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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

    預應力鋼筒混凝土管極限內壓與損傷機理研究
    預應力鋼筒混凝土管極限內壓與損傷機理研究
    • 李海珍1,馮 新1,張 寬1,劉賢良2
    2021年第12期
    摘要
    引用本文
    摘 ? 要:通過建立運行期管線及其周圍土體的非線性有限元模型,研究了預應力鋼筒混凝土管(PCCP)在極限內壓荷載下的損傷演化規律。結果表明:管線在工作壓力及設計壓力荷載下均可安全運行;隨內水壓力的進一步增加,管芯由受壓轉變為受拉狀態,進而出現(微)裂縫損傷,且材料損傷先在管芯內側出現,管芯損傷后鋼筒應力迅速增加直至達到其屈服強度,達到彈性極限狀態;在極限內壓下埋地管線內外層材料失效位置不同,但材料損傷均由插口端向管體中部延伸。研究成果可為遭受水錘作用PCCP管線的損傷評價提供參考。 Abstract: The nonlinear finite element model of pipeline was established including its surrounding soil, then the material damage and damage mechanism of the pipeline under the limit internal pressure load were analyzed. The results show that the pipe can operate safely under the working internal pressure and the design pressure in both cases. With increasing of internal water pressure, the concrete core transforms into tension state, and then (micro) crack damage in inner side occurrs first. Due to the material damage of the pipe core, the stress of the steel cylinder increases rapidly until it reaches its yield strength. The damage position of each material is different under the combined loads, however, the damage is both extended from the spigot end to the middle of the pipe. The finding can provide a reference and suggestions for damage assessment of in-service PCCP.
    李海珍,馮新,張寬,等.預應力鋼筒混凝土管極限內壓與損傷機理研究[J].混凝土與水泥制品,2021(12):29-33,41. LI H Z,FENG X,ZHANG K,et al.Investigation on Ultimate Internal Pressure and Damage Mechanism of PCCP[J].China Concrete and Cement Products,2021(12):29-33,41.
    環形超高性能混凝土制品離心成型試驗研究
    環形超高性能混凝土制品離心成型試驗研究
    • 黃福云1,桂 奎1,林 潮2,黃 偉1,馬 宇1,楊芳芳1
    2021年第12期
    摘要
    引用本文
    摘 ? 要:為改善環形UHPC制品離心成型質量問題,試驗研究了水膠比、鋼纖維摻量、減水劑、骨料摻量等因素對環形UHPC制品離心成型質量的影響。試驗室研究結果表明:單摻細骨料UHPC制品隨著水膠比的增大,其壁厚不均勻度也隨之增大,制品離心成型難度也越大;雙摻細骨料UHPC制品隨著水膠比的增大,其壁厚不均勻度基本呈現先減小后增大的趨勢;適宜雙摻細骨料UHPC制品離心成型的水膠比范圍比單摻細骨料UHPC制品的大;減水劑用量宜為1.2%~1.5%,當減水劑用量超過2.0%時,制品無法成型;含粗骨料UHPC制品的水膠比范圍宜為0.16~0.17,鋼纖維摻量與粗骨料體積含量呈反比關系,骨料的摻加能防止鋼纖維“跑偏”,減少鋼纖維集中分布在最外層現象的發生;采用離心成型工藝,單摻細骨料UHPC制品的混凝土坍落度宜控制在90~150 mm,雙摻細骨料UHPC制品的混凝土坍落度宜控制在120~180 mm。 Abstract: In order to improve the insufficient centrifugal forming of UHPC pipe structure, the test parameters include water binder ratio, steel fiber content, water reducing agent, aggregate content, etc. on the experimental study of UHPC circular products by cemtrifugal forming were carried out. The results show that with the increase of water-binder ratio, the wall thickness unevenness of single mixed fine aggregate UHPC products increases, and the products are more difficult to centrifugal molding. With the increase of water-binder ratio, the wall thickness of double mixed fine aggregate UHPC products basically shows a trend of decreasing first and then increasing, and the range of water-binder ratio of double mixed fine aggregate UHPC products is larger. The dosage of water reducing agent should be 1.2%~1.5%. When the dosage exceeds 2.0%, the products are not formed. The recommended water-binder ratio should be 0.16~0.17, the volume content of steel fiber and coarse aggregate is inversely proportional, in order to prevent the deviation of steel fiber and reduce the phenomenon of steel fiber concentrated in the outermost layer, the slump range of single mixed fine aggregate UHPC products is 90~150 mm and the double mixed fine aggregate UHPC products is 120~180 mm.
    黃福云,桂奎,林潮,等.環形超高性能混凝土制品離心成型試驗研究[J].混凝土與水泥制品,2021(12):34-41. HUANG F Y,GUI K,LIN C,et al.Experimental Study on Circular Ultra-high Performance Concrete Products Using Centrifugal Forming[J].China Concrete and Cement Products,2021(12):34-41.
    預制混凝土勁性復合樁地基設計及有限元分析
    預制混凝土勁性復合樁地基設計及有限元分析
    • 王 亭1,曹 陽2,李建立3,張志紅4
    2021年第12期
    摘要
    引用本文
    摘 ? 要:以夾砂層地質為研究背景,結合工程實例,采用規范計算、現場載荷試驗及ANSYS有限元分析方法,對預制混凝土勁性復合樁(PPRC勁性復合樁)地基進行了設計計算,并將結果進行了分析比較。結果表明,PPRC勁性復合樁單樁抗壓承載力試驗值與有限元分析結果較相近,且大于承載力設計值,PPRC勁性復合樁承載力特征值滿足設計要求;通過與水泥粉煤灰碎石樁(CFG樁)對比可知,PPRC勁性復合樁經濟優勢明顯,具有較好的推廣前景。 Abstract: Take the geology of site mezzanine layer as the background of the study and combine with the engineering examples, theoretical calculationsthe, static load tests and ANSYS finite element analysis were used to design iso-core PPRC strength composite pile. The results show that the test value of the single-pile pressure-resistant carrying capacity of the strength composite pile is similar to the analysis value of finite element,and greater than the carrying capacity design value. The composite foundation carrying feature value meets the design requirements. Through comparison and analysis with CFG pile composite foundation, it is found that the economic advantages of the PPRC strength composite pile composite foundation are obvious and have good prospects for popularization.
    王亭,曹陽,李建立,等.預制混凝土勁性復合樁地基設計及有限元分析[J].混凝土與水泥制品,2021(12):42-44,49. WANG T,CAO Y,LI J L,et al.Design and Finite Element Analysis on Foundation of PPRC Strength Composite Piles[J].China Concrete and Cement Products,2021(12):42-44,49.
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