原子炉建屋立体耐震壁の復元力特性に関する研究 : (その3)荷重変形関係履歴ループの検討

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  • RESTORING FORCE CHARACTERISTICS OF REACTOR BUILDINGS BASED ON LOAD TESTS AND NUMERICAL ANALYSIS : (Part 3) Examination of load displacement hysteresis loops
  • 原子炉建屋立体耐震壁の復元力特性に関する研究-3-荷重変形関係履歴ループの検討
  • ゲンシロ タテヤ リッタイ タイシンヘキ ノ フクゲンリョク トクセイ ニ カ

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This paper presents the formulas for calculating the load-displacement relation of reinforced concrete reactor buildings based on the results obtained from load tests using reduced scale model tests. Since the second half of the 1970s, from the viewpoint of the rationalization and economy of the designs of reactor buildings, evaluation of building safety was tried to confirm that the response value of the reactor building has sufficient margin for the final stage. For that purpose, the properties of the building up to final stage should be understood. The relation between the lateral load and displacement is an important measure to understand these properties. In dynamic response analysis of earthquake-resistant design, the relation between lateral load and lateral displacement are idealized by envelope curves and hysteresis loops. Lateral displacement consists of shear and bending components. Shear displacement is obtained from the proposed relation between shear stress τ and shear strain γ, and the bending displacement is obtained from the relation between moment M and curvature φ. Formulas for calculating the τ〜γ envelope curves were proposed in Part 1 and those for calculating the M 〜 φ envelope curves, in Part 2. This paper describes the algorithms for constructing hysteresis loops using third order and multi-linear functions. Under cyclic load at identical displacement to that previously experienced, load-displacement plots will be stable loops. As Ogawa proposed, normalized stable loops can be idealized with a pair of third order functions (Ref. 1). The coefficients of the third order functions for shear displacement and bending displacement are determined from the experimental data. When the velocity changes from negative to positive, for example, the trace forms a branced curves. The function for forming the branched curve are also proposed. As the third order function model was not practical for response analysis of multi-degree-of-freedom systems, the version of multi-linear model was prepared. . Lateral load-lateral displacement curves which were obtained from load tests were compared with those of the individual specimens obtained from the proposed formulas. The computed curves show good agreement with the experimental ones. (Ref. 1; Ogawa, J., et al., "Experimental Study on Dynamic Characteristics of R/C Frame", Summaries of Technical Papers of AIJ 1968 (in Japanese))

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