Flexural Analysis Combined with Freeze-thaw Depth for Reinforced Concrete Beams and Columns
Flexural Analysis Combined with Freeze-thaw Depth for Reinforced Concrete Beams and Columns
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DOI：
10.3151/jact.20.18
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发表时间：
2022-01
影响因子：
2
通讯作者：
T. Kanazawa;Takuro Nakamura;Jun'ichi Sakaguchi;K. Kawaguchi
中科院分区：
文献类型：
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作者：
T. Kanazawa;Takuro Nakamura;Jun'ichi Sakaguchi;K. Kawaguchi
基于上限定理，建立了钢筋混凝土梁柱在冻融作用下抗弯分析的运动学模型。当实际劣化剖面被理想化为基于混凝土芯样冻融深度的未破损和破损区的组合时，所建立的模型能够解析地推导出破损混凝土的贡献。通过与现有的21根冻融后受弯破坏的钢筋混凝土柱和梁的对比分析，验证了分析的准确性。预测结果与试验结果吻合较好，平均误差在6%以内。此后，发展的分析预测了钢筋混凝土梁的极限弯矩能力，该梁取自因冻害和疲劳的共同作用而被替换的既有桥板。结果表明，本文的分析可以支持对是否需要修复或康复的合理决策。本文是作者前作[Kanazawa，T.，Nakamura，T.，Sakaguchi，J.和Kawaguchi，K.，(2021)]的英译本。“钢筋混凝土线性构件的抗弯分析与冻融深度相结合。”日本土木工程师学会杂志。E2(材料和混凝土结构)、77(4)、177-186。(日语)]。
This study presents a kinematic model for flexural analysis of RC beams and columns subjected to freeze-thaw action based on upper bound theorem. The developed model enables analytical derivation of the contribution of damaged concrete when actual deterioration profile is idealized as an assemblage of undamaged and damaged zones based on freeze-thaw depth obtained from concrete core specimens. The accuracy of the analysis is verified by comparing its predictions with available 21 RC columns and beams failing in flexure after freeze-thaw exposure. The predicted results show good agreement with the test results within error of 6% on average. Thereafter, the developed analysis predicts the ultimate moment capacity of a RC beam, which was taken from an existing bridge slab replaced because of the combined effect of frost damage and fatigue. Results demonstrate that the present analysis could support a rational deci-sion-making regarding the need for repair or rehabilitation. This paper is the English translation from the authors’ previous work [Kanazawa, T., Nakamura, T., Sakaguchi, J. and Kawaguchi, K., (2021). “Flexural analysis combined with freeze–thaw depth for RC linear members.” Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) , 77(4), 177-186. (in Japanese)].