鳌江特大桥索梁锚固区受力分析及结构优化

发布时间：2018-01-11 04:23

本文关键词：鳌江特大桥索梁锚固区受力分析及结构优化　出处：《桥梁建设》2017年02期 　论文类型：期刊论文

【摘要】：鳌江特大桥主桥为主跨320m的双塔双索面钢-混组合梁斜拉桥,斜拉索在主梁上采用钢锚箱锚固。为研究索梁锚固区的应力分布,防止应力集中,改善锚固区受力,采用ANSYS软件建立钢锚箱及其对应的主梁边箱节段锚固区的三维实体有限元模型,分析锚固区的受力特性,并分析锚固区关键板件厚度及斜拉索索面倾角调整的2步优化方法。结果表明:锚箱盖板与箱梁腹板衔接处存在较高的应力集中区,受力不利;调整锚固区关键板件厚度可有效降低锚固区的应力水平,使钢锚箱和箱梁腹板受力更均衡、合理;调整拉索索面倾角可使锚固区受力有一定改善,但效果有限,且会影响到桥塔和主梁的总体布置。该桥实际施工采取调整锚固区关键板件厚度的优化方法,改善了钢锚箱的应力集中现象,钢锚箱受力合理,满足设计要求。
[Abstract]:Concrete composite beam cable-stayed bridge Aojiang bridge main span 320m Twin Towers double cable plane steel, cable with steel anchor box anchorage in the main girder. The stress distribution of cable girder anchorage zone, prevent stress concentration, improve the anchorage zone stress, using the 3-D finite element in Anchorage Zone of box section the ANSYS software to establish the model of the main girder of steel anchor box and the corresponding edge stress analysis of anchorage zone, the 2 step optimization method and the analysis of the key parts in the anchorage zone of cable thickness and angle adjustment. The results show that there is a high stress concentration zone of anchor box cover and the box girder web connection, by the force is unfavorable; key board adjustment of anchorage zone thickness can effectively reduce the stress level of the anchorage zone, steel anchor box and the box girder stress is more balanced, reasonable adjustment; the cable angle can make the anchorage zone stress have improved, but the effect is limited, and will affect the bridge tower and girder The overall layout of the bridge is optimized by adjusting the key plate thickness of anchorage zone, which improves the stress concentration phenomenon of steel anchor box, and the force of steel anchor box is reasonable, which meets the design requirements.

【作者单位】：浙江省交通规划设计研究院;
【分类号】：U448.27
【正文快照】： 1概述甬台温高速公路复线温州瑞安至苍南段工程第3标段的鳌江特大桥位于浙江省温州市平阳县与苍南县交界处,跨越鳌江口。鳌江特大桥主桥为双塔双索面斜拉桥[1],跨径布置为(52+88+320+88+52)m,采用半飘浮体系。主桥主梁采用“双边箱+混凝土桥面板”的钢-混组合梁结构,采用门式

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