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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3 500 m CFRP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3 500 m CFRP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3 500 m CFRP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3 500 m CFRP主缆悬索桥原型设计。
By means of nonlinear numerical calculation, comparative analysis of structural systems such as cable system, stiffening girder, bridge tower and supporting system shows that the main span suspension bridge with 3 500 m CFRP main cable is technically feasible. Using the finite element simulation analysis method, the sensitivity of the structural system of 3 500 m CFRP main cable suspension bridge is analyzed, and the influence of structural parameters on the static and dynamic performance of the super long-span suspension bridge is studied. Combined with the numerical analysis of the structural system, The optimal structural system of main span suspension bridge with 3 500 m CFRP main cable. The physical model is established and the theoretical analysis, static load and fatigue test of anchorage, slippage and bending of the main cable strand of CFRP are carried out. Developed bonded anchors for real bridges, with an anchorage efficiency factor of 100%. The anti-slippage and bending properties were verified. The friction coefficient at the saddle was about 0.5, reaching 0.331 at the cable clamp, the bending strength at the saddle exceeded 90% of its tensile strength, and there was almost no bending at the cable clamp Break the problem. Based on the research results, prototype design of suspension bridge with main span of 3 500 m CFRP main cable was carried out.