独塔部分地锚式PC斜拉桥经济及设计参数研究

发布时间：2018-02-20 02:13

本文关键词： 独塔部分地锚式斜拉桥设计参数总造价单位桥长造价背索自锚比例锚碇主跨长度比边主跨比塔跨比　出处：《河海大学学报(自然科学版)》2017年02期 　论文类型：期刊论文

【摘要】：为得到独塔部分地锚式PC斜拉桥的合理设计参数范围,通过对拉索、主塔、锚碇、主梁的材料用量和造价进行计算,建立了全桥总造价及单位桥长造价公式,据此开展了独塔部分地锚式PC斜拉桥合理背索自锚比例、锚碇主跨长度比、边主跨比及塔跨比的研究,并与其他斜拉桥型进行了对比。结果表明:考虑全桥跨越能力时,背索自锚比例宜取0.336~0.487范围内的大值,边主跨比宜取0.487~0.544范围内的小值,考虑单跨跨越能力时反之;当主跨跨度较小时,可取适当小于依据上原则的取值,当主跨跨度较大时反之;塔跨比宜取0.372左右,对应的主跨边索倾角为20.4°左右,跨径较小时取较大值,跨径较大时取较小值,与其他斜拉桥型无明显区别。独塔部分地锚式PC斜拉桥仅在边跨自锚段空间受地形条件限制时经济性能优于独塔常规斜拉桥,在常规地形并无优势。
[Abstract]:In order to obtain the reasonable design parameter range of PC cable-stayed bridge with single tower, the total cost of the whole bridge and the cost formula of unit bridge length are established by calculating the material quantity and cost of cable, main tower, Anchorage and main girder. Based on this, the reasonable ratio of anchor cable to anchor, the ratio of main span to length, the ratio of main span to side and the ratio of tower to span of PC cable-stayed bridge with single tower are studied and compared with those of other cable-stayed bridges. The results show that, when considering the span capacity of the whole bridge, The ratio of back cable to anchor should be large in the range of 0.336 ~ 0. 487, the ratio of main span to side should be in the range of 0. 487 ~ 0. 544, and the reverse should be taken into account when the span of single span is small, and when the span of main span is small, it is appropriate to be smaller than the value based on the above principle, and vice versa when the span of main span is large. The ratio of tower to span should be about 0.372, the angle of inclination of the main span cable should be about 20.4 掳, the span should be larger when the span is small, and the value should be smaller when the span is larger. There is no obvious difference between PC cable-stayed bridge and other cable-stayed bridges. The economic performance of single-tower partially anchored PC cable-stayed bridge is better than that of single-tower conventional cable-stayed bridge when the space of self-anchored section of side span is restricted by topographic conditions, but it has no advantage in conventional terrain.
【作者单位】：长安大学公路学院;长安大学旧桥检测与加固技术交通行业重点实验室;
【基金】：中国博士后基金(2015M572511)
【分类号】：U448.27

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