![]() Finally, the relationship between the two rigidities was found out, which helps to find a way to decrease the bending stiffness of spring while keeping its compressive stiffness strong enough. Then, some simulations aiming at verifying the correctness of the deduced bending stiffness expression were carried out. After a brief introduction to the construction mechanism and some assumptions, the mathematical representation of the spring bending stiffness was deduced based on the Kirchhoff theory which describes the spatial curve with displacement rather than time. This paper tries to make a balance between the compressive stiffness and the bending stiffness of the spring. ![]() However, its stiffness cannot be set to be too hard or too soft. Le présent article résume la secousse sismique enregistrée et les dommages observés aux immeubles en béton dans le CBD il porte une attention spéciale à l’identification des recherches futures et aux changements possibles aux pratiques de conception et aux codes sismiques canadiens afin de traiter les observations de Christchurch.Spring linkage can be applied to in-pipe robots for connecting different modules together and can make it pass through elbows more easily. Plusieurs immeubles dans le CBD ont subi de graves dommages, certains devant être démolis, demandant un accès très contrôlé au CBD pendant les mois suivant le séisme. La liquéfaction était étendue dans le CBD et dans les banlieues à l’est, entraînant des mouvements des fondations des maisons et des immeubles à bureaux. Le séisme a causé l’effondrement de deux immeubles à bureaux en béton armé, d’un garage de stationnement et de nombreux immeubles en maçonnerie non armée, dont plusieurs bâtiments patrimoniaux, causant 185 décès. La réplique sismique est survenue dans une faille non répertoriée à moins de 10 km du centre-ville, engendrant de graves dommages, particulièrement au district des affaires (CBD). À 12 h 51 heure locale le 22 février 2011, la Ville de Christchurch, Nouvelle-Zélande, a subi une réplique sismique d’une magnitude de 6,2 du séisme du 4 septembre 2010 de Darfield. ![]() This paper summarizes the recorded earthquake shaking and observed damage to concrete buildings in CBD, with a specific focus on identifying future research and possible changes for seismic design practice and codes in Canada to address the Christchurch observations. Many buildings in the CBD experienced severe damage, some requiring demolition, necessitating careful controlled access to the CBD in the months following the earthquake. Liquefaction was wide spread in the CBD and the eastern suburbs, resulting in foundation movement for housing and office buildings alike. The earthquake resulted in the collapse of two reinforced concrete office buildings, one parking garage, and numerous unreinforced masonry buildings, including many heritage structures, leading to 185 deaths. The aftershock occurred on an unmapped fault less than 10 km from the city centre resulting in significant damage, particularly in the Central Business District (CBD). At 12:51 pm local time on 22 February 2011, a M 6.2 aftershock of the 4 September 2010, Darfield earthquake shook the city of Christchurch, New Zealand. ![]()
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