鋼管混凝土柱受潛變及收縮影響研究

游雅如

doi:10.6342/NTU201902574

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鋼管混凝土柱受潛變及收縮影響研究

Study of the Influence of Creep and Shrinkage on Concrete Filled Steel Tubular Columns

游雅如 , Masters　　Advisor：陳振川　　

繁體中文 DOI： 10.6342/NTU201902574

鋼管混凝土柱；潛變；收縮；應力移轉；有限元素法； CFT ； creep ； shrinkage ； stress transfer ； finite element method

Abstract │ Reference (112) │ Altmetrics

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Concrete-filled steel tubular (CFT) columns show not only high strength and high ductility but also exhibit favorable seismic performance. Besides, CFT columns infilled with self-consolidating concrete (SCC) shorten construction time because of its self-compacting characteristics. As a result, these kind of structural members have been widely adopted in high-rise buildings in Taiwan. 
    The primary intent of concrete infill is to increase lateral stiffness of member and delay the local buckling of the steel tubular. However, in the recent future, engineers begin to incorporate concrete in materials subjected to axial load during design. Once concrete is subjected to load, development of concrete creep begins. In order to maintain the equilibrium of forces of CFT section, part of axial load of concrete will be transferred to steel tubular which leads to the growth of steel stress. Furthermore, with the ever-changing nature of technology, concrete compressive strength of SCC has reached up to 90 MPa. In general, the higher the concrete compressive strength is, the lower the water cement ratio is. Concrete with low water cement ratio intensifies the rise of steel stress in CFT columns on account of high autogenous shrinkage.
    A three-dimensional finite element model of CFT column, which takes account of the phenomenon of concrete creep and shrinkage, is developed to evaluate stress transfer between concrete and steel in ABAQUS. According to recent research, there is a characteristic of high amount of paste in concrete mix designs in Taiwan owing to the soft nature of coarse aggregates. It is not appropriate to directly adopt foreign prediction formulas which will lead to underestimate long term deformation of concrete in the CFT columns. Consequently, this study compares different creep and shrinkage prediction formulas for concrete to gain a better result of the research.
    The analysis results show that under the condition of initial steel stress of 0.6f_y, the final steel stress of CFT column is probably not qualified according to “Design and Technique Specifications of Steel Structures for Buildings” owing to the long term deformation of infilled concrete whether the load is eccentric or not. In the extreme case of high concrete compressive strength of SCC and high diameter to thickness ratio, the steel stress significantly exceeds the original design value with 0.33f_y. Apart from this, combination of high diameter to thickness ratio and low yield strength of steel should be avoided during design due to the considerable growth of steel stress. However, specifications among countries so far merely focus on the short term loading performances of CFT columns, while its time dependent behavior is deficient. It is suggested that relevant specifications should be revised in “Design Specifications and Commentary of Steel Reinforced Concrete Structures” in Taiwan.

Reference ( 112 ) 〈TOP〉

[1] Bazant, Z.P., Hubler, M.H., and Wendner, R., "Model B4 for creep, drying shrinkage and autogenous shrinkage of normal and high-strength concretes with multi-decade applicability," RILEM Technical Committee TC-242-MDC (2015).
[2] Bazant, Z.P. and Murphy, W.P., "Creep and shrinkage prediction model for analysis and design of concrete structures-model B3," Materiaux et constructions, Vol. 28, No. 180, pp. 357-365 (1995).
[3] 廖昱霖，「建置及應用資料庫以發展台灣自充填混凝土潛變預測公式」，碩士論文(指導教授：陳振川)，國立臺灣大學土木工程學研究所，台北 (2018)。
[4] 陸景文、陳振川、張國鎮,、詹穎雯，「台灣地區溫度對混凝土橋樑影響之監測與分析」，第593-604頁 (2001)。
[5] Hołowaty, J., "Creep and Shrinkage of Concrete in Eurocode 2 and Polish Bridge Standards—Necessity for Implementation," Journal of Civil Engineering and Architecture Vol. 9, pp. 460-466 (2015).

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