Akademik Veri Yönetim Sistemi
16th European Conf on Earthquake Engineering (16ECEE), Thessaloniki, Yunanistan, 18 Haziran 2018, ss.1-12, (Tam Metin Bildiri)
Cable-supported long-span bridges are the landmark civil infrastructures. This is particularly significant for
Istanbul due to the long-span bridges on the Bosphorus Straits. The high seismicity of Istanbul necessities to
execute comprehensive investigation on earthquake performance of the bridges. The present study aims at
identifying the effects of the change in hanger form from inclined to vertical on seismic performance of the
Bosphorus Bridge. For this purpose, elaborate finite element models (FEM) of the bridge with inclined and
vertical hangers are first established according to the original and hanger replacement project specifications. The
second task is to produce simulated site-specific earthquake records according to a possible scenario earthquake
(Mw=7.4), which is the seismic ground motion fitted to a scenario that is randomly determined for Istanbul.
Based on the comparative outcomes from the non-linear time-history earthquake analysis of the bridge, the
section forces of the tower base-section, the approach viaduct box-beams and columns, the main deck and the
portal beams are obtained to considerably increase in case of vertical hanger arrangement. However, the cable
element forces of the bridge with vertical hanger decrease compared to those of the bridge with inclined hanger.
Thus, vertical configuration of the hanger elements is concluded to be more suitable for suspension bridges than
inclined form in terms of the sectional force demands and to need for additional structural requirements.