ブックタイトル「煉瓦造建造物の保存と修復」英語版

概要

「煉瓦造建造物の保存と修復」英語版

? CollapseEarthquakes may cause destruction of the entire structure ora part of the building (“half-destruction”). In recent earthquakes,owing to the fact that many buildings have now been reinforced,damage to most buildings were limited to half-destruction.Earthquake damage ranges from partial collapse includingfallen roof tiles and brick elements to total collapse wherepenetrating cracks and shear cracks on walls lead to severedamage with the building no longer being able to resist loads(photo 2-17).Particularly because masonry structures are made up ofbuilding materials that have been introduced after the start ofthe Modern era, there are variances in material quality whichmay cause damage in unexpected places. Also, there have beenmany cases of cracks appearing on chimneys, gable pediments,and arch construction or even their collapse after earthquakes(photo 2-18).photo 2-17 Destruction of the entire structure, Building on Lot No.15 in theFormer Foreign Concession in Kobe（Reference：旧神戸居留地十五番館災害復旧工事報告書）photo 2-18Destruction of fallen chimney? LeaningLeaning walls are induced by the ground settling orenlargement of cracks. Ground subsidence may occur dueto passing of years or large-scale drilling at a site nearby.Leaning of the building from cracks tend to occur whenaftershocks continue to enlarge the extant cracks (photo2-19). In chimneys such as those seen in photo 2-20, leaningor twisting may appear. In photo 2-21, cracks caused byearthquakes gradually expanded, causing the wall to leanoutward.photo 2-19Cracked gable and leaned wall（blue lines：cracks）photo 2-20Brick chimney leaned due to deterioration over timephoto 2-21 Cracks have appearered in the corner of a brick building in verticaldirection, and wall is leaned outward.（blue lines：cracks）87