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Axial Impact Load of a Concrete-Filled Steel Tubular Member with Axial Compression Considering the Creep Effect

機(jī)譯：考慮蠕變效應(yīng)的軸向受壓鋼管混凝土構(gòu)件的軸向沖擊載荷

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The dynamic loads acting on concrete-filled steel tubular members under axial impacts by rigid bodies were studied herein by FEM. The whole impact process was simulated and the time history of the impact load was obtained. The effects of eight factors on the axial impact load were studied; these factors were the impact speed, mass ratio, axial pressure ratio, steel ratio, slenderness ratio, concrete strength, impact position, and boundary conditions. Besides this, the effects of concrete creep on the impact load were also considered by changing the material parameters of the concrete. The results show that axial impact load changes with time as a triangle. The peak value of impact load increases and the impact resistance improves with the growth of the axial pressure ratio, steel ratio, slenderness ratio, and concrete strength after creep occurs. As the eccentricity of the axial impact acting on a concrete-filled steel tubular member increases, the peak value of the impact load decreases. The enhancement of constraints at both ends of the member can improve the impact resistance. The creep reduction coefficients for the peak axial impact load of a concrete-filled steel tubular member under axial compression and considering the creep effect over 6 months and 30 years are 0.60 and 0.55, respectively. A calculation formula for the peak value of impact load was suggested based on the existing formula, and its accuracy was proved by finite element calculation in this study.
機(jī)譯：本文通過有限元法研究了剛體在軸向沖擊下作用于鋼管混凝土構(gòu)件的動載荷。模擬了整個沖擊過程，并獲得了沖擊載荷的時間歷程。研究了八個因素對軸向沖擊載荷的影響。這些因素是沖擊速度，質(zhì)量比，軸向壓力比，鋼比，細(xì)長比，混凝土強(qiáng)度，沖擊位置和邊界條件。除此之外，還通過更改混凝土的材料參數(shù)來考慮混凝土蠕變對沖擊載荷的影響。結(jié)果表明，軸向沖擊載荷隨時間呈三角形變化。隨著軸向壓力比，鋼比，細(xì)長比和蠕變發(fā)生后混凝土強(qiáng)度的增加，沖擊載荷的峰值增加，抗沖擊性提高。隨著作用在填充混凝土的鋼管構(gòu)件上的軸向沖擊的偏心率增加，沖擊載荷的峰值減小。構(gòu)件兩端的約束的增強(qiáng)可以提高抗沖擊性。鋼管混凝土構(gòu)件在軸向受壓時的峰值軸向沖擊載荷的蠕變減小系數(shù)分別為0.60和0.55，其中考慮了6個月和30年的蠕變效應(yīng)。在現(xiàn)有公式的基礎(chǔ)上，提出了沖擊載荷峰值的計算公式，并通過有限元計算證明了其準(zhǔn)確性。

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