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威尼斯大运河上的第4座桥——威尼斯四桥是一座主跨80.8m的钢拱人行桥,采用π形截面桁架拱肋,矢跨比1/16。为了研究其受力特点,采用有限元软件建立威尼斯四桥的计算模型,分析该桥在自重及人行荷载下的静力性能,并在该桥基本动力模态的基础上,进行人行舒适度评价和抗震性能分析。分析结果表明:该桥采用了1/16的小矢跨比,水平推力大,对基础受力不利;π形连接钢板不仅要承受主拱的剪力,还要承受局部弯矩,其某些部分的应力达到了临界状态;主拱肋刚度偏小,在不对称荷载作用下,弯曲变形较大;人行舒适度能够满足要求;地震作用下横向弯矩较大。
The fourth bridge on the Grand Canal in Venice - the four bridges in Venice is a steel arch bridge with a main span of 80.8m, with a π-shaped cross-section truss arch rib with a ratio of 1/16 to the sag. In order to study the characteristics of its force, the finite element software is used to establish the calculation model of the four bridges in Venice. The static performance of the bridge under its own weight and pedestrian load is analyzed. Based on the basic dynamic model of the bridge, And seismic performance analysis. The results show that the bridge has a small ratio of 1/16, the horizontal thrust is large, which is unfavorable to the foundation. The π-shaped connecting steel plate not only has to bear the shear force of the main arch but also bear the local bending moment. Part of the stress reached a critical state; the main arch rib rigidity is small, under asymmetric load, bending larger; pedestrian comfort to meet the requirements;