Application and Assessment of Equivalent Linear Analysis Method for Conceptual Seismic Retrofit Design of Háros M0 Highway Bridge

Simon, József and Vigh, László Gergely and Horváth, Adrián and Pusztai, Pál (2015) Application and Assessment of Equivalent Linear Analysis Method for Conceptual Seismic Retrofit Design of Háros M0 Highway Bridge. PERIODICA POLYTECHNICA-CIVIL ENGINEERING, 59 (2). pp. 109-122. ISSN 0553-6626

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Abstract

In this study, seismic performance of the existing M0 Háros Highway Bridge, Budapest, Hungary is evaluated, and possible retrofitting method using seismic isolation system is illustrated. The large-span bridge is designed with minimal consideration of seismic actions. Seismic analysis of the existing configuration indicates the vulnerability of the bridge: seismic resistance of certain piers, bearings and pile foundations is not adequate. Eight different demand mitigation methods are evaluated taking into consideration quasi-elastic configurations as well as non-linear systems adopted with non-linear anti-seismic devices (NLASD). To accelerate the preliminary design phase, an equivalent linear analysis (ELA) methodology using effective dynamic properties is worked out. Keeping in mind the limitations of the ELA method, non-linear time-history analysis (NLTHA) is also applied for the retrofitted configuration for validation purposes. Comparison of the two methods shows that the ELA method gives the designer adequate, still conservative results for optimal retrofit decisions.

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