首页|新型铝合金人行天桥结构的受力特性分析

新型铝合金人行天桥结构的受力特性分析

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在铝合金承载桥梁应用较不广泛的现在,以福州首座铝合金人行天桥为背景,建立桥梁有限元模型,通过多种工况下的受力情况分析,探究新型铝合金天桥的结构受力特性.结果表明:该结构在严格控制加工、施工质量后,结构整体受力满足规范要求;在多种工况下,结构主跨跨中处上下弦杆轴力大,相比跨度小的边跨跨中处上下弦杆轴力大百分之30左右;同时该结构在多种工况下支座处下弦杆弯矩值较其他位置处大,后期设计中应予以重视.在结构受多种工况下,结构位移最大仅为13.4mm,满足规范要求,同时因荷载变化,结构各处位移也均有不同程度变化.结构在现有恒荷载以及多种活载分布情况下的结构安全系数均大于规范规定值,满足安全要求.
Analysis of mechanical characteristics of a new aluminum alloy pedestrian bridge structure
At present,the aluminum alloy bearing bridge is not widely used,taking the first aluminum alloy footbridge in Fuzhou as the back-ground,the finite element model of the bridge is established,and the structural stress characteristics of the new aluminum alloy footbridge are explored through the analysis of the stress conditions under various working conditions.The results show that the overall force of the structure can meet the standard requirements after the quality of machining and construction is strictly controlled.In a variety of working conditions,the axial force of the upper and lower chords at the middle span of the main span of the structure is larger than that at the middle span of the side span with small span is about 30 percent larger.At the same time,the bending moment of the lower chord at the support of the structure is larger than that at other positions under various working conditions,which should be paid more attention to in the later de-sign.When the structure is subjected to a variety of working conditions,the maximum displacement of the structure is only 13.4mm,which meets the requirements of the specification.At the same time,the displacement of the structure varies with different degrees when the load changes.The safety factor of the structure under the existing constant load and various live load distributions is greater than the specified value,which meets the safety requirements.

aluminum alloy overpassload actionnew structureforce characteristics

林志滔

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福州市规划设计研究院集团有限公司 福建福州 350108

铝合金天桥 荷载作用 新型结构 受力特性

2024

福建建设科技
福建省建设厅科技情报中心站 福建省建筑科学研究院

福建建设科技

影响因子:0.5
ISSN:1006-3943
年,卷(期):2024.(2)
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