Abstract
In order to improve the seismic performance of long-span double deck steel truss continuous girder bridge, taking Dao Qing Chau Bridge in Fuzhou as an engineering background, the isolation scheme of friction pendulum bearing (FPB) and friction pendulum bearing combined with viscous dampers is applied to study seismic performance. A three-dimensional dynamic model of the bridge is established using SAP2000. Taking three artificial seismic waves as seismic excitation, the seismic response of the seismic structure is calculated by nonlinear time history integration, and is then compared with the seismic response of the seismic reduction and isolation structure. The results show that the friction pendulum bearing (FPB) scheme and combined seismic dissipation and isolation (CSDI) scheme show a good seismic dissipation and isolation effect and ensure the safety of the bridge structure. However, for whole-bridge isolation, friction pendulum bearing (FPB) will produce certain residual deformations and additional stress of the bearing under the conditions of temperature and external load. For the purpose of protecting the bearing, it is recommended to use the combined seismic dissipation and isolation (CSDI) scheme.
Highlights
In the process of double-layer bridge design, the following problems need to kept in mind: (1) the vertical support columns of upper and lower deck should be able to cope with large deformation, which means to design using ductile components; (2) paying attention to the relative displacement of the upper and lower deck joints to avoid shear failure; and (3) the upper and lower deck beams and joints should be designed according to the capacity protection
In the design of structural seismic dissipation and isolation, we can design according to these two basic rules: (1) by prolonging the natural vibration period and (2) structural damping axial force of a bridge structure after using friction pendulum bearing (FPB) compared seismic structure [8]
Based onisolation the characteristics a double deck steel truss continuous girder bridge, to ensure that the structure is in a safe state under the action of an earthquake, this paper studies theFinite schemeElement of frictionModel pendulum bearing (FPB) and the scheme of a combined use
Summary
Earthquakes are a kind of natural disaster with sudden and strong damages. Under the actions of rare earthquakes, even a building’s structure can collapse, which threatens the safety of human beings [1–3]. Seismic control of engineering structure is to change and adjust the dynamic characterBased the characteristics of a double steel continuous girder istics of on the structure by installing some isolation deck devices (suchtruss as isolation bearings), some bridge energy mechanisms dampers), some (such asthis pap ensure thatdissipation the structure is in a(such safeasstate under theadditional action ofsubstructure an earthquake, tuned mass dampers [13–17]), or to exert external forces, so as to limit the dynamic response studies the scheme of friction pendulum bearing (FPB) and the scheme of a combined u of an engineering structure under the action of an earthquake within an allowable range, in of friction pendulum bearing and viscous dampers, which are a kind of combined seism order to ensure the safety, serviceability, and durability of the engineering structure [18–22]. Structural of friction pendulum bearing and viscous dampers, which are a kind of combined seismic
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