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Seismic performance of unreinforced and confined masonry structures [Elektronski vir] : shear resistance and displacement capacity
Tomaževič, Miha
Shear failure, characterized by the occurrence of diagonally oriented cracks, is a typical failure mode of unreinforced and confined masonry walls subjectedto in-plane seis-mic loads. The results of ...recent experimental studies have been used to compare the results obtained by typical calculation methods with actual situation. It has been shown that the va-lidity of most commonly used equations is limited to specific cases and mechanisms on the basis of which they have been developed. The results of lateral resistance tests of masonry walls and shaking table tests of a number of models of masonry buildings of various struc-tural configurations, built with various materials in different construction systems, have been analyzed to find a correlation between the occurrence of different grades of damage to struc-tural elements, characteristic limit states and displacement capacity. Taking into considera-tion the correlation between the acceptable level of damage and actual displacement capacity of unreinforced and confined masonry structures, the ranges of values of elastic force reduc-tion factor, used to determine the design seismic loads for different masonry construction sys-tems, have been evaluated. It has been shown that the values, proposed by the recently adopted European standard for earthquake resistant design, are somewhat conservative even in the case where mechanism models and the analysisof the pushover type are used for seis-mic resistance verification.
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