Prevention of earthquake and other natural disasters has become increasingly important in the last construction projects. This prevention reduces the seismic risk through retrofitting existing buildings which meet seismic safety requirements. Alterations to existing buildings also differs new planning through an important conditions; the existing construction must be taken as the basis for all planning and building actions.
The new structures are built as sufficiently earthquake resistant with a proper design methodology and construction quality control. The existing old structures planned without considering this important aspect, in the past, has enormous risk in particular to human life and historical monument.

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