钢筋再生混凝土梁抗裂性能试验研究

发布时间：2018-05-20 13:54

本文选题：钢筋再生混凝土梁 + 塑性影响系数　；参考：《科学技术与工程》2016年35期

【摘要】：为了推广再生混凝土在我国土木领域的工程应用,用再生粗骨料全部替代天然粗骨料,设计制作了10根钢筋再生混凝土矩形截面试验梁(再生混凝土强度等级:RC20~RC30,配筋率:0.83%~1.29%),并对其受弯抗裂性能进行试验研究。通过试验系统地研究了钢筋再生混凝土梁的静力受荷破坏过程。结果显示,钢筋再生混凝土梁的受荷破坏过程可划分为线性工作阶段、带裂缝工作阶段和破坏阶段,破坏形态均表现为延性破坏。同时分析再生混凝土强度等级、配筋率对试验梁开裂荷载与平均裂缝间距的影响。结果表明,依据GB 50010—2010《混凝土结构规范》计算的平均裂缝间距小于试验实测值,而开裂荷载计算值明显大于试验实测值。在试验结果的基础上,提出了钢筋再生混凝土受弯梁开裂荷载及平均裂缝间距的建议计算公式。
[Abstract]:In order to popularize the engineering application of recycled concrete in civil engineering field in China, the natural coarse aggregate is replaced by recycled coarse aggregate. Ten reinforced recycled concrete rectangular section test beams (recycled concrete strength grade: RC20 / RC30) were designed and manufactured. The static loading failure process of reinforced recycled concrete beams is systematically studied through experiments. The results show that the failure process of reinforced recycled concrete beams can be divided into linear working stage, crack working stage and failure stage, and the failure form is ductile failure. At the same time, the influence of strength grade and reinforcement ratio of recycled concrete on cracking load and average crack spacing of test beam is analyzed. The results show that the average crack spacing calculated according to GB50010-2010 concrete structure Code is smaller than the measured value, while the calculated value of cracking load is obviously larger than the experimental measured value. Based on the experimental results, a formula for calculating the crack load and average crack spacing of reinforced recycled concrete flexural beams is proposed.
【作者单位】：河北工程大学土木工程学院;河北农业大学城乡建设学院;
【基金】：河北省自然科学基金(E2015204111)项目河北省科学技术研究与发展计划(15273609D)项目资助
【分类号】：TU375.1

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