长细比对内置工字形CFRP型材的圆钢管混凝土构件力学性能影响  

The Analysis of Slenderness Effect on Mechanical Performance of Concrete-Filled Circle Steel Tube Column with Inner I-Shaped CFRP Profile

作　　者：李帼昌[1] 王友东 LI Guochang;WANG Youdong(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第5期769-777,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51938009)。

摘　　要：目的 研究长细比对内置工字形CFPR型材高强圆钢管高强混凝土轴压构件力学性能的影响,为该类型柱设工程计提供依据。方法 采用ABAQUS有限元软件对组合柱进行有限元模拟,分析不同长细比下钢材强度、混凝土强度等参数对组合柱力学性能的影响。结果 组合柱发生弹性和弹塑性失稳破坏的界限长细比为66.67,经验证理论公式的预测值与模拟值平均误差为3.01%。对于弹性失稳破坏的构件,与钢材强度相比,混凝土强度对构件的极限承载能力影响较大,且钢材屈服强度对钢管内力分配占比的影响较小。在组合构件中,高强混凝土所承担的荷载比例最低可达到普通强度混凝土所承担荷载的1.2倍。结论 发生弹性失稳破坏的构件可以通过提高混凝土强度达到提高构件承载力的目的;与普通强度混凝土相比,在组合柱中采用高强混凝土和高强钢管,可以使组合柱具有更好的组合效应;工字形CFRP对于组合柱极限承载力的提升主要体现在发生弹塑性失稳破坏的构件。The effect of slenderness ratio on the mechanical properties of high-strength circle steel tube high-strength concrete axial compression members with inner I-shaped CFPR profiles was studied,which provided a basis for the design of this type of column.Methods The finite element simulation of the composite column was carried out by using ABAQUS finite element software,and the influence of steel strength,concrete strength and other parameters on the mechanical properties of the composite column under different slenderness ratios was analyzed.Results The slenderness ratio of the limit of elastic and elastoplastic instability failure of the composite column is 66.67,and the average error between the predicted value and the simulated value of the verified theoretical formula is 3.01%.Compared with the steel strength,the concrete strength has a greater impact on the ultimate bearing capacity of the components,and the steel yield strength has less influence on the proportion of the internal force distribution of the steel pipe.In the composite components,the load proportion borne by high-strength concrete can reach at least 1.2 times that of ordinary strength concrete.Conclusion The purpose of improving the bearing capacity of components with elastic instability failure can be achieved by increasing the concrete strength.Compared with ordinary strength concrete,the use of high-strength concrete and high-strength steel pipe in the composite column can make the composite column have a better combination effect.The improvement of the ultimate bearing capacity of the I-shaped CFRP for the composite column is mainly reflected in the components with elastic-plastic instability failure.

关 键 词：CFRP型材 高强圆钢管高强混凝土柱 界限长细比 弹性失稳破坏 弹塑性失稳破坏 

分 类 号：TU398.9[建筑科学—结构工程]