Seismic and Wind Performance of Five-Storied Pagoda of Timber Heritage Structure
Seismic and Wind Performance of Five-Storied Pagoda of Timber Heritage Structure
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DOI：
10.4028/www.scientific.net/amr.133-134.79
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发表时间：
2010-10
期刊：
影响因子：
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通讯作者：
T. Hanazato;C. Minowa;Y. Niitsu;K. Nitto;N. Kawai;Hideyuki Maekawa;M. Morii
中科院分区：
文献类型：
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作者：
T. Hanazato;C. Minowa;Y. Niitsu;K. Nitto;N. Kawai;Hideyuki Maekawa;M. Morii
在日本，共有22座五层木塔，建于19世纪中叶之前。所有这些塔都被日本政府登记为重要文化遗产，其中一些被列入世界文化遗产，如建于世纪末的法隆寺塔。地震区的木塔在长期的历史中经受住了地震的考验，人们对其抗震能力的研究已有世纪。然而，木塔在大地震作用下的实际动力行为需要记录以了解其抗震性能。此外，一个有趣的结构问题，最近出现了传统的五层木塔的抗风能力，因为这种高大的木结构可能会受到强风的严重影响。为了记录地震和台风时的实际动态，我们一直在东京附近的市川市的北京寺进行地震和风力监测，这座寺庙不仅经历了大地震，而且还经历了严重的台风。因此，虽然地震监测已经通过利用加速度计的常规方法完成，但是结构对风的响应的动态位移已经通过采用使用LED标记和CCD照相机的图像处理系统的新技术直接测量，因为风响应通常包括更长的周期分量，因此，通过加速度计精确地测量风响应一定是困难的。本论文的范围是：1）回顾过去的研究，以了解五层木塔的优异抗震性能，以及介绍我们自2007年以来成功进行的地震和风监测研究项目，（二）解释这些监测记录，这将有助于了解幸存下来的遗产木塔的地震和风性能，3）展示了历史建筑水平位移的长期监测记录。
In Japan, there exist a total of 22 five-storied timber pagodas constructed before the middle of 19 centuries. All of those pagodas are registered as the important cultural heritages by Japanese Government, while some of them are listed in World Cultural Heritages such as Horyu-ji Temple’s Pagoda that was built in the end of 7th century. As those timber pagodas in seismic areas have survived against earthquakes during their long histories, their earthquake resistant capacity has been studied for a century. However, the actual dynamic behaviors of timber pagodas subjected to large earthquakes should be recorded to understand the seismic performance. Furthermore, an interesting structural issue has recently risen of wind resistant capacity of traditional five-storied timber pagodas, as such tall timber structures may be severely affected by strong wind. In order to record the actual dynamic behaviors during not only earthquakes but also typhoons, we have been conducting earthquake and wind monitoring at Hokekyou-ji Temple in Ichikawa City, next to Tokyo, which has survived for 4 centuries against not only large earthquakes but also severe typhoons. Hence, while the earthquake monitoring has been done by the conventional method utilizing accelerometers, the dynamic displacement of the structural response to wind has been directly measured by a new technique employing an image process system using LED makers and CCD camera, because the wind response includes much longer period component in general, therefore, it must be difficult to measure accurately the wind response by accelerometers. The scope of the present paper are 1) to review the past studies to understand the excellent earthquake resistance of five-storied timber pagodas, as well as, to introduce our research project of seismic and wind monitoring that has been successfully conducted since 2007, 2) to interpret those monitoring records which would be useful for understanding seismic and wind performance of the heritage timber pagodas that have survived for many centuries with describing the simulation analysis of seismic response, and 3) to show the long term monitoring records of the horizontal displacement of the heritage structure.