广西大学学报（自然科学版）
廣西大學學報（自然科學版）
엄서대학학보（자연과학판）
JOURNAL OF GUANGXI UNIVERSITY （NATURAL SCIENCE EDITION）
2015年
1期
58-65
,共8页
钢管混凝土%再生混凝土%轴心受压%承载力
鋼管混凝土%再生混凝土%軸心受壓%承載力
강관혼응토%재생혼응토%축심수압%승재력
concrete-filled steel tube%recycled concrete%axial compression%bearing capacity
为了最大化利用再生骨料，以硅粉和钢纤维掺量为主要变化参数设计了20个圆形和方形截面钢管全再生粗骨料混凝土短柱构件进行轴压试验，观察了短柱的受力全过程和破坏形态，获取了构件的荷载―变形全过程曲线，分析了硅粉和钢纤维掺量对其承载性能的影响，试验结果表明：混凝土中的粗骨料全部采用再生骨料会降低钢管再生混凝土柱的峰值承载力及峰值应变，可以采用硅粉的填充效应及活性和钢纤维对裂缝的内部约束来改善钢管全再生骨料混凝土柱的性能，经改性后的钢管全再生骨料混凝土柱的性能和普通钢管混凝土柱的性能相当，硅粉掺量为10%、钢纤维体积掺量为1.5%的钢管全再生骨料混凝土的峰值承载力超过了普通钢管混凝土柱。并采用现有计算理论及规程计算公式对构件的承载力进行了计算和比较，得到各规程在计算钢管全再生骨料混凝土承载力时的适用性，规程EC4和试验数据更接近。
為瞭最大化利用再生骨料，以硅粉和鋼纖維摻量為主要變化參數設計瞭20箇圓形和方形截麵鋼管全再生粗骨料混凝土短柱構件進行軸壓試驗，觀察瞭短柱的受力全過程和破壞形態，穫取瞭構件的荷載―變形全過程麯線，分析瞭硅粉和鋼纖維摻量對其承載性能的影響，試驗結果錶明：混凝土中的粗骨料全部採用再生骨料會降低鋼管再生混凝土柱的峰值承載力及峰值應變，可以採用硅粉的填充效應及活性和鋼纖維對裂縫的內部約束來改善鋼管全再生骨料混凝土柱的性能，經改性後的鋼管全再生骨料混凝土柱的性能和普通鋼管混凝土柱的性能相噹，硅粉摻量為10%、鋼纖維體積摻量為1.5%的鋼管全再生骨料混凝土的峰值承載力超過瞭普通鋼管混凝土柱。併採用現有計算理論及規程計算公式對構件的承載力進行瞭計算和比較，得到各規程在計算鋼管全再生骨料混凝土承載力時的適用性，規程EC4和試驗數據更接近。
위료최대화이용재생골료，이규분화강섬유참량위주요변화삼수설계료20개원형화방형절면강관전재생조골료혼응토단주구건진행축압시험，관찰료단주적수력전과정화파배형태，획취료구건적하재―변형전과정곡선，분석료규분화강섬유참량대기승재성능적영향，시험결과표명：혼응토중적조골료전부채용재생골료회강저강관재생혼응토주적봉치승재력급봉치응변，가이채용규분적전충효응급활성화강섬유대렬봉적내부약속래개선강관전재생골료혼응토주적성능，경개성후적강관전재생골료혼응토주적성능화보통강관혼응토주적성능상당，규분참량위10%、강섬유체적참량위1.5%적강관전재생골료혼응토적봉치승재력초과료보통강관혼응토주。병채용현유계산이론급규정계산공식대구건적승재력진행료계산화비교，득도각규정재계산강관전재생골료혼응토승재력시적괄용성，규정EC4화시험수거경접근。
In order to make full use of recycled aggregate, 20 specimens with circular and square cross sections were designed to be tested, and the dosage of silica powder and content of steel fiber were regarded as the major variable parameters. Through the experiment, the entire compress process and failure modes of all specimens were observed, and load-strain curves of the specimens were obtained. The test results indicate that the ultimate axial load and corresponding strain of the concrete-filled steel tube columns would decrease after the replacement of natural coarse aggregate with 100% recycled coarse aggregate. The filling effect and pozzolanic action of silica powder and the confinement effect of steel fiber could be used to improve the performance of concrete-filled steel tube columns with 100% recycled coarse aggregate, and the performance of modified columns was i- <br> dentical to that of common columns. The column with 10% cement replaced by silica powder and 1. 5%volume fraction of steel fiber has a higher ultimate axial load than that of common columns. In addition, the applicability of present theory and formula from different codes to calculate the bearing capacity of the specimens was obtained based on the comparison of calculated results. The results obtained by EC4 are more close to the experimental results.
