钢管轻集料混凝土偏心受压构件承载力分析

Bearing capacity analysis of lightweight aggregate concrete filled steel tube columns under eccentric compression

为研究钢管轻集料混凝土构件偏心受压状态下的承载力计算方法,基于长径比为12,28和56等共54根不同偏心率的钢管轻集料混凝土偏心受压柱的承载力试验结果,分析各参数对钢管轻集料混凝土承载力的影响规律。应用多种规范对试验构件的承载力进行计算,并将计算结果与试验结果进行对比分析。针对试验结果,分析压弯构件的FN/FNu-FM/FMu相关性曲线。研究结果表明:偏心率越大、长径比越大、含钢率越小,钢管轻集料混凝土的极限承载力越低;极限承载力的规范计算结果均小于试验值,且由国外规范所得的计算结果小于由国内规范所得计算结果,现有规范对钢管轻集料混凝土的适用性有待进一步研究;小偏心率压弯构件的FN/FNu-FM/FMu相关性曲线可简化为直线。

The performance characteristics of lightweight aggregate concrete filled steel tube（LACFST） columns under eccentric compression were analyzed using the test results of 54 specimens with different eccentricity ratios,whose slenderness ratios were 12,28 and 56.The impact of different influencing factors and FN/FNu-FM/FMu correlation curves of test specimens were studied.Bearing capacity of specimens was calculated using six different codes at home and abroad,and the results were compared to the test ones.The results show that the bearing capacity of LACFST is reduced with the increase of eccentricity,slenderness ratio and the decrement of steel ratio.The calculation results of bearing capacity from the codes are lower than the test results,but the Chinese ones are more conservative,compared with those abroad.The applicability of these codes to LACFST needs to be studied more.For small eccentricities,FN/FNu-FM/FMu correlation curves can be simplified as straight-line.