Advanced Seismic Upgrading of Existing Bridges With New Adaptive Imso-System for Seismic Response Modification

Abstract eng:
The high seismic risk of transportation networks in South East Europe (SEE) is a serious threat to public safety, sustainable economic and social development and security in the region. This risk has not been quantified to this date and sound seismic risk mitigation concepts are not available. Most of the existing bridges are constructed as non-aseismic and are older than 40 years, so that they are highly vulnerable to seismic loads and require immediate, reliable and cost-effective seismic upgrading. Therefore, leaded by the third author, specific large-scale international NATO Science for Peace Project “Seismic Upgrading of Bridges in South-East Europe by Innovative Technologies (SFP: 983828)”, was directed to realization of fundamental research and development of an innovative technology for seismic isolation and seismic protection of bridges. Extensive experimental tests have been conducted at the Institute of Earthquake Engineering and Engineering Seismology (IZIIS) in Skopje, Macedonia. The extensive research activity of this innovative NATO SfP project has been focused on development, creation and experimental validation of new, highly efficient, seismic response modification system for bridges. The proposed adaptive IMSO-system was developed based on optimized integration of the innovative concepts of Multi-Level Multi-Directional Seismic Energy Dissipation and Globally Optimized Seismic Energy Balance (GOSEB-System). The newly created adaptive IMSO-system for seismic protection of bridges represents important technical innovation capable of integrating the advantages of seismic isolation, seismic energy dissipation and effective displacement control. With the achieved advanced seismic isolation and seismic protection performances, in compliance with the actual seismic input energy, complete seismic protection of bridge structures is provided, even under the strongest earthquakes. In this paper presented are the original results obtained from recently conducted extensive experimental and analytical research devoted to development and validation of the created new method for advanced seismic upgrading of new and existing bridges including application of advanced adaptive IMSO-system for structural seismic response modification. The existing prototype bridge considered herein for innovative upgrading represents typical classical system commonly used in south-east Europe during middle years of the 20th century, mostly designed without consideration of seismic loads. It was confirmed that, with installation of optimally designed new adaptive IMSO-system, the selected specific non-seismic existing structure can be efficiently upgraded and converted to seismically resistant structure for expected seismic effects in its location. The specific nonlinear behavior features of all integrated components in the original IMSO-system have been successfully considered in the formulated advanced phenomenological analytical model.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket