摘要
为研究PC主梁(预应力混凝土梁)的矮塔斜拉桥常用设计参数的特点,汇总了72座已建PC主梁矮塔斜拉桥(国内40座,国外32座),经统计分析得到主要分布规律。结果表明:主梁一般采用变高度梁,跨中高跨比一般分布在1/80~1/30之间,根部高跨比一般分布在1/50~1/17之间,国内、外桥的高跨比分布没有明显的差异,高跨比随着主跨跨径增加没有明显变化,不同跨径桥梁的高跨比类似;塔高和跨径之比基本分布在1/5~1/15,该值远小于斜拉桥。分析结果可以为PC主梁矮塔斜拉桥的设计提供参考依据。
In order to study the characteristics of the common design parameters for the PC(pre-stressed concrete) girder short-pylon cable-stayed bridge, this paper summarizes 72 built PC girder short-pylon cable-stayed bridges(40 bridge at home and 32 bridges abroad). The main distribution regularity is achieved after the statistical analysis. The result shows that the main girder is generally a variable height girder. The depth-span ratio in the middle of span is generally distributed in 1/80~1/30, and the depth-span ratio at the root part is generally distributed in 1/50~1/17. The distribution of depth-span ratio is not obvious different at home and abroad. The depth-span ratio is not obviously changed with the increment of the main span size.The depth-span ratios of the different-span bridges are similar. The ratio of pylon height to span is basically distributed in 1/5~1/15. This value is much less than the cable-stayed bridge. The analysis result can be referred for the design of PC girder short-pylon cable-stayed bridge.
引文
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