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<doi>/ISEC.res.2017.169</doi>
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<article-title>VIBRATIONAL PROPERTIES OF EARLY SHOWA<br/>
PERIOD BILLBOARD ARCHITECTURE FOR<br/>
RENOVATING DENSELY BUILT-UP WOODEN<br/>
HOUSE AREAS</article-title>
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<author>NORIKO TAKIYAMA, KOHEI HARA, RYO SANUKI, MASUMI MATSUMOTO,<br/>
TOMOYUKI GONDO, and SHIGERU AOKI</author>

<aff>Division of Architecture and Urban Studies, Tokyo Metropolitan University, Tokyo, Japan</aff>


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<title>ABSTRACT</title>
<p>We report the progress of our research on buildings and their surroundings for disaster
prevention in Chuo-3, Ota City, which is an area in Tokyo, Japan with densely built-up
wooden house areas. In a previous paper, we reported the results of an exhaustive
survey of 383 buildings and roads in the northwest area of Chuo-3. As a continuation,
in this paper, we present findings from an exhaustive survey of 426 buildings and
microtremor measurements on the ground in a more widespread area. As a result, we
found evidence of early Showa period billboard architecture. We subsequently
measured the dimensions of the billboard architecture and surveyed the materials of the
walls, roofs, windows, etc. Furthermore, we constructed a standard billboard
architectural model and conducted eigenvalue analysis to evaluate their respective
vibrational properties, such as the natural frequency and vibrational mode. Lastly,
sensitivity analyses were conducted on the floor rigidity or materials of the walls.</p>
<p><italic>Keywords: </italic>Eigenvalue analysis, Sensitivity analysis, Natural frequency, Vibrational
mode, Mortar wall, Eccentricity, Exhaustive survey.</p>
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