SEISMIC AND STRONG WIND RESPONSE OBSERVATION OF NATIONAL HERITAGE FIVE STORY WOOD PAGODA ADN ITS CONSIDERATION

-Part 1 Observation including 2011 Touhoku Off-Pacific Ocean Earthqukake response by Image processing-

Abstract

This Five Story Wooden Pagoda is high rise structure existing from ancient times to now. In this study, new observation systems consisting of image processing and vibration sensors was used. The five story pagoda which is national heritage and constructed in 1622, locates at the site of Hokekyouji Temple in Ichikawa city, adjacent to east side of Tokyo. Earthquake response observation indicated the dynamic relative displacement of 75mm in 0.2G ground motion in maximum. Wind response observation indicated the dynamic relative displacement of 40mm in wind speed of more than 30m/s, using high frequency pass filter of 0.3Hz. During large displacement response, the dominant period showed the increase from 1.25sec to 2sec. There were no major difference between the center column and the pagoda frame.