000009472 001__ 9472
000009472 005__ 20141205150209.0
000009472 04107 $$aeng
000009472 046__ $$k2008-10-12
000009472 100__ $$aBahrami, Hamid
000009472 24500 $$aSeismic Response of Steel Bridges With Decoupled Ductile End-Cross Frames

000009472 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000009472 260__ $$b
000009472 506__ $$arestricted
000009472 520__ $$2eng$$aA promising technique for improving the seismic performance of highway bridges with steel plate girder superstructures, is to dissipate energy through the inelastic deformation of the end-cross frames. Ductile response of these cross frames can reduce the shear demand on the substructure below the frames, but this reduction in base shear is accompanied by an increase in the lateral drift in the superstructure, which in turn places large deformation and force demands on the shear connectors and plate girders. Damage to these components may lead to permanent deformations in the superstructure, which could lead to reduced capacity for live load. This paper presents the development of a cross frame that is partially decoupled from the superstructure, which then permits larger drifts to occur without causing damage to elements elsewhere in the superstructure while dissipating significant levels of energy. In the proposed configuration, the shear studs are removed from the top flange of the girders between the support and the first intermediate cross frame at both ends of the span. Ductile chevron (inverted V) bracing is then used at the supports to transmit the lateral shear from the concrete deck slab directly to the lower flange of the girders above the bearings. It is shown that these decoupled frames can tolerate drifts of up to 6% without causing distress to the remainder of the superstructure. At such a drift, the base shear transmitted to the substructure is about 25% of the value when the superstructure has conventional ductile end-cross frames.

000009472 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000009472 653__ $$aseismic performance, steel bridge superstructures, decoupled ductile end-cross frames

000009472 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000009472 720__ $$aBahrami, Hamid$$iBuckle,  Ian G.$$iItani, Ahmad
000009472 8560_ $$ffischerc@itam.cas.cz
000009472 8564_ $$s266932$$uhttps://invenio.itam.cas.cz/record/9472/files/05-02-0037.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 05-02-0037.
000009472 962__ $$r9324
000009472 980__ $$aPAPER