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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

    雙區域斷絲PCCP極限內水壓力及破壞模式研究
    雙區域斷絲PCCP極限內水壓力及破壞模式研究
    • 張 寬1,馮 新1,李海珍1,劉賢良2
    2022年第7期
    摘要
    引用本文
    摘 ? 要:為研究腐蝕斷裂對預應力鋼筒混凝土管(PCCP)失效的影響,建立了PCCP雙區域斷絲三維非線性管-土相互作用有限元模型,得到了不同間距軸向雙區域斷絲情況下管道的損傷演化、失效模式和極限承載能力。結果表明,斷絲區域間距越大,相互影響越小,當間距大于150 cm后,兩個區域之間基本沒有相互作用,其極限內水壓力與單區域斷絲的結果差別顯著。研究結果可為PCCP實際工程中的雙區域斷絲損傷評價及承載能力分析提供參考。 Abstract: In order to study the effect of corrosion fracture on the failure of prestressed concrete cylinder pipe (PCCP), the 3D nonlinear finite element model of PCCP with double-zone broken wires was established to investigate the structural responses and the ultimate internal pressure by considering the pipe-soil interaction. The results show that the greater the distance between the two regions, the smaller the mutual influence. When the interval is greater than 150 cm, it can be considered that there is no interaction between the two regions, and the ultimate internal pressure is much larger than that of the single-zone broken wires with the same axial length. The research results can provide the theoretical basis for multi-region broken wire damage evaluation and bearing capacity analysis in real applications.
    張寬,馮新,李海珍,等.雙區域斷絲PCCP極限內水壓力及破壞模式研究[J].混凝土與水泥制品,2022(7):45-49,68. ZHANG K,FENG X,LI H Z,et al.Study on Failure Modes and Ultimate Internal Pressure for PCCP with Double-zone Broken Wires[J].China Concrete and Cement Products,2022(7):45-49,68.
    鋼筋混凝土構件疲勞設計研究
    鋼筋混凝土構件疲勞設計研究
    • 許家婧,葉浩天,殷浩天,曹 慧,張邵峰
    2022年第7期
    摘要
    引用本文
    摘 ? 要:對比分析了國內外混凝土結構設計規范中關于疲勞設計的規定后發現:美國混凝土協會ACI 215R—74《疲勞荷載下混凝土結構設計規定》、日本土木工程學會JSCE 2007《混凝土結構設計規范》、我國GB 50010—2010《混凝土結構設計規范(2015年版)》均采用容許應力法進行鋼筋混凝土構件疲勞設計;美國公路運輸協會AASHTO LRFDUS—2017《高速公路橋梁設計規范》和歐洲CEB-FIP(2010)《混凝土結構規范》則采用疲勞極限狀態設計方法,考慮荷載和抗力系數,以結構使用壽命不超過失效壽命為原則進行鋼筋混凝土構件疲勞設計。在總結各國規范基礎上,提出了鋼筋混凝土構件的疲勞設計基本步驟,并進行了算例分析。 Abstract: Fatigue design codes of concrete structures from different countries were summarized and compared. It is found that the fatigue design methods are different. The American Concrete Institute standard ACI 215R—74 Considerations for Design of Concrete Structures Subjected to Fatigue Loading, Japan Society of Civil Engineers standard JSCE 2007Standard Specification for Concrete Structures and Chinese standard GB 50010—2010 Code for Design of Concrete Structures are based on allowable stress method. American Association of State Highway and Transportation Officials standard AASHTO LRFDUS—2017 Bridge Design Specifications and European Concrete Commission and International Prestressed Concrete Association standard CEB-FIP(2010) Model Code for Concrete Structures are based on fatigue limit state method, and the load and resistance coefficient are considered, and the fatigue design of reinforced concrete components is carried out on the principle that the service life of the structure does not exceed the failure life. In addition, the fatigue design procedures and the calculation example are provided.
    許家婧,葉浩天,殷浩天,等.鋼筋混凝土構件疲勞設計研究[J].混凝土與水泥制品,2022(7):50-54. XU J J,YE H T,YIN H T,et al.Study on Fatigue Design Methods of Reinforced Concrete Components[J].China Concrete and Cement Products,2022(7):50-54.
    再生混凝土免燒磚制備工藝研究
    再生混凝土免燒磚制備工藝研究
    • 孫洪浩1,劉紅梅1,2,郭 容1,張 健3,朱晨輝1
    2022年第7期
    摘要
    引用本文
    摘 ?要:利用廢棄混凝土再生細骨料及再生微粉,采用靜壓成型工藝制備了再生混凝土免燒磚,以抗壓強度和抗折強度為優化指標,分別對制磚成型工藝與養護工藝進行了研究。結果表明:再生混凝土免燒磚的強度隨著成型壓力和蒸汽養護時間的增加而增加;再生混凝土免燒磚的強度隨著壓制速度的增加而呈現下降趨勢;最佳成型壓力為15 MPa、壓制速度為0.6 mm/s、蒸汽養護溫度為80 ℃、養護時間為16 h。在此生產條件下,再生混凝土免燒磚的28 d抗壓強度為12.1 MPa。 Abstract: The recycled fine aggregate and recycled micro powder of waste concrete were used to prepare recycled baking-free brick by static pressure forming. Taking the compressive strength and flexural strength of recycled baking-free bricks as the optimization index, the forming process and curing process of recycled concrete baking-free bricks were studied respectively. The results show that the strength of recycled concrete baking-free bricks increases with the increase of molding pressure. The strength of recycled concrete baking-free bricks decreases continuously with the increase of pressing speed. The optimum molding pressure is 15 MPa, pressing speed is 0.6 mm/s and the steam curing system is 80 ℃ for 16 h. Under this condition, the 28 d compressive strength of recycled concrete baking-free bricks reaches 12.1 MPa.?
    孫洪浩,劉紅梅,郭容,等.再生混凝土免燒磚制備工藝研究[J].混凝土與水泥制品,2022(7):55-59. SUN H H,LIU H M,GUO R,et al.Study on Preparation Technology of Recycled Concrete Baking-free Bricks[J].China Concrete and Cement Products,2022(7):55-59.
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