高强混凝土柱在双向偏心荷载下的破坏模式与延性分析 -土木工程专业

摘要

高强混凝土因其优异的力学性能在现代建筑结构中得到广泛应用，但其在双向偏心荷载作用下的破坏模式与延性特性尚需深入研究为解决这一问题，本文通过设计一系列高强混凝土柱试件，采用数值模拟与试验研究相结合的方法，系统分析了不同偏心率、轴压比及配筋率等因素对结构性能的影响结果表明，随着双向偏心荷载的增加，高强混凝土柱呈现出从弯曲破坏到剪切破坏的过渡特征，并且轴压比的提高显著降低了构件的延性此外，通过引入改进的延性系数计算方法，发现配筋率的合理优化能够有效提升结构的延性性能基于此，本文提出了适用于高强混凝土柱的破坏模式判别准则和延性评估模型，该模型综合考虑了材料非线性、几何形状及约束效应等多方面因素，具有较高的预测精度本研究不仅揭示了高强混凝土柱在复杂受力条件下的破坏机理，还为工程设计提供了理论依据，对于推动高强混凝土结构的应用具有重要意义

关键词：高强混凝土；双向偏心荷载；延性性能；破坏模式；数值模拟

ABSTRACT

High-strength concrete has been widely used in modern building structures due to its excellent mechanical properties; however, its failure modes and ductility characteristics under biaxial eccentric loading require further investigation. To address this issue, this study designed a series of high-strength concrete column specimens and adopted a combined approach of numerical simulation and experimental research to systematically analyze the effects of different eccentricity ratios, axial compression ratios, and reinforcement ratios on structural performance. The results indicate that as biaxial eccentric loading increases, high-strength concrete columns exhibit a transition characteristic from bending failure to shear failure, and an increase in the axial compression ratio significantly reduces the ductility of the members. Furthermore, by introducing an improved method for calculating the ductility coefficient, it was found that reasonable optimization of the reinforcement ratio can effectively enhance the ductility performance of the structure. Based on these findings, this study proposes a failure mode identification criterion and a ductility evaluation model specifically applicable to high-strength concrete columns. This model comprehensively considers multiple factors, including material nonlinearity, geometric shape, and confinement effects, achieving high predictive accuracy. This research not only reveals the failure mechanisms of high-strength concrete columns under complex loading conditions but also provides theoretical support for engineering design, playing a significant role in promoting the application of high-strength concrete structures.

Keywords: High Strength Concrete; Bidirectional Eccentric Load; Ductility Performance; Failure Mode; Numerical Simulation

摘要 I

ABSTRACT II

第1章绪论 1

1.1 高强混凝土柱双向偏心荷载研究背景与意义 1

1.2 国内外研究现状综述 1

1.3 本文研究方法与技术路线 2

第2章双向偏心荷载下高强混凝土柱的受力机理 3

2.1 双向偏心荷载作用下的应力分布特征 3

2.2 材料性能对受力行为的影响分析 3

2.3 数值模拟与理论模型对比研究 4

第3章高强混凝土柱的破坏模式分析 5