Seismic design of high-rise towers for cable-stayed bridges under strong earthquakes

2011, Volume 5, Issue 4

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Frontiers of Structural and Civil Engineering >> 2011, Volume 5, Issue 4 doi: 10.1007/s11709-011-0127-5

Seismic design of high-rise towers for cable-stayed bridges under strong earthquakes

State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China

Available online: 2011-12-05

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Abstract

This paper presents the first of a series of studies on the seismic design of high-rise towers for cable-stayed bridges under strong earthquakes. One practical cable-stayed bridge with a 730 m long main span and two high-rise towers over 200 m in height was selected for this study. The preliminary results show that compared with piers, the tower is more vulnerable to pulse-like earthquakes, and it may develop plasticity at certain locations. In addition, viscous dampers may not have the same effect during pulse-like earthquakes as they do under site-specific earthquakes. Hence, reoptimization of damper parameters or reconsideration of other energy dissipation devices will be needed if strong earthquakes are likely to occur.

Keywords

high-rise tower ; cable-stayed bridge ; strong earthquake ; seismic design

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