水泥混凝土制品_2022_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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水泥混凝土制品

双区域断丝PCCP极限内水压力及破坏模式研究

张宽1，冯新1，李海珍1，刘贤良2

2022年第7期

摘要

引用本文

摘要：为研究腐蚀断裂对预应力钢筒混凝土管（PCCP）失效的影响，建立了PCCP双区域断丝三维非线性管-土相互作用有限元模型，得到了不同间距轴向双区域断丝情况下管道的损伤演化、失效模式和极限承载能力。结果表明，断丝区域间距越大，相互影响越小，当间距大于150 cm后，两个区域之间基本没有相互作用，其极限内水压力与单区域断丝的结果差别显著。研究结果可为PCCP实际工程中的双区域断丝损伤评价及承载能力分析提供参考。 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.

张宽,冯新,李海珍,等.双区域断丝PCCP极限内水压力及破坏模式研究[J].混凝土与水泥制品,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.

钢筋混凝土构件疲劳设计研究

许家婧，叶浩天，殷浩天，曹慧，张邵峰

2022年第7期

摘要

引用本文

摘要：对比分析了国内外混凝土结构设计规范中关于疲劳设计的规定后发现：美国混凝土协会ACI 215R—74《疲劳荷载下混凝土结构设计规定》、日本土木工程学会JSCE 2007《混凝土结构设计规范》、我国GB 50010—2010《混凝土结构设计规范（2015年版）》均采用容许应力法进行钢筋混凝土构件疲劳设计；美国公路运输协会AASHTO LRFDUS—2017《高速公路桥梁设计规范》和欧洲CEB-FIP（2010）《混凝土结构规范》则采用疲劳极限状态设计方法，考虑荷载和抗力系数，以结构使用寿命不超过失效寿命为原则进行钢筋混凝土构件疲劳设计。在总结各国规范基础上，提出了钢筋混凝土构件的疲劳设计基本步骤，并进行了算例分析。 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.

许家婧,叶浩天,殷浩天,等.钢筋混凝土构件疲劳设计研究[J].混凝土与水泥制品,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.

再生混凝土免烧砖制备工艺研究

孙洪浩1，刘红梅1，2，郭容1，张健3，朱晨辉1

2022年第7期

摘要

引用本文

摘要：利用废弃混凝土再生细骨料及再生微粉，采用静压成型工艺制备了再生混凝土免烧砖，以抗压强度和抗折强度为优化指标，分别对制砖成型工艺与养护工艺进行了研究。结果表明：再生混凝土免烧砖的强度随着成型压力和蒸汽养护时间的增加而增加；再生混凝土免烧砖的强度随着压制速度的增加而呈现下降趋势；最佳成型压力为15 MPa、压制速度为0.6 mm/s、蒸汽养护温度为80 ℃、养护时间为16 h。在此生产条件下，再生混凝土免烧砖的28 d抗压强度为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.

孙洪浩,刘红梅,郭容,等.再生混凝土免烧砖制备工艺研究[J].混凝土与水泥制品,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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