土建專業(yè)外文翻譯---預(yù)應(yīng)力混凝土結(jié)構(gòu)的抗震加固方案與局部影響(存儲版)
【正文】 vulnerability. The term ‘repair’ is defined as reinstatement of the original characteristics of a damaged section or element and is confined to dealing with the asbuilt system. The term ‘strengthening’ is defined as intervention that lead to enhancement of one or more seismic response parameters (stiffness, strength, ductility, etc.), depending on the desired performance. Framework of seismic rehabilitation Performance objectives are set depending on the structural type, the importance of the building, its role in postearthquake emergencies, the economic consequences of business interruption, its historical or cultural significance, the construction material and socioeconomic factors. They can be specified as limits on one or more response parameter such as stresses, strains, displacements, accelerations, etc. Clearly, different limit states have to be correlated to the level of the seismic action, . to the earthquake demand level. The selection of the rehabilitation scheme and the level of intervention is a rather plex procedure, because many factors of different nature e into play. A decision has to be taken on the level of intervention. Some mon strategies are the restriction or change of use of the building, partial demolition and/or mass addition, methods such as base isolation, provision of supplemental damping and incorporation of passive and active vibration control devices may apply. The alternatives of ‘no intervention’ or ‘demolition’ are more likely the outes of the evaluation if the seismic retrofit of buildings is quite expensive and disruptive. Socioeconomic issues have to be considered in the decision of the level and type of intervention. Surprisingly, there are documented cases where aesthetic and psychological issu
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