科研之友
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摘要
In this study a seismic isolated bridge is re-designed according to the current Codes' provisions to comprise an integral bridge system. A new type of abutment, which has the ability to accommodate both serviceability and earthquake resistance requirements of the bridge, is exploited in this bridge system. The abutment's web consists of transversely directed reinforced concrete (R/C) walls which are rigidly connected to the deck while the deck slab is extended towards the approach embankment and is rigidly connected with two pairs of walls. The walls are constructed in a concrete box-shaped substructure, which replaces the conventional wing walls and retains the backfill material. The design of the restraining abutment provides a hierarchy of the resistances of its structural components aiming at the development of plastic hinges at the walls' top and bottom. The foundation of the abutment is designed to have adequate capacity to withstand the in-service and seismic loading of the abutment. The investigation showed that the seismic actions of the piers of the integral bridge are effectively reduced, as part of the induced seismic energy is transmitted and dissipated by the earthquake-resistant abutment. The reductions in the seismic actions lead to cost-effective and smaller cross-sections of the piers and their foundations which also serve aesthetics.
- 出版日期2011-11
