Influence of Axial Compression Ratio on Hysteretic Properties of Steel Shell-Concrete Pylon
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摘要:
为研究轴压比对钢壳−组合索塔滞回性能的影响，基于无纵筋的组合索塔构造，以轴压比为研究参数设计3个滞回试件，测试得到各试件的滞回曲线、破坏特征以及应变发展，总结试件在大偏心破坏下的力学行为；采用ABAQUS软件建立有限元模型作进一步分析，探明索塔截面发生界限破坏的条件；提出界限破坏下截面的轴压与弯矩计算公式，并探讨截面中含钢率与混凝土强度对界限破坏轴压比的影响规律. 研究结果表明：大偏心破坏下，截面的刚度、峰值承载力和耗能性能随轴压比的增大而提升，当轴压比由0.056增大至0.166时，试件的刚度与抗弯承载力提升了20%；组合索塔截面的界限破坏条件为受拉侧边缘钢壳屈服的同时受压侧边缘混凝土压溃，界限破坏下截面具有最高的抗弯承载力与刚度；提出的计算公式能较为准确地评估界限破坏下截面的轴压比与抗弯承载力，含钢率和混凝土强度的提升均将使截面界限破坏轴压比下降；组合索塔截面界限破坏轴压比位于0.44～0.56，更适用于轴压比较大的大跨度悬索桥桥塔.
Abstract:To investigate the influence of the axial compression ratio on the hysteretic properties of the steel shell-concrete composite pylon, based on the composite pylon structure without longitudinal rebars, three hysteretic specimens were designed with the axial compression ratio as the research parameter. Through testing, the hysteresis curves, failure characteristics, and strain development of each specimen were obtained, and the mechanical behavior under large eccentric failure was analyzed. A finite element model was then established using ABAQUS for further analysis, and the boundary failure conditions of the pylon section were determined. Then, calculation formulas for the axial compression and bending moment of the section under boundary failure were proposed, and the effect of the steel ratio and concrete strength on the axial compression ratio under boundary failure was discussed. The research results indicate that under large eccentric failure, the section stiffness, peak bearing capacity, and energy dissipation capacity increase with the axial compression ratio. When the axial compression ratio increases from 0.056 to 0.166, the stiffness and the flexural capacity of the specimen improve by 20%. The boundary failure condition of the composite pylon section is defined by the yielding of the tensile-side steel shell and crushing of the compressive-side concrete. Under boundary failure, the section achieves its highest flexural capacity and stiffness. The proposed calculation formulas provide an accurate assessment of the axial compression ratio and flexural capacity under boundary failure. Both an increase in steel ratio and concrete strength lead to a reduction in the axial compression ratio at boundary failure. The axial compression ratio under boundary failure in the composite pylon section falls within the range of 0.44–0.56, making it well-suited for long-span suspension bridge towers with higher axial compression ratios.
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Key words:
- cable-stayed bridge /
- composite structure /
- tower /
- axial compression ratio /
- hysteretic experiment
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图 11 钢壳在滞回荷载下的受力行为
Figure 11. Mechanical behavior of steel shell under hysteretic load
图 14 界限破坏轴压比的变化规律
Figure 14. Variation law of axial compression ratio of boundary failure
表 1 试件材性参数
Table 1. Material parameters of specimens
编号 V/kN A/m2 含钢率/% 配箍率/% n fsh/MPa fy/MPa fck/MPa SP7300 7300 1.0 3.35 2.67 0.166 500 464 44.4 SP4500 4500 0.102 SP2500 2500 0.056 注：fsh为钢壳的屈服应力，fy为钢筋的屈服应力，fck为混凝土的圆柱体强度. 
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表 2 承载力对比
Table 2. Bearing capacity comparison
试件编号 Fy/kN Fp/kN 试验 有限元 试验 有限元 SP7300 1639 1717 1927 2044 SP4500 1487 1617 1727 1849 SP2500 1321 1539 1539 1665 注：Fy为屈服荷载，Fp为峰值荷载.
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