures

Deformationcapacity of buildingsare aected

!hoto ta"en from #o"demir$ et al% &'()*+

8/9/2019 Improving seismic performance of buildings with irregular plans

4/19

,-ASTI. T/0SI/

0,S!/

8/9/2019 Improving seismic performance of buildings with irregular plans

5/19

Regular structural system vs. TorsIrregularity

!hoto ta"en from #o"d

8/9/2019 Improving seismic performance of buildings with irregular plans

6/19

Regular structural system vs. TorsIrregularity

!hoto ta"en from #o"demir$ et al% &'()*+

Inertial forceearth2ua"e acts.enter of 3ass &.Resisting forcethe .enter of 0igiEccentricity exithere are unsystructural elemenstorey%

8/9/2019 Improving seismic performance of buildings with irregular plans

7/19

Regular structural system vs. TorsIrregularity

!hoto ta"en from #o"demir$ et al% &'()*+

Inertial forceearth2ua"e acts.enter of 3ass &.Resisting forcethe .enter of 0igiEccentricity exithere are unsystructural elemenstorey%

8/9/2019 Improving seismic performance of buildings with irregular plans

8/19

How to reduce eccent

-ateral bracing elements shouldsymmetrically arranged

-ateral bracings should be place

su5ciently a4ay from the centemass

8/9/2019 Improving seismic performance of buildings with irregular plans

9/19

Sometimes the variations in the structural in each 6oor cannot be avoided%

In order to compensate for the possibtorsional7induced earth2ua"e responses$ 8ealand code had suggested some criteriato overestimate the actual earth2ua"e load%

Instead of increasing torsional strength$ t4ist is emphasized%

8/9/2019 Improving seismic performance of buildings with irregular plans

10/19

!ew "ealand #hilippine

39%: ;ermadecIslands&)

8/9/2019 Improving seismic performance of buildings with irregular plans

11/19

Restrictions on Twist&According to the 1e4 8ealand

8/9/2019 Improving seismic performance of buildings with irregular plans

12/19

.0IT,0IA )@ The distance at anbet4een the .enter of 3ass and the .0igidity should neither exceed (%* timmaximum plan dimension of the stru

that level$ measured perpendicularlyapplied lateral force%

8/9/2019 Improving seismic performance of buildings with irregular plans

13/19

.,1T,0 /

0I#IDIT

.,1T,3ASS

,A0TCQA;,

-/AD

erx

8/9/2019 Improving seismic performance of buildings with irregular plans

14/19

.0IT,0IA '@ The ratio of the hodisplacements at the ends of thtransverse to the direction of the applishould be in range of *F9 and 9criterion ma"es allo4ances for a

minimum value for the torsional stine

8/9/2019 Improving seismic performance of buildings with irregular plans

15/19

8/9/2019 Improving seismic performance of buildings with irregular plans

16/19

$iscous %ampers

luid viscous damping is a 4ay to adddissipation to the lateral system of a structure% A 6uid viscous damper di

energy by pushing 6uid through an producing a damping pressure 4hich cforce%

8/9/2019 Improving seismic performance of buildings with irregular plans

17/19

&luid $iscous %amper

8/9/2019 Improving seismic performance of buildings with irregular plans

18/19

8/9/2019 Improving seismic performance of buildings with irregular plans

19/19

'ene(ts

0educe the earth2ua"e excitation of a

structure and permit it to remain linea

elastic during a seismic event

Substantial Stress 0eduction

0elatively small and inconspicuous

lexible