Abstract

AbstractThis paper provides a very efficient, integrated framework for seismic analyses of long-span cable-stayed bridges. The efficiency comes from the dramatic reduction in formation time and the degrees of freedom (DOF) associated with the structure, using the integrated finite strip method (IFSM) along with the application of a very robust and efficient time history method (THM) using the Newmark scheme for dynamic analysis of the bridge structure. The previous versions of the finite strip method are limited to modeling the bridge deck only, whereas other structural components are replaced by assumed boundary conditions. Using the IFSM, all components of the long-span cable-stayed bridge can be modeled in a unified system, and consequently, the real dynamic behavior including the interactions between deck, piers, and cables can be perfectly considered. To verify the solution, the geometric and dynamic properties of the Kap Shui Mun (KSM) Bridge, as a real example of a long-span cable-stayed bridge, ar...

Highlights

  • To meet the economic, social, and recreational needs of the community for safe and efficient transportation systems, long-span bridges have been built throughout the world

  • The accuracy of the integrated finite strip solution in dynamic analysis of long-span cable-stayed bridges is evaluated by comparing the natural frequencies of the Kap Shui Mun (KSM) Bridge with those obtained by FEM and with the natural frequencies reported from the field-test measurements (Lau et al 1999)

  • The present research was performed in the environment of the integrated finite strip method (IFSM) for seismic analysis of long-span cable-stayed bridges

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Summary

Introduction

Social, and recreational needs of the community for safe and efficient transportation systems, long-span bridges have been built throughout the world. The finite strip method can be programmed such that only a limited amount of the input data is needed Considering that it was only a simple case study, there is no doubt that for long-span cable-stayed bridges, with an impressive number of DOF, the amount of computational timesaving is much more significant than that with finite element dynamic analysis. The accuracy of the integrated finite strip solution in dynamic analysis of long-span cable-stayed bridges is evaluated by comparing the natural frequencies of the Kap Shui Mun (KSM) Bridge with those obtained by FEM and with the natural frequencies reported from the field-test measurements (Lau et al 1999). The numerical results show that the convergence and accuracy of IFSM in dynamic analysis of long-span cable-stayed bridges is very high, which confirms the efficiency and capability of this numerical technique

Dynamic Properties Estimation Using IFSM
Displacement Functions
Modeling the Transition Section
Side spans
Time History Analysis
Ksb Kb dsðtÞ dbðtÞ
Newmark Scheme for Numeral Integration
Nature of mode shape
Numerical Studies
Finite Strip Modeling of the Bridge
Verification of the Integrated Approach
Seismic Analysis
Seismic Behavior under Uniform Excitation
Seismic Behavior under Nonuniform Excitation
Findings
Conclusions

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