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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

先张法预应力混凝土竹节管桩抗弯性能试验研究
先张法预应力混凝土竹节管桩抗弯性能试验研究
  • 陈克伟
2021年第7期
摘要
引用本文
摘   要:为研究竹节管桩的抗弯性能,以两种桩型的竹节管桩为例,按桩身外径计算得到了其开裂弯矩和极限弯矩,并进行了竹节管桩试件的开裂弯矩、极限弯矩、破坏特征及裂缝分布等抗弯性能试验研究,对比分析了计算值和试验值。结果表明:竹节管桩采用桩身直径计算抗弯性能较合理,试验值与理论计算值相比,极限弯矩的富余较大;竹节管桩的破坏形式为受拉区预应力钢筋首先发生屈服,然后受拉区预应力钢筋被拉断,最后受压区混凝土被压碎;竹节管桩跨中截面应变分布基本符合平截面假定,竖向裂缝出现后截面中性轴上移,受压区混凝土应变稳定增长。 Abstract: In order to study the flexural performance of the pretensioned spun nodular concrete pile, the theoretical cracking moment and ultimate bending moment of two types of piles were obtained with reference to the outer diameter of the pilet, and the experimental research on the flexural performance such as cracking moment, ultimate moment, failure characteristics and crack distribution were carried out. The results show that it is reasonable to use the diameter of the pile body to calculate the flexural performance of nodular concrete pile, and the surplus of the ultimate bending moment between the experimental value and the theoretical value is larger. The failure characteristics of nodular concrete pile are as follows: the prestressed reinforcement in tension zone yields first, the prestressed reinforcement in tension zone is broken, and finally the concrete in compression zone is crushed. The results conforms to the assumption of plane section. After the occurrence of vertical cracks, the neutral axis of the section moves up, and the strain of the concrete in the compression zone increases steadily.
陈克伟.先张法预应力混凝土竹节管桩抗弯性能试验研究[J].混凝土与水泥制品,2021(7):33-37. CHEN K W.Flexural Performance Experiment of Pretensioned Spun Nodular Concrete Piles[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(7):33-37.
再生混凝土梁开裂弯矩的修正计算
再生混凝土梁开裂弯矩的修正计算
  • 陈旭勇1,张智鑫1,吴巧云1,樊建平2,赵日煦3
2021年第7期
摘要
引用本文
摘   要:为研究再生混凝土梁的抗裂性,对不同骨料类型(Ⅰ类再生骨料和Ⅱ类再生骨料)及不同再生骨料取代率(50%、70%和100%)的再生混凝土梁进行了数值仿真模拟,并将开裂弯矩的数值模拟结果与规范计算值进行了对比分析。结果表明:与天然混凝土梁相比,再生混凝土梁的开裂弯矩偏小,其中Ⅱ类再生混凝土梁的开裂弯矩降幅最大,说明现行GB 50010—2010《混凝土结构设计规范》中的开裂弯矩计算方法用于再生混凝土梁的开裂弯矩计算误差较大。此外,在考虑再生骨料类型及骨料取代率对开裂弯矩影响的基础上,提出了再生混凝土梁开裂弯矩的修正公式,通过该修正公式计算所得的开裂弯矩值与试验值吻合较好,证明该公式适用于再生混凝土梁的开裂弯矩计算。 Abstract: In order to study the crack resistance of recycled-aggregate concrete beams, based on experimental test data, numerical simulation of beams of varied aggregate types (Type Ⅰ recycled aggregates and Type Ⅱ recycled aggregates) and varied aggregate substitution rates (50%, 70% and 100%) was performed, and the simulation result was futher compared with the values calculated by the design code. The results show that: the cracking moment of recycled-aggregate concrete beams is smaller than that of natural concrete beams, where the cracking moment of Type Ⅱ recycled-aggregate concrete beams decreases most significantly. This implies that the current highway bridge code cannot be directly applied to the cracking moment calculation of recycled-aggregate concrete beams. Moreover, the corrected formulas for cracking moment calculation of recycled-aggregate concrete beams are proposed, which take into account the influence of aggregate type and aggregate substitution rate on cracking moment. The values calculated by the corrected formulas agree with the values from experimental testing very well, which therefore validates that the proposed formulas are more suitable for the cracking moment calculation of recycled-aggregate concrete beams.
陈旭勇,张智鑫,吴巧云,等.再生混凝土梁开裂弯矩的修正计算[J].混凝土与水泥制品,2021(7):38-42. CHEN X Y,ZHANG Z X,WU Q Y,et al.Correction of Cracking Moment Calculation of Recycled-aggregate Concrete Beams[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(7):38-42.
生态型混凝土人工鱼礁研究进展
生态型混凝土人工鱼礁研究进展
  • 姜传胜1,梅敬松2,刘志勇2
2021年第7期
摘要
引用本文
摘   要:分析了混凝土人工鱼礁的国内外研究及应用进展,提出了以透水混凝土和植生混凝土为基础的新型生态鱼礁混凝土方案,制备了具有较高孔隙率和特定表面性质的生态型鱼礁混凝土,可为海洋生物附着生长提供有利环境。通过将自主研发的增韧水性环氧涂层钢筋应用到人工鱼礁骨架上,有效缓解了钢筋由于氯离子侵蚀而产生的锈蚀问题,从而大大提高了鱼礁结构的安全性和耐久性。此外,在礁型设计方面,采用混凝土管状堆积模型,辅以离心成型工艺进行设计。 Abstract: The research and application progress of concrete artificial reef at home and abroad are analyzed, and a new design scheme of concrete for ecological reef based on permeable concrete and vegetation concrete is put forward. The ecological reef concrete with higher porosity and specific surface properties is prepared, which provides a favorable environment for the attachment and growth of marine organisms. At the same time, the self-developed toughened epoxy-coated steel bar is applied to the artificial reef structure, which can effectively overcome the problem of severe corrosion of the steel bar caused by the corrosion of chloride ions, so as to greatly improve the durability and safety of the structure. In addition, a concrete tubular accumulation model is proposed, supplemented by a suitable molding process to construct a new ecological concrete artificial reef.
姜传胜,梅敬松,刘志勇.生态型混凝土人工鱼礁研究进展[J].混凝土与水泥制品,2021(7):43-46. JIANG C S,MEI J S,LIU Z Y.Research Progress of Ecological Concrete Artificial Reef[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(7):43-46.
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