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中文摘要：
在统计国内外部分已建成的自锚式悬索桥材料用量的基础上,基于银川滨河黄河大桥,研究三塔自锚式悬索桥的经济性能,建立各构件材料用量与结构参数、受力的关系,并以此为基础分析加劲梁材料、矢跨比和边中跨比等参数对造价的影响。研究得出：改变加劲梁的材料,对三塔自锚式悬索桥造价的影响较大;矢跨比的增加可以大幅减少主缆的造价;当桥梁总长一定时,边中跨比合理的范围内应选取较大值。
英文摘要：
Taking a three- tower self- anchored suspension bridge as the research object,based on the data of Three- tower Self- anchored Suspension Bridges built at home and abroad,the Economic performance of the Three- tower Self- anchored Suspension Bridge is studied,the conception of materials consumption with structural parameters and mechanical property is established. And the effects of the material of girder,rise- span ratio,side to center span ratio for the total cost are studied.Come to the conclusion that changing the material of girder has much impact on the cost of three-tower self- anchored suspension bridge;Increasing the rise- span ratio can reduce the cost of main cable significantly;The side to center span ratio should be the largest value in the reasonable scope when the total length of a bridge has been defined.
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