五層鉄筋コンクリート造建物実験で観察されたひび割れ性状とその数値シミュレーション

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  • CRACKS OBSERVED IN LOADING TEST ON FIVE-STORY REINFORCED CONCRETE BUILDING SPECIMENS AND THEIR NUMERICAL SIMULATION
  • ゴソウ テッキン コンクリートゾウ タテモノ ジッケン デ カンサツ サレタ ヒビワレ セイジョウ ト ソノ スウチ シミュレーション

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<p> According to the Guidelines for Performance Evaluation of Earthquake Resistance Reinforced Concrete Buildings published from the Architectural Institute of Japan, damage state of RC members is defined by concrete/steel stress level, residual deformation/ crack width. However, these indices are not enough to evaluate repair strategy. In this study, crack simulation procedure is introduced for building performance design method based on damage evaluation. Crack width/ length/ spacing in the tests on two full-scale five story RC buildings were extracted and quantified. Crack width/ length observed in the tests were numerically simulated with finite element analysis.</p><p> As to flexural crack, on the premise that concrete between cracks does not deform, flexural crack width measured in the tests and tensile elongation on tensile fiber are compared taking cyclic loading effect into consideration and accumulated flexural crack width has good agreement with accumulated flexural elongation. This result shows that the assumption which concrete between cracks does not deform under tensile stress is reasonable enough. Total shear crack width (shear deformation) and maximum shear crack width are analyzed with test result. Shear deformation of members is compared to shear deformation which comes from shear crack width via geometric model and it has been discovered that shear deformation which comes from shear crack width was less than shear deformation of members and that means shear deformation of members does not consist of only shear crack width. Therefore, other component can contribute to shear deformation of members. Relationship between maximum shear crack width and total shear crack width is examined with an equation in CEB-FIP model code 1987 and the equation can well simulate total and maximum shear crack relationship. However, shear portion of flexure shear crack is not well simulated because it is not pure shear crack and opens by flexural deformation. Therefore, the issue is how to deal flexure shear cracks.</p><p> According to those examination, relationship between flexural crack width and elongation on tensile fiber has been found except relationship between shear deformation and shear crack width. Therefore, flexural crack is simulated with FEM analysis.</p><p> Flexural crack width measured in the tests is compared with computed flexural crack width and well simulated. However, some cracks were not measured due to concrete spalling at 1.0% roof drift. Thus, flexural crack width was over estimated. On the other hand, in this study, elongation on tensile fiber corresponds to flexural crack width. Therefore, it is compared to computed flexural crack width. Accumulated elongation is well simulated and total elongation is simulated within ±30% error. It shows this method well predict flexural crack width except effect of concrete spalling. Maximum flexural crack width is simulated approximately within ±30% error as well. Flexural crack length is also simulated with the method based on Bernoulli-Euler theory and compared on crack length ratio. Cracks progress horizontally such as pure flexural crack is well simulated. However, cracks progress obliquely such as flexure shear crack is not well simulated due to the deference of propagation manner between test and numerical simulation.</p>

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