再生混凝土梁开裂弯矩的修正计算_《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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再生混凝土梁开裂弯矩的修正计算

Correction of Cracking Moment Calculation of Recycled-aggregate Concrete Beams

2021年第7期

再生混凝土梁；骨料取代率；开裂弯矩；公式修正

Recycled-aggregate concrete beam; Aggregate substitution rate; Cracking moment; Formula revision

2021年第7期

10.19761/j.1000-4637.2021.07.038.05

湖北省重点研发计划项目（2020BAB071）；武汉工程大学第十一届研究生教育创新基金项目（CX2019051）。

陈旭勇1，张智鑫1，吴巧云1，樊建平2，赵日煦3

1.武汉工程大学土木工程与建筑学院，湖北武汉 430073；2.华中科技大学土木与水利工程学院，湖北武汉 430074；3.中建商品混凝土有限公司, 湖北武汉 430205

陈旭勇1，张智鑫1，吴巧云1，樊建平2，赵日煦3

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.

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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.

英文名 : Correction of Cracking Moment Calculation of Recycled-aggregate Concrete Beams

刊期 : 2021年第7期

关键词 : 再生混凝土梁；骨料取代率；开裂弯矩；公式修正

Key words : Recycled-aggregate concrete beam; Aggregate substitution rate; Cracking moment; Formula revision

刊期 : 2021年第7期

DOI : 10.19761/j.1000-4637.2021.07.038.05

文章编号 :

基金项目 : 湖北省重点研发计划项目（2020BAB071）；武汉工程大学第十一届研究生教育创新基金项目（CX2019051）。

作者 : 陈旭勇1，张智鑫1，吴巧云1，樊建平2，赵日煦3

单位 : 1.武汉工程大学土木工程与建筑学院，湖北武汉 430073；2.华中科技大学土木与水利工程学院，湖北武汉 430074；3.中建商品混凝土有限公司, 湖北武汉 430205

陈旭勇1，张智鑫1，吴巧云1，樊建平2，赵日煦3

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.

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摘要

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结论

参考文献

引用本文

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.

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