00231327

open access

Version of Record

コウカン ブレース オ シヨウ シタ テイソウ RCゾウ ケンチクブツ ノ タイシン ホキョウ コウホウ ニ カンスル ジッケンテキ ケンキュウ

Experimental Study on Seismic Retrofit for Low Rise R/C Building by using CHS Bracing

Japanese (日本語)

神戸大学都市安全研究センター研究報告

4

271-289

神戸大学都市安全研究センター

2000-03

2007-04-11

An experimental study was carried out to examine the applicability of a seismic retrofitting method using steel tube external bracing for RC building. To evaluate an effectiveness of the method and to compare with other retrofitting methods, six types of specimen were prepared and tested: a bare RC specimen without any strengthening, a specimen strengthened by an internal steel frame without bracing, a specimen strengthened by an internal steel frame with wide flange bracing, a specimen strengthened by an internal steel frame with circular tube bracing, and two specimens strengthened by an external steel frame with single or double circular tube bracing. All the specimens were 1/3-scale models for one story-one bay substructure frame of a RC building. A strengthening steel frame was connected to a RC frame by mechanical anchors with mortar. In the tests, under a constant vertical load horizontal shear loads were cyclically applied to each specimen until drift angle reached about 3%. During the loading, behavior of the RC frame, the strengthening steel frame, and connection between those frames were measured. In this paper, results of the experiments so obtained are presented, and then compared with each other. Failure behavior of each specimen is summarized. The experimental results are also compared with analytical results. Through the experimental results and analytical results, an effectiveness of the retrofitting method using steel tube external bracing is discussed. It also becomes clear that the connection between a RC frame and a strengthening frame may be subjected to not only shear force but combined forces, which is especially significant for the external bracing method.

紀要論文