Timber Framed Masonry buildings, an earthquake resistance...
Transcript of Timber Framed Masonry buildings, an earthquake resistance...
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Timber Framed Masonry buildings,
an earthquake resistance influenced
traditional architecture
Andreea DUTU, Hiroyasu SAKATA,
Yoshihiro YAMAZAKI and Tomoki SHINDO
Tokyo Institute of Technology Sakata Laboratory
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Sakata Laboratory
Summary
1. Introduction
2. Study on existing buildings
3. Retrofit solution for heritage buildings with TFM structure
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France
Timber framed masonry (TFM) buildings in non-seismic countries
United kingdom Denmark
Germany Czech Republic
Heritage
buildings
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Portugal
India Italy
Greece
Turkey
Romania
Haiti
Heritage
buildings
Sakata Laboratory
Japan China
Timber framed masonry (TFM) buildings in seismic countries
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Sakata Laboratory
Summary
1. Introduction
2. Study on existing buildings
3. Retrofit solution for heritage buildings with TFM structure
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Lushan 2013 earthquake, China [Qu Z., Dutu A., Zhong J. Sun J., (2014) “Seismic Damage of Masonry Infilled Timber Houses in the 2013 M7.0 Lushan Earthquake in China”, Earthquake Spectra In press] Sakata Laboratory
Recent earthquakes showed TFM houses exhibit slight to moderate, but
don’t usually collapse. The damages are due to poor construction details
and/or biological degradation. Out of plane collapse of the masonry
panels also occurred, without producing total collapse.
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Slide at column base
Fractured beam end
Pulled-out tennon
Sakata Laboratory
Poor construction details for the connections
Lushan 2013 earthquake, China [Qu Z., Dutu A., Zhong J. Sun J., (2014) “Seismic Damage of Masonry Infilled Timber Houses in the 2013 M7.0 Lushan Earthquake in China”, Earthquake Spectra In press]
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Port-au-Prince 2010 earthquake, Haiti [Langenbach R., Kelley S., Sparks P., Rowell K., Hammer M., Julien O. J. (2010), “Preserving Haiti’s Gingerbread Houses”, 2010 Earthquake Mission Report] Sakata Laboratory
Less than 5% of TFM houses (Gingerbread) collapsed. The rest of
them experienced light to moderate damages, just like in the Lushan
earthquake, most likely due to poor construction details.
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Sakata Laboratory
Experimental study on TFM mechanical behaviour – Tokyo Tech
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Loading protocol – CUREE – Caltech standard protocol
Sakata Laboratory
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Sakata Laboratory
Hysteresis of the TFM wall (S2 specimen)
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Component materials tests
Sakata Laboratory
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Sakata Laboratory
Experimental study vs. FEM analysis
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Conclusions:
TFM is very ductile! The masonry ensures strength and stiffness, while
timber is responsible for the significant deformation capacity;
The key points are the weak mortar and the embedment of the timber;
Numerical modeling with FINAL software was successful, but it needs
to be simplified.
Considering the fact that for some countries the TFM are important
heritage… we must protect them even from experiencing those light to
moderate damages. So we further focused on a strengthening method
using AFRP sheets.
Sakata Laboratory
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Sakata Laboratory
Summary
1. Introduction
2. Study on existing buildings
3. Retrofit solution for heritage buildings with TFM structure
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S2 S3
S4 S5
Sakata Laboratory
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Sakata Laboratory
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Conclusions:
AFRP retrofit is beneficial for strength and stiffness of TFM;
It is a suitable method for TFM walls located at the interior of the
building, or if they are covered with finishing;
FRP is very easy to apply;
Simplified evaluation method estimates the contribution of the
application of one AFRP strip as an increase of almost 15 kN to the
shear strength of the wall;
Design method will further be developed.
Sakata Laboratory
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Acknowledgements:
The financial support of the Japan Society for Promotion of Science
(JSPS) postdoctoral research grant no. PE 13092
Materials and technology supplied by FIBEX and ASAHI BOND
companies
Master and PhD students of Sakata Lab that helped with all the
experiments.