为研究GFRP套管钢筋混凝土短柱的轴压力学性能,进行了22个GFRP套管钢筋混凝土短柱和6个无GFRP套管约束的钢筋混凝土短柱对比试验。研究了影响GFRP套管钢筋混凝土组合短柱轴压力学性能的主要因素,包括GFRP套管不同的受力方式、混凝土强度、纵筋配筋率等。试验结果表明:由于GFRP套管的约束,提高了核心混凝土的强度,增大了核心混凝土的变形能力;GFRP套管在不同的受力方式下,组合短柱的轴压承载力和变形基本相同;GFRP套管内配置纵筋可提高GFRP套管混凝土短柱的轴压承载力,适当提高纵筋配筋率可改善短柱的延性。根据试验结果及现有FRP管约束混凝土轴心抗压强度计算公式,建议了GFRP套管钢筋混凝土短柱承载力计算公式,计算结果与试验结果基本吻合。

Twenty-two GFRP tubed short reinforced concrete columns and six columns without GFRP tube confined were tested under axial load to investigate mechanical properties of axially loaded GFRP tubed short reinforced concrete columns. The principal influencing factors such as loading condition, concrete strength and ratio of longitudinal reinforcement were studied. Test results indicate that strength and deformation performance of core concrete are increased as a result of the confinement of GFRP tube. Load-carrying capacity and deformation of short composite columns with different loading condition are much the same. Load-carrying capacity and ductility of GFRP tubed short columns are improved because of the longitudinal reinforcement in GFRP tube. According to the experimental results together with the existing strength equation of FRP tube confined concrete, the calculation formula ultimate load-carrying capacity for the short composite columns are proposed. The results calculated by the

在工程设计时，应尽可能避免短柱。当无法避免时，应采取有效措施，防止短柱剪切或剪切斜拉破坏。《建筑抗震设计规范》（GB50011-2010）：11对框架柱有明确的延性要求。轴压比和剪跨比是影响柱延性主要的两个因素，本文着重探讨了设计遇到短柱时，宜采取哪些措施。

In the engineering design, builders should avoid short column as far as possible. And when not, effective me- asures should be taken to prevent the shear of short columns or shear diagonal tension failure. “Earthquake Resistant Design Code”(GB50 011-2010) :11 has clear requirement of ductility of frame column. The axial compression ratio and shear span ratio are the two major factors influencing ductility of column. This paper disc- ussed which measures to take to deal with a short column in design.

为了研究BFRP布用量对混凝土短柱轴心抗压性能的影响,进行了单向轴心抗压试验和数值模拟研究。研究结果表明,随着BFRP布用量的增加,混凝土短柱的轴心抗压强度均有不同程度提高;采用ANSYS有限元分析软件能较好地模拟BFRP布约束混凝土短柱的轴心抗压强度。

In order to study the affection of the amount of BFRP sheets on the axial compressive strength of confined concrete short column, the uniaxial compressive test and numerical simulation are carried out. The results indicate that with increasing of the amount of BFRP sheets, the axial compressive strength of confined concrete short columns increase in different degree. And the axial compressive strength of confined concrete short column can be well simulated by using ANSYS finite element analysis software.

利用有限元软件ABAQUS对方钢管再生混凝土短柱轴压承载力进行非线性分析,建立了适用于有限元分析的钢管和再生混凝土本构关系模型;利用极限平衡法推导方钢管再生混凝土短柱轴压承载力计算公式函数类型;利用计算结果拟合出方钢管再生混凝土短柱轴压承载力的计算公式。研究结果表明:所提出的材料本构关系模型可以较好地满足对方钢管再生混凝土短柱轴压承载力进行模拟分析的要求,通过模拟获得的计算结果与相关试验结果差异较小,所建立的方钢管再生混凝土短柱轴压承载力计算公式能够较准确地计算构件极限承载力。

Nonlinear analysis of bearing capacity for recycled concrete‐filled square steel tubular stub columns under axial compression was carried out using finite element software ABAQUS . The authors put forward the modified model of the constitutive relationship of steel and recycled concrete ,and deduced the function relation of ultimate bearing capacity formula of concrete‐filled square steel tubular stub columns under axial compression by using ultimate equilibrium method . The finite element calculation results were used to fit the ultimate bearing capacity formulae of recycled concrete‐filled square steel tubular stub columns . The study results indicate that the modified formulae of recycled concrete constitutive relationship can meet the requirements of regeneration stub columns under axial bearing capacity well .There are small differences between finite element calculation results and related test results .The established calculation formulae of bearing capacity for rec

为了研究火灾高温后圆钢管再生混凝土轴压短柱的受力性能及极限承载力，以再生粗骨料取代率、恒温温度和恒温时间为变化参数，对20个设计的圆钢管再生混凝土短柱试件进行火灾高温后的力学性能试验。并对各变化参数对圆钢管再生混凝土短柱极限承载力的影响进行分析。利用统一强度理论和叠加计算理论分别计算高温后其极限承载力，并与试验实测结果比较。研究结果表明：高温后钢管再生混凝土短柱的受力破坏过程和形态与普通钢管混凝土柱相似；火灾温度对承载力影响显著；同一温度下，承载力随恒温时间的延长呈先上升后下降的趋势；骨料取代率对试件的承载力影响不大；采用统一强度理论中钟善桐计算法对高温后圆钢管再生混凝土短柱的极限承载力进行计算，计算值与试验值吻合较好。

To study the mechanical behavior and ultimate bearing capacity of recycled aggregate concrete-filled circle steel tube short columns under axial compression after high temperature,20 recycled aggregate concrete-filled circular steel tubular short columns specimens were designed and tested, and three varying parameters were considered in the test, which were recycled coarse aggregate replacement percentage, constant temperature and constant temperature time.The influences of different parameters on ultimate bearing capacity of specimens were analyzed .Unified strengthen theory and superposition calculation theory were used to calculate the ultimate bearing capacity of specimens, whose results were compared with the test results.The results of study showed that the failure process and form of recycled aggregate concrete-filled circular steel tubular columns under axial compression after high temperature were similar to ordinary concrete-filled steel tube columns.Constant temper