基于控制变量法的钢混凝土组合桥结构参数分析

Structural Parameter Analysis of Steel-concrete Composite Bridge Based on Control Variable Method

为研究钢混凝土组合桥结构参数对受力性能的影响规律,利用有限元软件建立钢混凝土组合桥面板节段有限元模型,基于控制变量法进行钢混凝土组合桥面板参数性研究分析,分别研究钢面板厚度、混凝土面板厚度以及剪力钉间距对钢面板跨中应力和支点应力、混凝土面板跨中应力和支点应力以及跨中挠度的影响规律。结果表明,随着混凝土面板厚度和钢面板厚度的增加,钢混凝土组合桥面板结构各项力学性能指标均呈现减小的趋势,而随着剪力钉间距的增加,结构各项力学性能指标也增加,三个参数影响程度最大的为混凝土面板厚度,最大影响程度分别为钢面板和剪力钉间距的38.01%和35.50%,因此在类似结构设计时可以着重关注混凝土板厚度参数的改变,确保结构受力性能良好。

In order to study the influence rule of structural parameters of steel-concrete composite bridge on mechanical performance,the finite element software was used to establish the segment finite element model of steel-concrete composite bridge panel.Based on the control variable method,the parametric analysis of steel-concrete composite bridge panel was carried out,and the thickness of steel panel was studied respectively.Effects of concrete panel thickness and shear nail spacing on mid-span stress and fulcrum stress of steel panel,mid-span stress and fulcrum stress of concrete panel and mid-span deflection.The results show that with the increase of the thickness of the concrete panel and the thickness of the steel panel,the mechanical properties of the steel concrete composite bridge panel structure tend to decrease,and with the increase of the distance between shear nails,the mechanical properties of the structure also increase.The three parameters have the greatest influence on the thickness of the concrete panel.The maximum influence degree is 38.01%and 35.50%of the distance between steel panel and shear nails,respectively.Therefore,in the design of similar structures,we can pay more attention to the change of the thickness parameters of concrete slab to ensure the good mechanical performance of the structure.