Modern Design Method for Structural Analysis of Masonry Buildings in the Seismic Areas

Abstract eng:
Romania is a country with a high seismic risk, two important seismic regions in Vrancea and Banat existing on the territory. For seismic design of the buildings, the territory of the country was divided in 7 seismic hazard zones, with different intensity of design earthquake ag=0.8÷0.32g. Every hazard zone has seismic design rules to realize the structure of the buildings: antiseismic conformation, number of levels, characteristics of the materials, characteristics of design earthquake etc. In zones with reduced seismic hazard, the masonry buildings can have an unreinforced masonry (URM) structure, but with a low height (1, 2 levels) or reinforced or confined masonry (RM) structure with multilevel height (3, 4 levels). In zones with high seismic risk, the masonry structures must have only reinforced masonry and reduced height. In Romania are yet many old buildings over hundred years, which were not designed after seismic codes. These buildings, historical monuments, cannot be demolished and must be retrofitted by different methods to ensure the resistance and stiffness of the structure according with the actual design codes; one of this methods frequently used in our country is retrofitting of the shear masonry walls by jacketing with cement-mortar and ductile reinforcement steel. Sometimes, the building have wooden floor, who must be replaced with rigid concrete floor diaphragm.

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