Experimental investigation and research on calculation method of load-carrying capacity for eccentrically compressed RC columns strengthened by high performance ferrocement laminates under twice loading
Experimental investigation and research on calculation method of load-carrying capacity for eccentrically compressed RC columns strengthened by high performance ferrocement laminates under twice loading
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发表时间：
2011
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通讯作者：
Liu Longhai
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作者：
Liu Longhai
建立了二次加载加固柱的试验装置，对4根采用高性能钢丝网水泥布加固的近似足尺偏心柱进行了二次加载试验，并与未加固柱和相同试验参数的一次加载加固柱的试验结果进行了对比分析，研究了应力水平系数β对加固效果的影响研究了二次加载加固前的实际轴力与理论极限轴力之比β对加固柱的承载力、延性、刚度、开裂形态的影响，分析了试验过程中试验柱的徐变影响，结果表明：β越小，在β≤ 0.7时，二次加载加固柱的延性改善效果比一次加载加固柱明显，而刚度改善效果不明显。推导了承载力计算公式，该公式既明确地反映了HPFL加固导管架的工作机理，又具体地反映了加固导管架的应变滞后问题，计算值与试验值吻合较好，提出的相应加固施工措施，可保证加固导管架的安全可靠运行。加强导管架的有效功能。
This research developed the test setup for the twice-loading for columns strengthening.With which four approximately full-size eccentric columns strengthened by high performance ferrocement laminates(HPFL) under twice loading were tested.The test results were compared and analyzed with the columns without strengthening as well as one-time-loading strengthened ones with the same test parameters.The influences of the stress level factor β(the ratio of the actual axial load and theoretical ultimate axial load of the column before strengthening)before twice-loading strengthening on the load-bearing capacity,ductility,stiffness,cracking mode of the strengthened columns were researched,the creeping influence of the test columns during test process was analyzed.The results show that the smaller β is,the higher the increase of load-bearing capacity is.When β≤0.7,the ductility improvement effect of twice-loading strengthening columns is more obvious than that of one-time-loading strengthening columns,while the stiffness improvement effect isn't distinct.Based on the experimental investigation and theoretical analysis,the formulas were concluded for calculating the load-bearing capacity,which explicitly reflected the work mechanism of the HPFL strengthening jacket and also concretely reflected the problem of strain lag of strengthening jacket from the column.The calculated values by the formulas agreed well with the test values.The corresponding strengthening construction measures proposed can ensure the effective function of strengthening jacket.