Abstract
The stress of the main tower of a cable‐stayed bridge depends on the connection type between the tower and deck. In order to study the most suitable longitudinal damping mode for a long‐span cable‐stayed bridge. In this article, a nonlinear finite element model is established based on a large span concrete cable‐stayed bridge with a main span of 680 m. Without considering the influence of the transverse constraint, the damping effect of the elastic connection device and the viscous damper is simulated when the longitudinal seismic load is input. The results show that the stiffness of the main beam is increased by installing the elastic connection device, so the longitudinal drift frequency of the main beam is increased, but the stiffness of the structure is not changed by installing the viscous damper. Both viscous dampers and elastic connection structures can reduce the longitudinal displacement of the beam end, but viscous dampers are more favorable for the stress of the main tower. In terms of damping effect, viscous dampers are more suitable for long‐span cable‐stayed bridges, but, in terms of economy and parameter control, elastic connection devices have more advantages.
Highlights
With the maturity of bridge construction technologies in the past decades, cable-stayed bridges with different main girder types, such as concrete girder and steel girder, have been widely adopted around the world, with a main span possibly reaching over 1000 meters
Among the typical passive control systems, the viscous damper (VD) [3] and elastic connecting devices (ECDs) [4] can effectively reduce both the vibration response and the structural displacement of long-span bridges under seismic actions. ey may reduce the internal force at the key sections of bridges, which make them feasible to apply in long-span bridges
A nonlinear three-dimensional finite element model is established for the whole bridge in SAP2000, as shown in Figure 8. e main tower, piers, and pile foundation of the bridge are all RC structures with Poisson’s ratio of 0.2 and a mass density of 2549 kg/m3
Summary
With the maturity of bridge construction technologies in the past decades, cable-stayed bridges with different main girder types, such as concrete girder and steel girder, have been widely adopted around the world, with a main span possibly reaching over 1000 meters. Among the typical passive control systems, the viscous damper (VD) [3] and elastic connecting devices (ECDs) [4] can effectively reduce both the vibration response and the structural displacement of long-span bridges under seismic actions. E result showed that, compared with the case with no mitigation device installed, the ECD can effectively reduce the longitudinal displacement at the girder end but may increase the base shear force and moment at the tower. The seismic response of near-fault long-span cable-stayed bridges more serious as the ratio of PGV to PGA increasing, so the ECDs are not suitable for controlling the displacement of the girder-tower. E above review shows that the ECDs can effectively reduce the displacement response at the girder end of a cable-stayed bridge under earthquakes but may disadvantageously increase the internal force response of the main tower. When the stiffness of the ECDs is suitable, the strength and deformation ability of the bridge and girder can be taken
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