摘要
目的研究圆钢管再生混凝土柱力学性能的影响因素,推算出适用于此类组合柱的承载力计算公式.方法利用正交试验变化含钢率、取代率和长细比等参数变量对柱的荷载-应变、荷载-挠度等关系曲线进行分析.结果试验结果表明:组合柱弹塑性失稳破坏破坏特征显著,承载力影响因素的敏感程度依次为长细比、含钢率和取代率,其均值分别为196、147、113;当长细比为50、含钢率为11%、取代率为30%时,承载力最大为1 351 kN;模拟结果表明:组合柱中部应力最大,破坏程度最大.结论根据国内外的承载力规程进行计算,对比得出中国CECS28—2012规程最适合此类结构,推算出适应于此组合柱的承载力计算公式:N=(-0.016 8λ+1.809 3)(f_yA_s+K_1f_cA_c).
In order to study the sensitive factors to the mechanical properties of recycled concrete filled circular steel tubular columns and deduce the bearing capacity formula suitable for such composite columns,the load-strain and load-deflection curves of the columns are analyzed by orthogonal test with the parameters of steel content,substitution rate and slenderness ratio,and then simulated by finite element method.The test results show that the elastic-plastic failure characteristics of composite columns are remarkable,and the sensitivity of bearing capacity factors is slenderness ratio,steel content and substitution ratio in turn.The average values are 196,147 and 113,respectively.When slenderness ratio is 50,steel content is 11% and substitution ratio is 30%,the maximum bearing capacity is 1 351 kN.The simulation results show that the stress in the middle of the composite column is the largest and the damage degree is the greatest.According to the domestic and foreign rules of bearing capacity,it is concluded that the regulations of CECS28—2012 in China is most suitable for this kind of structure,Finally,obtains the calculating formula of bearing capacity from this composite column: N=(-0.016 8λ+1.809 3)(f_yA_s+K_1f_cA_c).
引文
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