Ultimate Seismic Limit State and Repairability of Multi-Story Steel Frames Subjected To Severe Earthquake Loads

Abstract eng:
In the general seismic design, the building structures are required to have adequate strength to resist the applied loads. However, it has been reported that severe disasters, such as great earthquake, cause serious damage to a lot of building structures around the world. Based on these experiences, there are many discussions about resilience, repairability or recovery for damaged building structures. It can be said that the criteria of the repairability for damaged building structures are estimated by the residual seismic resistant performance against an aftershock or future earthquake, the existence of reconstruction technique and its possibility under the damaged structures, economic loss or reasonable construction cost, and necessity and urgency of repair. Furthermore, in order to evaluate the structural performance on repaired building structures, the recovery on repaired members becomes essential index, while it is also important consideration that repairing damaged members may influence the performance of the whole of the building structure after repair. In the case of steel structures, several studies have proposed repair methods for damaged steel members, and these studies have investigated the recovery of the structural performance on the repaired members. Based on these studies, a technical guideline and design procedure for repairing damaged building structures has been published in Japan. However, little study has been reported on investigating accurately the relationship between repair methods and the recovery of the structural performance on the repaired structures. This study aims to clarify the repairability and recovery on steel framed structure. Therefore, the relationship between repair method and the seismic resistant performance on repaired steel framed structure is studied analytically, and it is try to evaluate the repairability and the recovery on steel framed structures. In this paper, analytical study is conducted to investigate the repairability of multi-story steel frames by limit analysis and seismic response analysis, and the optimum repair strategy against future earthquakes is discussed. First, the multi-story steel frame is designed according to Japanese Seismic Design Standard as analytical model. Second, the ultimate seismic limit state and structural damage which may occur under great earthquakes are calculated. Third, based on past research of repair methods, several repairing strategy are planned and the recovery of the structural performance of each strategy are calculated. Finally, the optimum repairing strategy is explored by comparing each strategy. From the analytical results, it is observed that the structural performance of repaired steel framed model are enhanced if the adequate repairing strategy is adopted.

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