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对大跨径碳纤维增强聚合CFRP缆索和钢缆索悬索桥的静力特性进行理论对比分析,从理论的角度探索CFRP缆索应用于大跨径桥梁的优点。采用有限元建模对比分析了CFRP/钢缆索悬索承载效率,说明CFRP缆索更适合用于超大跨径悬索桥,随着跨径的增大,CFRP缆索的优点就越明显;对比分析了恒荷载作用下,CFRP缆索主缆最大拉力、锚碇拉力及塔顶压力均小于钢缆索;对比分析了两种缆索悬索桥在满载工况时的效应,通过分析该工况下主缆、加劲梁的位移及主缆和吊索的内力响应,指出两者内力相差不大;对比分析了两种桥梁在升温和降温时的作用效应,指出CFRP缆索悬索桥受温度影响远小于钢缆索悬索桥。
The theoretical analysis of the static characteristics of long-span carbon fiber reinforced polymer CFRP cables and steel cable suspension bridges is carried out, and the advantages of CFRP cables applied to long-span bridges are explored theoretically. The CFRP / steel cable suspension carrying efficiency is compared and analyzed by using finite element modeling, which shows that CFRP cable is more suitable for super long span suspension bridge. With the increase of span, the advantage of CFRP cable is more obvious. Under the action, the maximum tensile force, anchorage tension and tower pressure of CFRP cable are less than that of steel cable. The effect of two kinds of cable suspension bridge under full load condition is analyzed and compared. By analyzing the displacement of main cable and stiffener in this condition, And the internal force response of the main cable and the sling, pointing out that there is not much difference between the two internal forces. The effect of the two kinds of bridges on heating and cooling is comparatively analyzed. It is pointed out that the CFRP cable suspension bridge is much less affected by temperature than the steel cable suspension bridge.