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目前,有关高强圆钢管混凝土压弯构件基本性能的试验及数值研究相对较少。在之前文章中,已经提出评估此类压弯构件非线性性能的数值模型,考虑约束和初始几何缺陷对核心混凝土强度和韧性及钢管的影响。验证该模型的正确性,并进行压弯构件基本性能的参数化研究。通过相应的试验结果,验证根据此模型求得的偏心荷载作用下极限承载力和轴力-变形性能的正确性。在计算机程序中应用该模型,研究高强圆钢管混凝土压弯构件的基本性能,如:荷载-位移曲线,极限承载力,轴力-弯矩曲线及由混凝土约束引起的强度增量。参数包括:构件长细比,偏心率,混凝土抗压强度,钢材屈服强度,钢材百分比,混凝土约束条件等。结果表明:提出的数值模型能有效模拟和设计高强圆钢管混凝土压弯构件。本基准数值结果对完善组合结构设计规范中有关高强混凝土压弯构件的规定很有意义。
At present, there are relatively few tests and numerical studies on the basic properties of high-strength concrete-filled CFST members. In previous articles, numerical models to evaluate the non-linear behavior of such compression-bent members have been proposed to consider the effects of constraints and initial geometric imperfections on the strength and ductility of core concrete and steel pipe. Verify the correctness of the model, and carry out parametric research on the basic performance of the compression-bending member. Through the corresponding test results, the correctness of the ultimate bearing capacity and the axial force-deformation performance under the eccentric load obtained from this model is verified. The model is applied to the computer program to study the basic properties of CFST members such as load-displacement curve, ultimate bearing capacity, axial force-bending moment curve and strength increment caused by concrete confinement. Parameters include: slenderness ratio, eccentricity, compressive strength of concrete, steel yield strength, percentage of steel, concrete constraints and so on. The results show that the proposed numerical model can effectively simulate and design high-strength concrete-filled CFST members. The numerical results of this benchmark are very meaningful to improve the rules of high-strength concrete compression-bending members in the design code of composite structures.