Out-of-Plane Performance of Strengthened Unreinforced Brick Wall of Historic Buildings

• Main Authors: Yu-chun Lin, 林裕鈞
• Other Authors: Ja-shian Chang
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/14792179994264532598

碩士 === 國立成功大學 === 建築學系碩博士班 === 95 === In Taiwan, large part walls of historic buildings are constructed of bricks. The brick wall is not only used to enclose the building or to part the room, in structure, it also act as a major element for resisting the earthquake excitation. The structural behavior of brick wall, in general, has good capability to resist in-plane earthquake load, however, under out-of-plane earthquake load, serious damage caused by collapsing or overturning is often found. For improving this problem, so far, only scarcely study has been executed in Taiwan, especially for the brick wall of historic building. In this thesis, for the conservation purpose, a series of test of brick wall has been conducted. The investigation concentrates at the out-of-plane damage behavior of strengthened brick walls. The walls are constrained in the two vertical edges and lower edge. The strengthening methods adopted in this study can be divided in three categories. The first category applies confine member along the upper edge of wall. The confine member includes steel plate and U shape steel cover beam. The second category applies horizontal band of carbon fiber, glass fiber, and stainless wire mesh to strengthen the upper edge of the brick wall. The third category uses both of horizontal and vertical bands to strengthen the wall in two directions. Totally, there are 9 brick specimens (215cmx154cmx11cm) are made and tested under statically horizontal load. According to the experiment, the damage mode of the unreinforced specimen is formed by following stages: (1) a major central vertical crack occurred; (2) two inclined cracks extending from the central crack to the corner of wall specimen; (3) finally, an U-shape crack near the three constrained edges is observed. The specimens strengthened by confine members have shown an increase of 100% for ultimate load. The specimens strengthened by horizontal bands have the increase of 40%~100%, depending on the band materials used. For the specimens strengthened by horizontal bands associated with vertical bands, an ultimate load that increases 90~200% is obtained.