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    蘇州混凝土水泥制品研究院有限公司

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    水泥混凝土制品

    通電加速銹蝕后彈卡式連接接頭預制樁抗彎性能研究
    通電加速銹蝕后彈卡式連接接頭預制樁抗彎性能研究
    • 劉偉揚1,龔順風1,徐銓彪2, 3,陳 剛2, 3,劉承斌1,樊 華4
    2021年第5期
    摘要
    引用本文
    摘 ? 要:為研究彈卡式連接預應力混凝土方樁在濱海環境下長期工作的耐久性能,對彈卡式連接與傳統焊接式連接方樁接頭試件進行了通電加速銹蝕試驗,并對劣化后兩種方樁接頭試件進行了抗彎性能試驗。結果表明:劣化后的彈卡式連接方樁接頭試件整體連接性能保持完好,其開裂彎矩和極限彎矩試驗值與樁身理論計算值較接近,試件受彎破壞形式為接頭底部被拉開,彈卡連接件中插桿從小套筒中拔出而破壞;劣化后的焊接式連接方樁接頭試件焊縫連接處銹蝕嚴重,其開裂彎矩和極限彎矩試驗值相較樁身理論計算值下降幅度較大,試件受彎破壞形式為接頭底部連接焊縫直接拉開,跨中接頭底部兩側端板完全脫離。 Abstract: In order to study the long-term durability of prestressed concrete square piles with resilient clamping connection in coastal environments, the accelerated corrosion tests were conducted on prestressed concrete square piles with resilient clamping connection and traditional welded connection, and the flexural performance tests of two kinds of square pile joint specimens were conducted. The results show that the overall connection performance of the deteriorated square pile joint specimens with resilient clamping connection remains intact and the test values of cracking moment and ultimate moment are close to the theoretical calculation values of the pile body. The flexural failure mode of the specimens is that the bottom of the connection joint is pulled apart, and the inserting rod in resilient clamping connector is pulled out from the small sleeve. However, the weld seam of the welded square pile joint specimens are corroded seriously. Compared to the theoretical values, the cracking and ultimate bending moment of the welded square pile joint specimens after corrosion deterioration are significantly reduced. The flexural failure mode of the specimen is that the connecting weld seam at the bottom of the joint is pulled apart, and the end plates on both sides of the bottom are completely separated.
    劉偉揚,龔順風,徐銓彪,等.通電加速銹蝕后彈卡式連接接頭預制樁抗彎性能研究[J].混凝土與水泥制品,2021(5):33-38. LIU W Y,GONG S F,XU Q B,et al.Study on Flexural Performance of Prestressed Concrete Square Pile with Resilient Clamping Connection Joint After Electricity Accelerates Corrosion[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):33-38.
    預制裝配式混凝土電纜溝力學性能數值模擬分析
    預制裝配式混凝土電纜溝力學性能數值模擬分析
    • 胡 堅,吳 軍,章志鴻,趙 強
    2021年第5期
    摘要
    引用本文
    胡堅,吳軍,章志鴻,等.預制裝配式混凝土電纜溝力學性能數值模擬分析[J].混凝土與水泥制品,2021(5):39-42. HU J,WU J,ZHANG Z H,et al.Numerical Simulation Study on Mechanical Performance of Prefabricated Concrete Cable Pits[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):39-42.
    預制蝶形腹板混凝土箱梁抗彎性能研究
    預制蝶形腹板混凝土箱梁抗彎性能研究
    • 焦廣如,陳建兵,張云飛
    2021年第5期
    摘要
    引用本文
    摘 ? 要:為了解預制蝶形腹板混凝土箱梁在荷載作用下的受力特點、破壞形態、變形能力以及腹板中鋼筋內力分布等情況,設計制作了預制蝶形腹板混凝土箱梁試件,并對其受彎性能進行了試驗研究,采用對稱加載,得到了完整的荷載-撓度曲線,沿高度縱向應變曲線、鋼筋屈服曲線、沿縱向跨徑方向撓度曲線。研究表明,在對稱荷載作用下,預制蝶形腹板混凝土箱梁表現為彎曲破壞,同時,伴隨著彎剪斷腹板接縫處出現斷裂,結構失效。針對撓度,對比分析了費氏空腹理論變形公式計算值、有限元分析值和試驗值,三者吻合性良好,研究結果可為預制蝶形腹板混凝土箱梁的進一步研究和工程應用提供參考。 Abstract: In order to understand the precast butterfly wen box girder stress characteristics, failure form, deformation capacity and internal force distribution of the steel bars in the web, a ?precast butterfly web concrete box is designed and manufactured. The beam model specimens are loaded with symmetrical distribution to obtain a complete load-deflection curve, along the height longitudinal strain curve, the steel bar yield curve, and the deflection curve along the longitudinal span direction, to conduct experimental research on its bending performance. The results have shown that under the action of symmetrical loads, the butterfly-shaped web box girder fails in bending, and the joints of the webs are broken together with the bending and shearing, resulting in structural failure. According to the deformation formula deduced by Fischer’s fasting principle and the comparative analysis between the finite element simulation value and the test value, the coincidence performance is good. The actual measurement results verify the rationality of the finite element and theoretical formulas, and the research results can provide a reference for the further research and engineering application of the butterfly web box girders.
    焦廣如,陳建兵,張云飛.預制蝶形腹板混凝土箱梁抗彎性能研究[J].混凝土與水泥制品,2021(5):43-47. JIAO G R,CHEN J B,ZHANG Y F,et al.Study of Bending Performance of Precast Butterfly Web Concrete Box Girders[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):43-47.
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