基于节段模型风洞试验的莫桑比克马普托大桥主梁选型研究

发布时间：2018-01-15 16:06

本文关键词：基于节段模型风洞试验的莫桑比克马普托大桥主梁选型研究　出处：《世界桥梁》2014年02期 　论文类型：期刊论文

【摘要】：为合理确定主跨680m的莫桑比克马普托大桥的主梁形式,利用节段模型风洞试验,分别研究了扁平钢箱梁、钢箱叠合梁和工字型叠合梁的气动性能。结果表明:扭转刚度较弱的工字型叠合梁颤振风速远低于检验风速,且涡激振动也不满足舒适性要求,在设计中不宜采用;钢箱叠合梁尽管颤振风速较高,但其在钢箱顶面凸起的混凝土桥面板会造成气流分离和漩涡脱落,可能存在较大涡激振动振幅的隐患,可在设计中选择性采用;扁平钢箱梁断面颤振临界风速高,且无明显涡激振动,为该大跨度悬索桥的优选主梁形式。试验结果还显示,若设置宽0.5m的风嘴导流板可进一步提高钢箱梁断面的颤振临界风速,但由于导流板直接影响造价并增加后期养护费用,而节段模型试验结果一般偏于保守,因此最后的取舍需要参考三维颤振计算或全桥气弹模型风洞试验结果。若在其斜腹板上外挂直径90cm的过桥水管,将显著弱化颤振性能和涡振性能,因此在设计中不宜采用。
[Abstract]:In order to reasonably determine the main girder form of Mozambique Maputo Bridge with a main span of 680m, the flat steel box girder was studied by using the segmental model wind tunnel test. The results show that the flutter velocity of I-shaped composite beam with weak torsional stiffness is much lower than that of test wind speed, and the vortex-induced vibration does not meet the requirement of comfort. Should not be used in the design; Although the flutter velocity of steel box composite beam is high, the concrete bridge slab raised on the top surface of steel box will cause the separation of air flow and vortex falling off, which may have the hidden trouble of large amplitude of vortex-induced vibration, which can be selectively used in design. The flutter critical velocity of flat steel box girder section is high and there is no obvious vortex-induced vibration, so it is the best choice of the main beam form of the long-span suspension bridge. The test results also show that. The critical flutter velocity of the steel box girder section can be further improved if the flow guide plate with a width of 0.5 m is installed, but the cost is directly affected by the diversion plate and the later maintenance cost is increased. However, the results of segmental model tests are generally conservative, so the final choice needs to refer to the results of 3-D flutter calculation or wind tunnel test of full bridge Aeroelastic model. If a bridge pipe with a diameter of 90cm is attached to the inclined web. The flutter performance and vortex vibration performance will be significantly weakened, so it is not suitable to use in the design.
【作者单位】：中国路桥工程有限责任公司;西南交通大学土木工程学院;
【分类号】：U442.5
【正文快照】： 1引言从二十世纪伊始至今,大跨度悬索桥获得了广泛的应用,随着跨度不断增加,其抗风性能也得到了越来越广泛的关注[1]。由于大跨度桥梁风致振动机理的复杂性,在进行桥梁抗风性能研究时,通常需要借助风洞试验对桥梁进行抗风性能测试。尤其在初步设计阶段,需要借助节段模型风洞试

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