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EXPERIMENTAL STUDY ON RESTORING FORCE MODEL OF STEEL REINFORCED RECYCLED AGGREGATE CONCRETE COLUMNS
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摘要: 根据7个型钢再生混凝土长柱拟静力试验结果，通过理论分析和试验数据拟合，给出型钢再生混凝土长柱恢复力模型的特征参数的计算方法，提出定点指向三折线恢复力模型。研究结果表明：轴压比、配箍率、粗骨料取代率对构件的极限荷载与屈服荷载的比值影响较小，近似趋于定值0.8；极限荷载随着轴压比的增大而增大，延性随着粗骨料取代率和轴压比的增大而降低，随着配箍率的增大而提高；通过试验骨架曲线和计算骨架曲线的对比，二者比较吻合，能够比较全面地反映构件的实际受力性能，所提恢复力模型较为合理。Abstract: Based on the quasi-static test results of 7 steel reinforced recycled aggregate concrete (SＲＲC) columns，the method of calculation of the characteristic parameters was given and thedesignated pointbroken tri-linearrestoring force model for steel reinforced recycled aggregate concrete columns was also proposed by the theoreticalanalysis and experimental data fitting． The results show that the axial compression ratio，stirrup ratio and coarseaggregate replacement rate have little influence on the ratio of ultimate load to yield load，which approximates 0. 8．The ultimate load increases with the increase of axial compression ratio． However，the ductility decreases with theincrease of the coarse aggregate replacement rate and axial compression ratio，yet it increases as the stirrup ratioincreasing． Through the comparison between the test results and the calculated results，the restoring force model canreflect the mechanical performance of SＲＲC components and the results agree well with the test results，indicatingthat the restoring force model can be used for SＲＲC columns．
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