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超大跨碳纤维增强塑料(CFRP)主缆悬索桥研究与原型设计

, PP. 60-68

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Abstract:

以非线性数值计算为手段,对比分析缆索系统、加劲梁、桥塔及支承系统等结构系统,研究表明主跨3500mCFRP主缆悬索桥具有技术可行性。利用精细有限元结构仿真分析手段,对主跨3500mCFRP主缆悬索桥结构体系进行参数敏感性分析,研究结构参数对超大跨径悬索桥静、动力性能影响,结合结构系统数值模型分析研究,确定了主跨3500mCFRP主缆悬索桥最优结构体系。建立物理模型,进行CFRP主缆索股的锚固、滑移、弯折等理论分析及静载、疲劳试验研究。研发了可用于实桥的黏结性锚具,锚固效率系数达100%。验证了抗滑移、弯折性能,在鞍座处摩擦系数约0.5,在索夹处达0.331,在鞍座处的弯曲强度超过其抗拉强度的90%,在索夹处几乎不存在弯折问题。以研究成果为依据,进行了主跨3500mCFRP主缆悬索桥原型设计。

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