Model for the seismic analysis of arch dams including interaction effects
Domínguez Abascal, José; Maeso, O.
- Published
- 1992
- Language
- en
Abstract
A three-dimensional boundary element model for the seismic analysis of arch dams is presented. The soil and the dam are assumed to be viscoelastic domains the former being boundless. The water is assume to be compressible subject to small amplitude motions. The three domains are discretized into B ."E. in a single model which includes a rigurous representation of the dam-foundation rock interaction, the water-foundation rock interaction and the traveling wave effects. The response of an arch dam (The Morrow Point dam) to harmonic waves propagating vertically is studied. The important influence of the abovementioned interaction and traveling wave effects is clearly shown by computed results. These results are in contrast with sorne obtained by other authors using a F.E. model.
Full text
Model o he seismic analysis o a ch dams including in e ac ion e ec s
J. Dominguez
Unil'e sidad de Se illa. Spain
O.Maesa
Unii'e sidad de Las Palmas de G an Cana ias. Spain
ABSTRACT: A h ee-dimensional bounda y elemen model o he seismic analysis
o a ch dams is p esen ed. The soil and he dam a e assumed o be iscoelas ic
domains he o me being boundless. The wa e is assume o be comp essible
subjec o small ampli ude mo ions. The h ee domains a e disc e ized in o
B ."E. in a single model which includes a igu ous ep esen a ion o he
dam- ounda ion ock in e ac ion, he wa e - ounda ion ock in e ac ion and he
a eling wa e e ec s. The esponse o an a ch dam (The Mo ow Poin dam) o
ha monic wa es p opaga ing e ically is s udied. The impo an in luence o
he abo emen ioned in e ac ion and a eling wa e e ec s is clea ly shown by
compu ed esul s. These esul s a e in con as wi h so ne ob ained by o he
au ho s using a F.E. model.
1 INTRODUCTION
The analysis o he seismic esponse
o dam- ese oi sys ems is an
impo an p oblem wi hin he ield o
ea hquake enginee ing. The seismic
esponse can no be s udied
conside ing he s uc u e as an
isola ed body unde he in luence o a
uni o m base mo ion. The e a e
impo an e ec s due o he space
dis ibu ion o he exci a ion, he
dam-wa e , dam- ounda ion and
wa e - ounda ion in e ac ion, ha
make necessa y he use o models
including he h ee media and he
in e ac ion be ween hem. A g ea ·
e o has been dedica ed o his
subjec in he las �o decades. The
s udies o Hall and Chop a (1983) and
Fok and Chop a (1986) who analysed he
signi icance o a numbe .o ac o s
con ibu ing o he esponsee shold be
men ioned. Those s udies ha e been
done using he Fini e Elemen Me hod.
The model o Fok and Chop a (1986} led
o an ex ao dina y ad ance in he
ea hquake analysis o a ch dams.
Howe e i s ill con ains impo an
simpli ica ions which may gi e ise o
un ealis ic esul s. I 's main
simpli ying assump ions and
limi a ions a e:
4601
a) The model includes a massless
ounda ions which is only jus i ied
by he necessi y o ep esen ing a
boundless complian ounda ion using
a ini -e inodel. The soil-s uc u e
in e ac ion is no p ope ly
ep esen ed and he a eling wa e
e ec s can no be aken in o
accoun . Ve y ecen ly Zhang and
Chop a (1991) ha e s a ed o
analyse an al .e na i e o his model
o · he ounda ion using a
wo-dimensional bounda y �n eg al
o mula ion combined wi h a Fou ie
expansion.
bl A bo om abso ion coe icien
is u sed o ep esen he
wa e - ounda ion in e ac ion. I is
based on he one dimensional
. ep esen a ion o he wa e
é lec ion be ween he wa e and a
uni o m hal -space.
e) The model does no ake in o
accoun he jo in
wa e - ounda ion-dam in e ac ion.The
model o · he oúnda ion ock used
o he in e ac ion wi h he dam is
independen o ha used o he
wa e - ounda ion ock in e ac ion.
d) The assump ion o an uni o m
c oss · sec -ion ex ending om he
icini y o he dam o i� ini y may