自适应锚碇悬索桥经济性能研究

Study on Economic Performance of Adaptive Anchored Suspension Bridge

摘要:

自适应锚碇悬索桥作为一种创新性的悬索桥体系，具有可以主动调节锚碇与主梁内力分配的“自适应”特点。为研究自适应锚碇悬索桥的经济性能，建立了简化的自适应锚碇悬索桥造价模型，分别推导了主缆、主梁、吊杆、桥塔、锚碇、基础6个主要部分的材料用量和造价计算公式。对自适应锚碇悬索桥的经济性能分析结果表明：跨径在300 m以下时，该桥型与自锚式悬索桥经济性能相当，建议锚碇承担主缆水平力比例在20%以内；跨径在300~800 m时，锚碇承担主缆水平力80%的自适应锚碇悬索桥具有明显的经济优势，可节省造价20%。

Abstract:

The adaptive anchored suspension bridge is an innovative suspension bridge, and has the "adaptive" feature that can actively adjust the internal force distribution between the anchorage and the girder. In order to study the economic performance of the adaptive anchored suspension bridge, a simplified cost model of adaptive anchored suspension bridge is established to deduce the computational formulas of material consumption and cost for six main parts of main cable, girder, suspender, bridge pylon, anchorages and foundation, respectively. The results of the economic performance analysis on the adaptive anchored suspension bridge indicate that the economic performance of this bridge type is equivalent to that of the self-anchored suspension bridge when the span is below 300 m. It is recommended that the proportion of the horizontal force borne by the anchor to the main cable be within 20%. When the span is between 300 m and 800 m, the adaptive anchored suspension bridge which the anchorages bear 80% of the horizontal force caused by main cables has an obvious economic advantage, and the cost can be saved by 20%.