Displacement capacity of masonry buildings as a basis for the assessment of behavior factor: an experimental study |
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Authors: | Miha Tomaževič Polona Weiss |
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Institution: | (1) Slovenian National Building and Civil Engineering Institute, Dimičeva 12, 1000 Ljubljana, Slovenia |
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Abstract: | The results of shaking table tests of a series of 1:5 scale masonry building models have been used for the assessment of values
of structural behavior factor q for masonry structures, seismic force reduction factors proposed for the calculation of design seismic loads by Eurocode
8, European standard for the design of structures for earthquake resistance. Six models have been tested, representing prototype
buildings of two different structural configurations and built with two different types of masonry materials. The study indicated
that the reduction of seismic forces for the design depends not only on the type of masonry construction system, but also
on structural configuration and mechanical characteristics of masonry materials. It has been also shown that besides displacement
and energy dissipation capacity, damage limitation requirement should be taken into account when evaluating the values of
behavior factor. On the basis of analysis of experimental results a conclusion can be made, that the values at the upper limit
of the proposed range of values of structural behavior factor q for unreinforced and confined masonry construction systems are adequate, if pushover methods are used and the calculated
global ductility of the structure is compared with the displacement demand. In the case where elastic analysis methods are
used and significant overstrength is expected, the proposed values are conservative. However, additional research and parametric
studies are needed to propose the modifications. |
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