摘要
采用大宗工业固废——自燃煤矸石破碎得到的骨料配制煤矸石混凝土,可一定程度上缓解工程建设对天然砂石的需求。为研究自燃煤矸石粗、细骨料掺量对钢筋混凝土梁受弯性能的影响,设计了3组(每组3个)混凝土抗压强度相同的受弯钢筋混凝土梁试件,包括单掺100%煤矸石细骨料,双掺100%煤矸石粗、细骨料以及钢筋普通混凝土对比试件,通过静力试验得到试件的破坏模式、荷载-位移曲线、荷载-应变曲线等;基于前期试验结果提出自燃煤矸石混凝土的材料性能预测公式,采用ABAQUS软件建立钢筋煤矸石混凝土梁受弯构件有限元模型,利用现有试验数据验证有限元模型的可靠性,并通过足尺模型参数分析进一步量化煤矸石粗、细骨料取代率对钢筋混凝土梁受弯性能的影响。结果表明:采用自燃煤矸石骨料对钢筋混凝土梁受弯承载力的影响较小,相比普通混凝土梁,单掺100%自燃煤矸石细骨料时,开裂弯矩与极限弯矩分别提高5.44%和2.00%,双掺100%煤矸石粗、细骨料时,开裂弯矩与极限弯矩分别降低3.91%和5.91%;自燃煤矸石骨料的掺入对正常使用阶段的抗弯刚度影响明显,采用单掺100%自燃煤矸石细骨料及双掺100%煤矸石骨料时构件抗弯刚度分别降低4.1%和28.1%。煤矸石粗、细骨料对钢筋煤矸石混凝土梁受弯性能的影响是耦合的,与钢筋普通混凝土梁相比,采用单掺50%粗骨料取代率、单掺100%细骨料取代率或者双掺50%粗、细骨料取代率时,钢筋煤矸石混凝土梁的受弯性能指标降低幅度均在10%以内。
Spontaneous-combustion coal gangue is known as a typical kind of industry waste, and using it to produce aggregate for new concrete production could mitigate the need of natural resources. To investigate the influence of spontaneous-combustion coal gangue aggregate(SCGA) replacement ratio on the flexural behavior of reinforced concrete beams, three groups(three identical specimens in each group) of beam specimens were designed with identical compressive strength grades including specimens with 100% fine SCGA concrete, specimens with 100% coarse & fine SCGA concrete, and specimens with ordinary concrete. Their failure modes, moment-deflection curves and moment-strain curves were recorded. Based on previous studies, the equations to predict the material properties of SCGA concrete were proposed, and the finite element(FE) models of reinforced concrete beams were established using ABAQUS and benchmarked against available test data. Using the verified models, the paper quantified the influence of coarse and fine SCGA replacement ratios on the flexural behavior of reinforced concrete beams. The obtained test results show that the bending moment capacity is slightly influenced by the mixture of SCGA;compared with reference RC beam, the cracking capacity and ultimate capacity have 5.44% and 2.00% increment, respectively for specimens with 100% fine SCGA, and 3.91% and 5.91% decrement, respectively for specimens with 100% fine & coarse SCGA. Significant reductions are observed in flexural stiffness, by 4.1% and 28.1% for specimens with 100% fine SCGA and specimens with 100% fine & coarse SCGA, respectively. The FE results show that the influences of coarse and fine SCGA on the flexural behavior are coupled. Compared with reinforced concrete beams, the compressive strength,is reduced within 10% for the mixture of 50% coarse SCGA, or the mixture of 100% fine SCGA, or the mixture of 50% fine SCGA and 50% coarse SCGA.
作者
王庆贺
李喆
周梅
张玉琢
WANG Qinghe;LI Zhe;ZHOU Mei;ZHANG Yuzhuo(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China;Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education,Harbin Institute of Technology,Harbin 150090,China;College of Civil Engineering,Liaoning Technical University,Fuxin 123000,China;Liaoning Key Laboratory of Coal Gangue Resources Utilization and Energy-saving Building Materials,Liaoning Technical University,Fuxin 123000,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2020年第12期64-74,共11页
Journal of Building Structures
基金
国家自然科学基金项目(51808351,51808352)
辽宁省重点研发计划项目(2018230008)
辽宁省博士科研启动项目(2019-BS-193)
关键词
自燃煤矸石
钢筋混凝土梁
静力试验
有限元分析
受弯性能
spontaneous-combustion coal gangue
reinforced concrete beam
static test
FEA
flexural behavior
作者简介
王庆贺,出生于1987年,男,工学博士,副教授,主要从事钢-混凝土组合结构研究。email:wangqinghe@sjzu.edu.cn;通信作者:张玉琢,出生于1988年,男,工学博士,副教授,主要从事煤矸石混凝土构件力学性能研究。email:zhangyuzhuo@sjzu.edu.cn
