Seismic performance evaluation of large-span offshore cable-stayed bridges under non-uniform earthquake excitations including strain rate effect


This paper presents a novel and precise seismic performance evaluation method for large-span offshore cable-stayed (LSOCS) bridge by considering the strain rate effect of RC materials and the spatial variation effect of seafloor seismic motions. Three-dimensional finite element (FE) model of a LSOCS bridge located in the southeast coast of China is constructed in the ABAQUS platform. The non-uniform ground motions at the offshore site beneath the bridge are stochastically simulated and used as seismic inputs. Moreover, a subroutine for considering the rate-dependent properties of RC materials in a fiber-based beam-column element model is developed to account for the strain rate effect of RC materials in the nonlinear time-history analysis. The numerical results indicate that seismic responses and fragilities of the LSOCS bridge are both considerably affected by the non-uniform seafloor seismic motions and strain rate effect. The seismic performance evaluation approach presented in this paper can provide vital support for earthquake resistant design of LSOCS bridges.

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Corresponding author

Correspondence to Jun-Sheng Su.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant No. 51808099) and the Fundamental Research Funds for the Central Universities (Grant No. DUT20RC(3)005).

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Li, C., Li, H., Zhang, H. et al. Seismic performance evaluation of large-span offshore cable-stayed bridges under non-uniform earthquake excitations including strain rate effect. Sci. China Technol. Sci. (2020).

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  • large-span offshore cable-stayed bridges
  • spatially varying seafloor seismic motions
  • strain rate effect
  • seismic fragility